1 1
0

1 50000
5130

50000 1
2

19 40320
4204

p.s. why time limitation is 2sec? it can be solved very fast using Lucas theorem.

Edited by author 16.12.2011 12:47

What is in 5th test???
my program seems to be right

#include<stdio.h>
 #include<conio.h>


long int i,j,n,m,aa,bb,cc,lap,k,l;
int a[50001],sont;
int dem[50001];
long int kq;

void InitPrime();
long int Max(long int x,long int y);
long int Min(long int x,long int y);
void InitDem();
void Test();

int main()
{
    scanf("%ld %ld",&n,&m);
    aa=Max(n,m);
    bb=Min(n,m);
    cc=aa-bb;

    InitDem();
    InitPrime();
 //   Test();

    lap=Max(bb,cc);
    i=lap+1;
    // tinh so nguyen to o tren tu
    while(i<=aa)
    {
           k=0;
           l=i;
           while(l!=1)
           {
            k++;
            while((l%a[k])==0)
            {
             l=l/a[k];
             dem[a[k]]++;
            }
           }
           i++;
    }

    // tinh so nguyen to duoi mau
    lap=Min(bb,cc);
    i=2;
    // tinh so nguyen to o tren tu
    while(i<=lap)
    {
           k=0;
           l=i;
           while(l!=1)
           {
            k++;
            while((l%a[k])==0)
            {
             l=l/a[k];
             dem[a[k]]--;
            }
           }
           i++;
    }

    //dem ket qua
    kq=0;
    i=2;
    while(i<=aa)
    {
     if(dem[i]!=0) kq+=dem[i];
     i++;
    }
    printf("%ld",kq);

    getch();
    return 0;
}

void InitDem()
{
 i=1;
 while(i<=aa)
 {
  dem[i]=0;
  i++;
 }
}

long int Max(long int x,long int y)
{
 if(x<=y) return y;
 return x;
}

long int Min(long int x,long int y)
{
 if(x<=y) return x;
 return y;
}

void InitPrime()
{
     int flag;
     long int x;
     a[1]=2;
     a[2]=3;
     a[3]=5;
     a[4]=7;
     i=4;
     x=11;
     while(x<aa+1)
     {
                   j=2;
                   flag=1;
                   while(j*j<x)
                   {
                    if(x%j==0)
                    {
                     flag=0;
                     break;
                    }
                    j++;
                   }
                   if(flag==1)
                   {
                     a[++i]=x;
                   }
                   x+=2;
     }
     sont=i;
}
void Test()
{
 for(i=1;i<=sont;i++) printf("%d\n",a[i]);
// getch();
}

who have AC - please give tests.

help~! >0<

#include<iostream>
using namespace std;
int a[50000],b[50000],k=0,z=0;
void pra(int f){
     int i;

     for(i=2;i<=f;i++){
                   while(f%i==0){ f/=i; a[k]=i; k++; }
                   }
                   }
void prb(int a){
     int i;
     for(i=2;i<=a;i++){
                   while(a%i==0){ a/=i; b[z]=i; z++; }
                   }
                   }
int main(){
    int n,m,i,j,br=0;
    cin>>n>>m;
    for(i=n-m+1;i<=n;i++)
    pra(i);
    for(i=2;i<=m;i++)
    prb(i);
    sort(a,a+k);
    sort(b,b+z);
    for(i=0;i<50000;i++){
                     for(j=0;j<50000;j++){
                                      if(a[i]==b[j]){ a[i]=0; b[j]=0; break; }
                                      }
                     }
                     for(i=0;i<50000;i++){ if(a[i]) br++; }
                     cout<<br<<endl;
                     system("pause");
                     return 0;
                     }


This is my sourse and it works for some of the tests, but not for the all! So i have a problem on test 2. Can you tell me what to edit? 10x

Can someone help me? With this source it is working for 2.031. How can I improve it?
#include<iostream>
using namespace std;
long long nod(long long a,int b){
 while(a!=0&&b!=0){
  if(a>b) a%=b;
  else b%=a;
 }
  return a+b;
 }
int main()

{
 long long  last[50000];
int n,k,i,j,l,br=0;
 cin>>n>>k;
 last[0]=1;
 for(i=0;i<=n;i++)
 {
  last[i]=1;
  for(j=i-1;j>0;j--)last[j]=last[j]+last[j-1];
 }
//cout<<last[k]<<endl;
 for(l=2;l<last[k];l++){
  if(nod(last[k],l)!=1) br++;
  while(last[k]%l==0)last[k]/=l;

 }
 cout<<br<<endl;
//system("pause");
 return 0;
}

For example :
N = 7 and M = 3
you see : 7!/(3!*4!) = (2*3*4*5*6*7)/(2*3*2*3*4) = (5*6*7)/(2*3) = 35
=> you need not to calculate the multiple but divide all numbers into prime
I assign : the left = (5*6*7), the right = (2*3)
after division the left :
5 = 5
6 = 2*3
7 = 7
you will count all prime, the result is following :
there are 1 primes with value of 2
there are 1 primes with value of 3
there are 1 primes with value of 5
there are 1 primes with value of 7
I put into the bracket (1,1,1,1)
after divison the right :
2 = 2
3 = 3
there are 1 primes with value of 2
there are 1 primes with value of 3
there are 0 primes with value of 5
there are 0 primes with value of 7
I put into the bracket (1,1,0,0)
the left - the right = (1,1,1,1) - (1,1,0,0) = (0,0,1,1)
and the result 0+0+1+1 = 2
2 is the result
GOOD LUCK !

#include <iostream.h>
int main()
{int N,M,C=1,a[50000],b[50000],c[50000],d[50000],j=0,k,s=0,i;
cin>>N>>M;
for(i=1; i<=N; i++) a[i]=i;
for(i=1; i<=M; i++) b[i]=i;
for(i=1; i<=(N-M); i++) c[i]=i;
for(i=M+1; i<=N; i++) b[i]=1;
for(i=N-M+1; i<=N; i++) c[i]=1;
for(i=1; i<=N; i++) C*=a[i]/(b[i]*c[i]);
for(i=2; i<=C/2; i++)
if(C%i==0) d[j++]=i;
for(i=0; i<=j; i++)
for(k=2; k<=d[i]/2; k++)
if(d[i]%k==0) continue;
else s++;
cout<<s; return 0; }

#include <iostream.h>
int f(int);
void main()
{int N,M,C,i,s=0;
cin>>N>>M;
C=(f(N))/(f(M)*f(N-M));
for(i=2;i<=C/2;i++) if(C%i==0) s++; cout<<s;}
int f(int x)
{int i,p=1;
for(i=1;i<=x;i++) p*=i;
 return p;}

#include<iostream>
using namespace std;
int primes[]=
{
2,
3,
5,
7,
11,
13,
17,
19,
23,
29,
31,
37,
41,
43,
47,
53,
59,
61,
67,
71,
73,
79,
83,
89,
97,
101,
103,
107,
109,
113,
127,
131,
137,
139,
149,
151,
157,
163,
167,
173,
179,
181,
191,
193,
197,
199,
211,
223,
227,
229,
233,
239,
241,
251,
257,
263,
269,
271,
277,
281,
283,
293,
307,
311,
313,
317,
331,
337,
347,
349,
353,
359,
367,
373,
379,
383,
389,
397,
401,
409,
419,
421,
431,
433,
439,
443,
449,
457,
461,
463,
467,
479,
487,
491,
499,
503,
509,
521,
523,
541,
547,
557,
563,
569,
571,
577,
587,
593,
599,
601,
607,
613,
617,
619,
631,
641,
643,
647,
653,
659,
661,
673,
677,
683,
691,
701,
709,
719,
727,
733,
739,
743,
751,
757,
761,
769,
773,
787,
797,
809,
811,
821,
823,
827,
829,
839,
853,
857,
859,
863,
877,
881,
883,
887,
907,
911,
919,
929,
937,
941,
947,
953,
967,
971,
977,
983,
991,
997,
1009,
1013,
1019,
1021,
1031,
1033,
1039,
1049,
1051,
1061,
1063,
1069,
1087,
1091,
1093,
1097,
1103,
1109,
1117,
1123,
1129,
1151,
1153,
1163,
1171,
1181,
1187,
1193,
1201,
1213,
1217,
1223,
1229,
1231,
1237,
1249,
1259,
1277,
1279,
1283,
1289,
1291,
1297,
1301,
1303,
1307,
1319,
1321,
1327,
1361,
1367,
1373,
1381,
1399,
1409,
1423,
1427,
1429,
1433,
1439,
1447,
1451,
1453,
1459,
1471,
1481,
1483,
1487,
1489,
1493,
1499,
1511,
1523,
1531,
1543,
1549,
1553,
1559,
1567,
1571,
1579,
1583,
1597,
1601,
1607,
1609,
1613,
1619,
1621,
1627,
1637,
1657,
1663,
1667,
1669,
1693,
1697,
1699,
1709,
1721,
1723,
1733,
1741,
1747,
1753,
1759,
1777,
1783,
1787,
1789,
1801,
1811,
1823,
1831,
1847,
1861,
1867,
1871,
1873,
1877,
1879,
1889,
1901,
1907,
1913,
1931,
1933,
1949,
1951,
1973,
1979,
1987,
1993,
1997,
1999,
2003,
2011,
2017,
2027,
2029,
2039,
2053,
2063,
2069,
2081,
2083,
2087,
2089,
2099,
2111,
2113,
2129,
2131,
2137,
2141,
2143,
2153,
2161,
2179,
2203,
2207,
2213,
2221,
2237,
2239,
2243,
2251,
2267,
2269,
2273,
2281,
2287,
2293,
2297,
2309,
2311,
2333,
2339,
2341,
2347,
2351,
2357,
2371,
2377,
2381,
2383,
2389,
2393,
2399,
2411,
2417,
2423,
2437,
2441,
2447,
2459,
2467,
2473,
2477,
2503,
2521,
2531,
2539,
2543,
2549,
2551,
2557,
2579,
2591,
2593,
2609,
2617,
2621,
2633,
2647,
2657,
2659,
2663,
2671,
2677,
2683,
2687,
2689,
2693,
2699,
2707,
2711,
2713,
2719,
2729,
2731,
2741,
2749,
2753,
2767,
2777,
2789,
2791,
2797,
2801,
2803,
2819,
2833,
2837,
2843,
2851,
2857,
2861,
2879,
2887,
2897,
2903,
2909,
2917,
2927,
2939,
2953,
2957,
2963,
2969,
2971,
2999,
3001,
3011,
3019,
3023,
3037,
3041,
3049,
3061,
3067,
3079,
3083,
3089,
3109,
3119,
3121,
3137,
3163,
3167,
3169,
3181,
3187,
3191,
3203,
3209,
3217,
3221,
3229,
3251,
3253,
3257,
3259,
3271,
3299,
3301,
3307,
3313,
3319,
3323,
3329,
3331,
3343,
3347,
3359,
3361,
3371,
3373,
3389,
3391,
3407,
3413,
3433,
3449,
3457,
3461,
3463,
3467,
3469,
3491,
3499,
3511,
3517,
3527,
3529,
3533,
3539,
3541,
3547,
3557,
3559,
3571,
3581,
3583,
3593,
3607,
3613,
3617,
3623,
3631,
3637,
3643,
3659,
3671,
3673,
3677,
3691,
3697,
3701,
3709,
3719,
3727,
3733,
3739,
3761,
3767,
3769,
3779,
3793,
3797,
3803,
3821,
3823,
3833,
3847,
3851,
3853,
3863,
3877,
3881,
3889,
3907,
3911,
3917,
3919,
3923,
3929,
3931,
3943,
3947,
3967,
3989,
4001,
4003,
4007,
4013,
4019,
4021,
4027,
4049,
4051,
4057,
4073,
4079,
4091,
4093,
4099,
4111,
4127,
4129,
4133,
4139,
4153,
4157,
4159,
4177,
4201,
4211,
4217,
4219,
4229,
4231,
4241,
4243,
4253,
4259,
4261,
4271,
4273,
4283,
4289,
4297,
4327,
4337,
4339,
4349,
4357,
4363,
4373,
4391,
4397,
4409,
4421,
4423,
4441,
4447,
4451,
4457,
4463,
4481,
4483,
4493,
4507,
4513,
4517,
4519,
4523,
4547,
4549,
4561,
4567,
4583,
4591,
4597,
4603,
4621,
4637,
4639,
4643,
4649,
4651,
4657,
4663,
4673,
4679,
4691,
4703,
4721,
4723,
4729,
4733,
4751,
4759,
4783,
4787,
4789,
4793,
4799,
4801,
4813,
4817,
4831,
4861,
4871,
4877,
4889,
4903,
4909,
4919,
4931,
4933,
4937,
4943,
4951,
4957,
4967,
4969,
4973,
4987,
4993,
4999,
5003,
5009,
5011,
5021,
5023,
5039,
5051,
5059,
5077,
5081,
5087,
5099,
5101,
5107,
5113,
5119,
5147,
5153,
5167,
5171,
5179,
5189,
5197,
5209,
5227,
5231,
5233,
5237,
5261,
5273,
5279,
5281,
5297,
5303,
5309,
5323,
5333,
5347,
5351,
5381,
5387,
5393,
5399,
5407,
5413,
5417,
5419,
5431,
5437,
5441,
5443,
5449,
5471,
5477,
5479,
5483,
5501,
5503,
5507,
5519,
5521,
5527,
5531,
5557,
5563,
5569,
5573,
5581,
5591,
5623,
5639,
5641,
5647,
5651,
5653,
5657,
5659,
5669,
5683,
5689,
5693,
5701,
5711,
5717,
5737,
5741,
5743,
5749,
5779,
5783,
5791,
5801,
5807,
5813,
5821,
5827,
5839,
5843,
5849,
5851,
5857,
5861,
5867,
5869,
5879,
5881,
5897,
5903,
5923,
5927,
5939,
5953,
5981,
5987,
6007,
6011,
6029,
6037,
6043,
6047,
6053,
6067,
6073,
6079,
6089,
6091,
6101,
6113,
6121,
6131,
6133,
6143,
6151,
6163,
6173,
6197,
6199,
6203,
6211,
6217,
6221,
6229,
6247,
6257,
6263,
6269,
6271,
6277,
6287,
6299,
6301,
6311,
6317,
6323,
6329,
6337,
6343,
6353,
6359,
6361,
6367,
6373,
6379,
6389,
6397,
6421,
6427,
6449,
6451,
6469,
6473,
6481,
6491,
6521,
6529,
6547,
6551,
6553,
6563,
6569,
6571,
6577,
6581,
6599,
6607,
6619,
6637,
6653,
6659,
6661,
6673,
6679,
6689,
6691,
6701,
6703,
6709,
6719,
6733,
6737,
6761,
6763,
6779,
6781,
6791,
6793,
6803,
6823,
6827,
6829,
6833,
6841,
6857,
6863,
6869,
6871,
6883,
6899,
6907,
6911,
6917,
6947,
6949,
6959,
6961,
6967,
6971,
6977,
6983,
6991,
6997,
7001,
7013,
7019,
7027,
7039,
7043,
7057,
7069,
7079,
7103,
7109,
7121,
7127,
7129,
7151,
7159,
7177,
7187,
7193,
7207,
7211,
7213,
7219,
7229,
7237,
7243,
7247,
7253,
7283,
7297,
7307,
7309,
7321,
7331,
7333,
7349,
7351,
7369,
7393,
7411,
7417,
7433,
7451,
7457,
7459,
7477,
7481,
7487,
7489,
7499,
7507,
7517,
7523,
7529,
7537,
7541,
7547,
7549,
7559,
7561,
7573,
7577,
7583,
7589,
7591,
7603,
7607,
7621,
7639,
7643,
7649,
7669,
7673,
7681,
7687,
7691,
7699,
7703,
7717,
7723,
7727,
7741,
7753,
7757,
7759,
7789,
7793,
7817,
7823,
7829,
7841,
7853,
7867,
7873,
7877,
7879,
7883,
7901,
7907,
7919,
7927,
7933,
7937,
7949,
7951,
7963,
7993,
8009,
8011,
8017,
8039,
8053,
8059,
8069,
8081,
8087,
8089,
8093,
8101,
8111,
8117,
8123,
8147,
8161,
8167,
8171,
8179,
8191,
8209,
8219,
8221,
8231,
8233,
8237,
8243,
8263,
8269,
8273,
8287,
8291,
8293,
8297,
8311,
8317,
8329,
8353,
8363,
8369,
8377,
8387,
8389,
8419,
8423,
8429,
8431,
8443,
8447,
8461,
8467,
8501,
8513,
8521,
8527,
8537,
8539,
8543,
8563,
8573,
8581,
8597,
8599,
8609,
8623,
8627,
8629,
8641,
8647,
8663,
8669,
8677,
8681,
8689,
8693,
8699,
8707,
8713,
8719,
8731,
8737,
8741,
8747,
8753,
8761,
8779,
8783,
8803,
8807,
8819,
8821,
8831,
8837,
8839,
8849,
8861,
8863,
8867,
8887,
8893,
8923,
8929,
8933,
8941,
8951,
8963,
8969,
8971,
8999,
9001,
9007,
9011,
9013,
9029,
9041,
9043,
9049,
9059,
9067,
9091,
9103,
9109,
9127,
9133,
9137,
9151,
9157,
9161,
9173,
9181,
9187,
9199,
9203,
9209,
9221,
9227,
9239,
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42227,
42239,
42257,
42281,
42283,
42293,
42299,
42307,
42323,
42331,
42337,
42349,
42359,
42373,
42379,
42391,
42397,
42403,
42407,
42409,
42433,
42437,
42443,
42451,
42457,
42461,
42463,
42467,
42473,
42487,
42491,
42499,
42509,
42533,
42557,
42569,
42571,
42577,
42589,
42611,
42641,
42643,
42649,
42667,
42677,
42683,
42689,
42697,
42701,
42703,
42709,
42719,
42727,
42737,
42743,
42751,
42767,
42773,
42787,
42793,
42797,
42821,
42829,
42839,
42841,
42853,
42859,
42863,
42899,
42901,
42923,
42929,
42937,
42943,
42953,
42961,
42967,
42979,
42989,
43003,
43013,
43019,
43037,
43049,
43051,
43063,
43067,
43093,
43103,
43117,
43133,
43151,
43159,
43177,
43189,
43201,
43207,
43223,
43237,
43261,
43271,
43283,
43291,
43313,
43319,
43321,
43331,
43391,
43397,
43399,
43403,
43411,
43427,
43441,
43451,
43457,
43481,
43487,
43499,
43517,
43541,
43543,
43573,
43577,
43579,
43591,
43597,
43607,
43609,
43613,
43627,
43633,
43649,
43651,
43661,
43669,
43691,
43711,
43717,
43721,
43753,
43759,
43777,
43781,
43783,
43787,
43789,
43793,
43801,
43853,
43867,
43889,
43891,
43913,
43933,
43943,
43951,
43961,
43963,
43969,
43973,
43987,
43991,
43997,
44017,
44021,
44027,
44029,
44041,
44053,
44059,
44071,
44087,
44089,
44101,
44111,
44119,
44123,
44129,
44131,
44159,
44171,
44179,
44189,
44201,
44203,
44207,
44221,
44249,
44257,
44263,
44267,
44269,
44273,
44279,
44281,
44293,
44351,
44357,
44371,
44381,
44383,
44389,
44417,
44449,
44453,
44483,
44491,
44497,
44501,
44507,
44519,
44531,
44533,
44537,
44543,
44549,
44563,
44579,
44587,
44617,
44621,
44623,
44633,
44641,
44647,
44651,
44657,
44683,
44687,
44699,
44701,
44711,
44729,
44741,
44753,
44771,
44773,
44777,
44789,
44797,
44809,
44819,
44839,
44843,
44851,
44867,
44879,
44887,
44893,
44909,
44917,
44927,
44939,
44953,
44959,
44963,
44971,
44983,
44987,
45007,
45013,
45053,
45061,
45077,
45083,
45119,
45121,
45127,
45131,
45137,
45139,
45161,
45179,
45181,
45191,
45197,
45233,
45247,
45259,
45263,
45281,
45289,
45293,
45307,
45317,
45319,
45329,
45337,
45341,
45343,
45361,
45377,
45389,
45403,
45413,
45427,
45433,
45439,
45481,
45491,
45497,
45503,
45523,
45533,
45541,
45553,
45557,
45569,
45587,
45589,
45599,
45613,
45631,
45641,
45659,
45667,
45673,
45677,
45691,
45697,
45707,
45737,
45751,
45757,
45763,
45767,
45779,
45817,
45821,
45823,
45827,
45833,
45841,
45853,
45863,
45869,
45887,
45893,
45943,
45949,
45953,
45959,
45971,
45979,
45989,
46021,
46027,
46049,
46051,
46061,
46073,
46091,
46093,
46099,
46103,
46133,
46141,
46147,
46153,
46171,
46181,
46183,
46187,
46199,
46219,
46229,
46237,
46261,
46271,
46273,
46279,
46301,
46307,
46309,
46327,
46337,
46349,
46351,
46381,
46399,
46411,
46439,
46441,
46447,
46451,
46457,
46471,
46477,
46489,
46499,
46507,
46511,
46523,
46549,
46559,
46567,
46573,
46589,
46591,
46601,
46619,
46633,
46639,
46643,
46649,
46663,
46679,
46681,
46687,
46691,
46703,
46723,
46727,
46747,
46751,
46757,
46769,
46771,
46807,
46811,
46817,
46819,
46829,
46831,
46853,
46861,
46867,
46877,
46889,
46901,
46919,
46933,
46957,
46993,
46997,
47017,
47041,
47051,
47057,
47059,
47087,
47093,
47111,
47119,
47123,
47129,
47137,
47143,
47147,
47149,
47161,
47189,
47207,
47221,
47237,
47251,
47269,
47279,
47287,
47293,
47297,
47303,
47309,
47317,
47339,
47351,
47353,
47363,
47381,
47387,
47389,
47407,
47417,
47419,
47431,
47441,
47459,
47491,
47497,
47501,
47507,
47513,
47521,
47527,
47533,
47543,
47563,
47569,
47581,
47591,
47599,
47609,
47623,
47629,
47639,
47653,
47657,
47659,
47681,
47699,
47701,
47711,
47713,
47717,
47737,
47741,
47743,
47777,
47779,
47791,
47797,
47807,
47809,
47819,
47837,
47843,
47857,
47869,
47881,
47903,
47911,
47917,
47933,
47939,
47947,
47951,
47963,
47969,
47977,
47981,
48017,
48023,
48029,
48049,
48073,
48079,
48091,
48109,
48119,
48121,
48131,
48157,
48163,
48179,
48187,
48193,
48197,
48221,
48239,
48247,
48259,
48271,
48281,
48299,
48311,
48313,
48337,
48341,
48353,
48371,
48383,
48397,
48407,
48409,
48413,
48437,
48449,
48463,
48473,
48479,
48481,
48487,
48491,
48497,
48523,
48527,
48533,
48539,
48541,
48563,
48571,
48589,
48593,
48611,
48619,
48623,
48647,
48649,
48661,
48673,
48677,
48679,
48731,
48733,
48751,
48757,
48761,
48767,
48779,
48781,
48787,
48799,
48809,
48817,
48821,
48823,
48847,
48857,
48859,
48869,
48871,
48883,
48889,
48907,
48947,
48953,
48973,
48989,
48991,
49003,
49009,
49019,
49031,
49033,
49037,
49043,
49057,
49069,
49081,
49103,
49109,
49117,
49121,
49123,
49139,
49157,
49169,
49171,
49177,
49193,
49199,
49201,
49207,
49211,
49223,
49253,
49261,
49277,
49279,
49297,
49307,
49331,
49333,
49339,
49363,
49367,
49369,
49391,
49393,
49409,
49411,
49417,
49429,
49433,
49451,
49459,
49463,
49477,
49481,
49499,
49523,
49529,
49531,
49537,
49547,
49549,
49559,
49597,
49603,
49613,
49627,
49633,
49639,
49663,
49667,
49669,
49681,
49697,
49711,
49727,
49739,
49741,
49747,
49757,
49783,
49787,
49789,
49801,
49807,
49811,
49823,
49831,
49843,
49853,
49871,
49877,
49891,
49919,
49921,
49927,
49937,
49939,
49943,
49957,
49991,
49993,
49999
};
int fact[50000];
int main () {
int n,m;
cin>>n>>m;
int a=max(n,m);
int b=min(n,m);
int c=a-b;
for (int i=max(b,c)+1;i<=a;i++) {
int j=-1;
int d=i;
while (d!=1) {
      j++;
      while (d%primes[j]==0) {d/=primes[j];fact[primes[j]]++;}
           }
}
for (int i=2;i<=min(c,b);i++) {
    int j=-1;
    int d=i;
    while (d!=1) {
      j++;
      while (d%primes[j]==0) {d/=primes[j];fact[primes[j]]--;}
      }
}
     int  br=0;
    for (int i=0;i<50000;i++) if (fact[i]) br++;
    cout<<br<<endl;
return 0;
}

uses crt;
var
x:longint;
temp,bolen,i,j,n,k:integer;
sad,a,b:array [1..100] of integer;
begin
clrscr;
readln(n,k);
    for i:=1 to n do
    a[i]:=i;
    for i:=1 to k do
    b[i]:=i;
    for i:=1 to n-k do
    b[k+i]:=i;
  for i:=2 to n do
  begin
  for j:=2 to n do
  begin
  if a[i] mod b[j]=0 then
  begin
  a[i]:=a[i] div b[j];
  b[j]:=1;
  end;
  if b[j] mod a[i]=0 then
  begin
  b[j]:=B[J] div a[i] ;
  a[i]:=1;
  end;
  end;
  end;
x:=1;
for i:=1 to n do
x:=x*a[i];
     bolen:=1;
     repeat
     temp:=0;
     if x mod bolen=0 then
     begin
     x:=x div bolen;
     inc(j);
     sad[j]:=bolen;
     end
     else bolen:=bolen+1;
     until x=1;
     for i:=1 to j do
     writeln(sad[i]);

readln;
end.

usually I write the program mixed with c and c++
and submit as a c++ program
and no problem occurs on every site until today's
"complilation error" on this site.

~.~
There is a trick in finding divsors.
For example,the number of k divisor from 1~N is
F(N)=N div k+N div (k*k)+N div (k*k*k)......

So we can just calc F(N)-F(M)-F(N-M) for every divisor that is between 1 and N.

#include <iostream>
using namespace std;
int i,o,n,m,k,nm[50001],n_m[50001],n_n[50001],c;
bool bb[50001];
int main()
{
cin>>n>>m;
bb[1]=true;
for(i=2;i<=n;i++)
  if (!bb[i])
  for(o=2*i;o<=n;o+=i)bb[o]=true;
for(i=2;i<=n;i++)
  if (bb[i])
  {
  k=i;
  for(o=2;o<=i;o++)
  if (!bb[o])
    {
    while(k%o==0)
     {
     nm[o]++;
     k/=o;
     }
    if (k==1) break;
    }
  }
  else
  {
  nm[i]++;
  }
for(i=2;i<=m;i++)
  if (bb[i])
  {
  k=i;
  for(o=2;o<=i;o++)
  if (!bb[o])
    {
    while(k%o==0)
     {
     n_m[o]++;
     k/=o;
     }
     if (k==1) break;
    }
  }
  else
  {
  n_m[i]++;
  }
for(i=2;i<=n-m;i++)
  if (bb[i])
  {
  k=i;
  for(o=2;o<=i;o++)
  if (!bb[o])
    {
    while(k%o==0)
     {
     n_n[o]++;
     k/=o;
     }
    if (k==1) break;
    }
  }
  else
  {
  n_n[i]++;
  }
for(i=2;i<=n;i++)
  {
  nm[i]-=n_n[i]+n_m[i];
  if (nm[i]>0) c++;
  }
cout<<c;
return 0;
}

#include<stdio.h>
#include<math.h>
#include<string.h>

long n,m,p,i;
int j;
double ab;
int a[50010];

void divide1(long t)
{
     for (j=2;j<sqrt(t);j++)
     {
          while (t % j == 0)
          {
               if (a[j]==0) p++;
               a[j]++;
               t/=j;
          }
     }
     if (t>1)
       {
           if (a[t]==0) p++;
           a[t]++;
       }
}

void divide2(long t)
{
     for (j=2;j<sqrt(t);j++)
     {
         while (t % j == 0)
          {
               a[j]--;
               if (a[j]==0) p--;
               t/=j;
          }
     }
     if (t>1)
       {
           a[t]--;
           if (a[t]==0) p--;
       }

}

int main()
{
    scanf("%ld %ld", &n, &m);
    if (n - m < m) m = n-m;
    memset(a,0,sizeof(a));
    for (i=n;i>=n-m+1;i--)
    {
        divide1(i);
    }
    for (i=1;i<=m;i++)
    {
        divide2(i);
    }
    printf("%ld\n", p);
    return 0;
}

why I get crash(access violation) at test 6?
who have the test?
S.O.S!!

var
m:array[1..50000]of longint;
t,col1,col2,l,i,j,k:longint;
begin
readln(k,l);col1:=0;col2:=0;
if k<=l then
   begin
     writeln('0');
     halt;
   end;

for i:=2 to 50000 do
  begin
   t:=i;
   for j:=2 to trunc(sqrt(i)) do
       if t mod j=0 then
              begin
                m[i]:=m[t div j]+1;
                j:=trunc(sqrt(i));
              end;
   if m[i]=0 then m[i]:=1;
  end;

for i:=2 to k do inc(col1,m[i]);
for i:=2 to l do inc(col2,m[i]);
for i:=2 to k-l do inc(col2,m[i]);

writeln(col1-col2);
end.



I not understand WHY!