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## Discussion of Problem 1017. Staircases

Is there any difference between long long and __int64?
Posted by Mato_No1 24 Jul 2010 19:57
My first code:

#include <stdio.h>
int n;
long long f[501][501], g[501][501], res;
void xxx(void)
{
for (int i=0; i<=n; i++) f[0][i] = 1;
for (int i=1; i<35 && i<=n; i++) {
for (int j=0; j<=n; j++)
for (int k=0; k<=n; k++) {
g[j][k] = f[j][k]; f[j][k] = 0;
}
for (int j=1; j<=n; j++) {
for (int k=1; k<=j; k++) f[j][k] = f[j][k - 1] + g[j - k][k - 1];
for (int k=j+1; k<=n; k++) f[j][k] = f[j][j];
}
res += f[n][n];
}
}
int main(void)
{
scanf("%d", &n);
xxx();
printf("%lld\n", --res);
return 0;
}
WA for #6.

My second code:

#include <stdio.h>
int n;
__int64 f[501][501], g[501][501], res;
void xxx(void)
{
for (int i=0; i<=n; i++) f[0][i] = 1;
for (int i=1; i<35 && i<=n; i++) {
for (int j=0; j<=n; j++)
for (int k=0; k<=n; k++) {
g[j][k] = f[j][k]; f[j][k] = 0;
}
for (int j=1; j<=n; j++) {
for (int k=1; k<=j; k++) f[j][k] = f[j][k - 1] + g[j - k][k - 1];
for (int k=j+1; k<=n; k++) f[j][k] = f[j][j];
}
res += f[n][n];
}
}
int main(void)
{
scanf("%d", &n);
xxx();
printf("%I64d\n", --res);
return 0;
}
AC.
Re: Is there any difference between long long and __int64?
Posted by goldboy 30 Aug 2010 08:36

Edited by author 30.08.2010 08:37
Re: Is there any difference between long long and __int64?
Difference only here:
printf("%lld\n", --res);
printf("%I64d\n", --res);

#include <stdio.h>
int n;
long long f[501][501], g[501][501], res;
void xxx(void)
{
for (int i=0; i<=n; i++) f[0][i] = 1;
for (int i=1; i<35 && i<=n; i++) {
for (int j=0; j<=n; j++)
for (int k=0; k<=n; k++) {
g[j][k] = f[j][k]; f[j][k] = 0;
}
for (int j=1; j<=n; j++) {
for (int k=1; k<=j; k++) f[j][k] = f[j][k - 1] + g[j - k][k - 1];
for (int k=j+1; k<=n; k++) f[j][k] = f[j][j];
}
res += f[n][n];
}
}
int main(void)
{
scanf("%d", &n);
xxx();
printf("%I64d\n", --res);
return 0;
}

This is AC.