When i write my program like:
#include<cstdio>
long long int i,k;
int main(){

scanf("%lld",&k);
i=k / 3;
while(k % i!=0){
i=k /(k / i +1);
}

i got AC,but when i change it to:

#include<cstdio>

int main(){
long long int i,k;
scanf("%lld",&k);
i=k / 3;
while(k % i!=0){
i=k /(k / i +1);
}
printf("%lld",(k / i-1));
}

printf("%lld",(k / i-1));
}
i got WA5...does anyoe know how is that possible?

wtf i=k / 3; ??

If k%(l+1)==0 then 2nd have a chance to win.
And 1st wins if k%(l+1)!=0

try it: for (l=3;k%l!=0;l++);;

Edited by author 31.03.2017 14:34