HDU 4839 The Game of Coins _(:зゝ∠)_

The Game of Coins

mark：

#include"cstdio"
#include"iostream"
#include"queue"
#include"algorithm"
#include"set"
#include"queue"
#include"cmath"
#include"string.h"
#include"vector"
using namespace std; 

#define ll __int64
inline ll abs(ll x){return x>0?x:-x;}
ll gcd(ll a,ll b){if(a>b)swap(a,b);    while(a){    b%=a;swap(a,b);    }return b;}

int main() {
    ll T, i, j;scanf("%I64d", &T);
    for(ll t = 1; t <= T; t++){
        char a[1005], b[1005];
        scanf("%s %s", a, b);
        printf("Case #%I64d:\n", t);
        ll len = strlen(a);
        ll ga = 0, fa = 0, gb = 0, fb = 0;
        for (i = 1; i<=len; i++)
        {
            if (strncmp(a, a+len-i, i) == 0) ga |= (ll)1 << i;
            if (strncmp(a, b+len-i, i) == 0) fa |= (ll)1 << i;
            if (strncmp(b, a+len-i, i) == 0) gb |= (ll)1 << i;
            if (strncmp(b, b+len-i, i) == 0) fb |= (ll)1 << i;
        }
        ll dou1 = abs(ga - gb);
        ll dou2 = abs(fb - fa);

        if (dou1 == dou2) { puts("1/2"); continue; }
        if (dou1 == 0) { puts("1"); continue; }
        if (dou2 == 0) { puts("0"); continue; }
        ll GCD = gcd(dou1, dou2);
        dou1 /= GCD;    dou2 /= GCD;
        printf("%I64d/%I64d\n", dou2, dou1+dou2);
    }
    return 0;
}