hdu 4442 Physical Examination（水题）

坑死我了，在bnu上做的

用GNU C++一直wa，换visual c++就过了。。。

代码如下：

#include <cstdio>
#include <iostream>
#include <algorithm>
#define MAXN 100010
#define LL unsigned long long
#define MOD 31536000
using namespace std;

struct Point {
    int a, b;
}t[MAXN];

bool cmp(Point x, Point y) {
    double tmp1 = x.a*1.0/x.b;
    double tmp2 = y.a*1.0/y.b;
    return tmp1 < tmp2;
}

int main(void) {
    int n;
    LL sum, res, tmp;
    ios::sync_with_stdio(false);
    while(scanf("%d", &n) && n) {

        for(int i=0; i<n; ++i) 
            cin >> t[i].a >> t[i].b;

        sort(t, t+n, cmp);

        tmp = sum = 0;

        for(int i=0; i<n; ++i) {
            tmp = (sum*t[i].b%MOD+t[i].a%MOD)%MOD;
            sum = (sum+tmp)%MOD;
            //printf("%d -- %d\n", i, ans[i]);
        }
        cout << sum%MOD << endl;
    }
    return 0;
}