hdu 1110几何题

应该说是道简单的几何题，可是我推公式还是推了半天，主要就是斜着放的情况吧，刚开始推的公式不对，wa了几次。

/*

 * hdu1110/win.cpp

 * Created on: 2012-10-24

 * Author    : ben

 */

#include <cstdio>

#include <cstdlib>

#include <cstring>

#include <cmath>

#include <ctime>

#include <iostream>

#include <algorithm>

#include <queue>

#include <set>

#include <map>

#include <stack>

#include <string>

#include <vector>

#include <deque>

#include <list>

#include <functional>

#include <numeric>

#include <cctype>

using namespace std;

typedef long long LL;



bool judge(double a, double b, double x, double y) {

    if(a * b <= x * y) {

        return false;

    }

    if(x < a && y < b) {

        return true;

    }

    if(b <= y) {

        return false;

    }

    double alpha = atan(x / y);

    double z = sqrt(x * x + y * y);

    double beta = acos(b / z);

    double temp = 2 * y * sin(alpha - beta) + sqrt(z * z - b * b);

    return temp < a;

}



int main() {

#ifndef ONLINE_JUDGE

    freopen("data.in", "r", stdin);

#endif

    int T, x, y, a, b;

    scanf("%d", &T);

    while(T--) {

        scanf("%d%d%d%d", &a, &b, &x, &y);

        if(a < b) {

            swap(a, b);

        }

        if(x < y) {

            swap(x, y);

        }

        if(judge(a, b, x, y)) {

            puts("Escape is possible.");

        }else {

             puts("Box cannot be dropped.");

        }

    }

    return 0;

}