POJ 2586

把题读明白，列上几个式子就懂了，模拟就行

#include <iostream>
#include <algorithm>
#include <cstring>
#include <vector>
#include <cmath>
using namespace std;
int main() {
    int s,d;
    int res = 0;
    while(cin >> s >> d) {
        if(d > 4 * s) res = 10 * s - 2 * d;
        else if(2 * d > 3 * s) res = 8 * s - 4 * d;
        else if(3 * d > 2 * s) res = 6 * (s - d);
        else if(4 * d > s) res = 3 * (s - 3 * d);
        else res = -1;
        if(res < 0) cout << "Deficit" << endl;
        else cout << res << endl;
    }
    return 0;
}

参考

痕迹天涯119