题解 CF44B 【Cola】

这题是个暴力题目，挺水

代码来了，2重循环，1.06s

#include <cstdio>

inline int read()//快读
{
    int x = 0;
    char ch = getchar();
    while(ch >= '0' && ch <= '9')
    {
        x = (x << 1) + (x << 3) + (ch ^ 48);
        ch = getchar();
    }
    return x;
}

#define min(x, y) (x < y ? x : y)//宏定义

int main()
{
    int n, a, b, c, ans = 0;
    n = read();
    a = read();
    b = read();
    c = read();
    for(register int i = 0; i <= min(n / 2, c); i++)
    {
        for(register int j = 0; j <= min(n, b); j++)
        {
            if((n - i * 2 - j) * 2 <= a && n - i * 2 - j >= 0)
            {
                ans++;
            }
        }
    }
    printf("%d\n", ans);
    return 0;
}