codeforces 304 B. Calendar

题目链接

就是给你两个日期，让你求两个日期之间差多少天。

我先算出两个日期分别是公元多少天，然后相减得到结果。

//cf 304B//2013-06-05-18.38#include <stdio.h>#include <stdlib.h>int y, m, d;int a[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};int loop(int y){    if (y%4 == 0 && y%100 != 0 || y%400 == 0)        return 1;    return 0;}int count(){    int sum = 0;    for (int i = 1; i < y; i++)    {        sum += 365;        if (loop(i))            sum++;    }    for (int i = 1; i < m; i++)        sum += a[i];    if (loop(y) && m > 2)        sum += 1;    sum += d;    return sum;}int main(){    scanf("%d:%d:%d", &y, &m, &d);    int ans1 = count();    scanf("%d:%d:%d", &y, &m, &d);    int ans2 = count();    printf("%d\n", abs(ans2 - ans1));    return 0;}