Codeforces Round #183 (Div. 2) B. Calendar

题目：http://codeforces.com/contest/304/problem/B
#include <iostream>
#include <stdio.h>
#include <string>
#include <string.h>
#include <algorithm>
#include <math.h>
#include <fstream>
#include <vector>
#include <map>
#include <queue>
#include <stack>
#include <math.h>
#include <stdlib.h>
#include <set>
#include <sstream>
using namespace std ;
int month[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
int leapyear(int y){
    return (!(y%4) && y%100) || (!(y%400));
}
int main(){
    int ys,ms,ds,ye,me,de;
    while(~scanf("%d:%d:%d",&ys,&ms,&ds)){
        scanf("%d:%d:%d",&ye,&me,&de);
        if(ye<ys || (ye == ys && ms>me) || (ye == ys && ms == me && ds > de)){
            swap(ys, ye);
            swap(ms, me);
            swap(ds, de);
        }
        int ans = 0;
        if(ys == ye && ms == me){
            printf("%d\n",de-ds);
            continue;
        }
        if(ys == ye){
            if(leapyear(ys) && ms == 2)
                ans += month[2]+1 - ds;
            else
                ans += month[ms] - ds;
            for(int i = ms+1;i < me;i++){
                if(leapyear(ys) && i == 2)
                    ans += month[i]+1;
                else
                    ans += month[i];
            }
            ans += de;
            printf("%d\n",ans);
            continue;
        }
        if(leapyear(ys) && ms == 2)
            ans += month[2]+1 - ds;
        else
            ans += month[ms] - ds;
        //printf("%d\n",ans);
        for(int i = ms+1;i <= 12;i++){
            if(leapyear(ys) && i == 2)
                ans += month[i]+1;
            else
                ans += month[i];
        }
        //printf("%d\n",ans);
        for(int i = ys+1;i < ye;i++){
            if(leapyear(i))
                ans += 366;
            else
                ans += 365;
        }
        //printf("%d\n",ans);
        for(int i = 1;i < me;i++){
            if(leapyear(ye) && i == 2)
                ans += month[i]+1;
            else
                ans += month[i];
        }
        //printf("%d\n",ans);
        ans += de;
        printf("%d\n",ans);
    }
    return 0;
}