非常简洁非常妙

让y1m1d1的日期逐渐靠近目标日期

#include<stdio.h>

int main()
{
    int month[13]= {31,28,31,30,31,30,31,31,30,31,30,31};

    int cnt=0;
    int y1,y2,m1,m2,d1,d2;
    scanf("%4d%2d%2d",&y1,&m1,&d1);
    scanf("%4d%2d%2d",&y2,&m2,&d2);
    while(1)
    {
        while(y2>=y1)
        {
            if(y1%4==0&&y1%100!=0||y1%400==0)
            {
                month[1]=29;
            }
            while(m1<=12)
            {
                while(d1<=month[m1-1])
                {
                    if(y1==y2&&m1==m2&&d1==d2)
                    {
                        goto PRINT;
                        break;
                    }
                    cnt++;
                    d1++;
                }
                d1=1;
                m1++;
            }
            m1=1;
            y1++;
        }
    }
    PRINT:
        printf("%d\n",cnt+1);
    return 0;
}