。

分析：

原来一天天数是这样简单。。

#include 
     
      int month[13] = {
   0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};int is_leap(int n){    return ((n % 4 == 0 && n % 100 != 0) || (n % 400 == 0));}void pre(int n){    int y = 2013, m = 3, d = 24;    while(n--){        d--;        if(d == 0){            m--;            if(m < 1){                m=12;                y--;            }            month[2] = 28+is_leap(y);            d = month[m];        }    }    printf("%04d/%02d/%02d\n", y, m, d);}void next(int n){    int y = 2013, m = 3, d = 24;    while(n--){        d++;        month[2] = 28+is_leap(y);        if(d > month[m]){            d = 1;            m++;            if(m>12){                m = 1;                y++;            }        }    }    printf("%04d/%02d/%02d ", y, m, d);}int main(){    int T, n;    scanf("%d", &T);    while(T--){        scanf("%d", &n);        next(n);        pre(n);    }    return 0;}