#include <stdio.h> int is_years(int y) { if (y % 4 == 0 && y % 100 != 0) { return 1; } if (y % 400 == 0) { return 1; } return 0; } int main() { int y = 0; int m = 0; int d = 0; int ret = 0; int days[13] = {0,31,0,31,30,31,30,31,31,30,31,30,31}; while (scanf("%d %d %d", &y...