#include <stdio.h> int main(){ int year,month,day; int list1[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; int list2[13]={0,31,29,31,30,31,30,31,31,30,31,30,31}; while(scanf("%d %d %d",&year,&month,&day)!=EOF){ int daynum=0; if((year%4==0 && year%100 !=0) || yea...