#include <iostream> #include <functional> #include <iostream> using namespace std; int isPyear(int y){ return (y%4==0 && y%100!=0)||(y%400==0); } int main() { int daysEach[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}}; int d1,d2; cin&...