#include <iostream> #include <vector> using namespace std; vector<vector<int>> month {{31,28,31,30,31,30,31,31,30,31,30,31}, {31,29,31,30,31,30,31,31,30,31,30,31}}; bool isLeap(int year){ return (year%4==0&&year%100!=0)||year%400==0; } int main() { int y,m,d; w...