HackerEarth's basic programming solutions( Ali and Helping innocent people, Duration, Book of Potion making ) :
Problem 21: Ali and Helping innocent people Solution: (in c++) ( please guys before moving to the solution try it yourself at least 3-4 times , if you really wanna become a good coder) #include< bits/stdc++.h > using namespace std ; int main () { int count ; string s ; cin >> s ; if (((( s [ 0 ]- '0' )+( s [ 1 ]- '0' ))% 2 == 0 )&&((( s [ 3 ]- '0' )+( s [ 4 ]- '0' ))% 2 == 0 )&&((( s [ 4 ]- '0' )+ ( s [ 5 ]- '0' ))% 2 == 0 )&&((( s [ 7 ]- '0' )+( s [ 8 ]- '0' ))% 2 == 0 )&&( s [ 2 ]!= 'A' ) && ( s [ 2 ]!= 'E' ) && ( s [ 2 ]!= 'I' ) && ( s [ 2 ]!= 'O' ) && ( s [ 2 ]!= 'U' ) && ( s [ 2 ]!= 'Y' ) ) { cout << "valid" << endl ; } else { cout << "invalid" <<