Compilare: main.cpp: In function 'long long int findJustFriends(int, std::vector<int>&, long long int)': main.cpp:59:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = stoppedIteration; i < children.size() && enemies.size() > enemiesMax; ++i ) { ~~^~~~~~~~~~~~~~~~~ main.cpp:59:72: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = stoppedIteration; i < children.size() && enemies.size() > enemiesMax; ++i ) { ~~~~~~~~~~~~~~~^~~~~~~~~~~~ main.cpp: In function 'long long int findRestOfChildren(std::vector<int>&, long long int)': main.cpp:76:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < children.size() && takenChildrenCount < s; ++i ) { ~~^~~~~~~~~~~~~~~~~ main.cpp:82:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] } else if ( enemies.size() < enemiesMax ) { ~~~~~~~~~~~~~~~^~~~~~~~~~~~ main.cpp: In function 'long long int solve()': main.cpp:101:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < children.size(); ++i ) { ~~^~~~~~~~~~~~~~~~~ main.cpp:110:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( friends.size() == friendsMin ) { ~~~~~~~~~~~~~~~^~~~~~~~~~~~~