Compilare: main.cpp:17:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 17 | main(){ | ^~~~ main.cpp: In function 'int main()': main.cpp:32:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int id=0;id<a[x].size();id++){ | ~~^~~~~~~~~~~~ main.cpp:40:32: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(int id=0;id<a[y].size();id++){ | ~~^~~~~~~~~~~~