Compilare: main.cpp: In function 'int main()': main.cpp:46:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for ( j = 0; j < pex[x].size(); j++ ) | ~~^~~~~~~~~~~~~~~ main.cpp:48:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for ( j = 0; j < pey[y].size(); j++ ) | ~~^~~~~~~~~~~~~~~ main.cpp:50:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for ( j = 0; j < pex[x].size(); j++ ) | ~~^~~~~~~~~~~~~~~