Compilare: main.cpp: In function 'int main()': main.cpp:49:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for (int j=0; j<gr[i].size(); j++) | ~^~~~~~~~~~~~~ main.cpp:57:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | while (pt<gr[i+1].size() and gr[i][j]>gr[i+1][pt]) | ~~^~~~~~~~~~~~~~~ main.cpp:61:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | if (pt>=gr[i+1].size()) | ~~^~~~~~~~~~~~~~~~ main.cpp:73:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | for (int j=0; j<gr[1].size(); j++) | ~^~~~~~~~~~~~~