Compilare: main.cpp: In function 'void check(int, int)': main.cpp:33:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | while (i < v[x].size() && j < v[y].size()) | ~~^~~~~~~~~~~~~ main.cpp:33:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | while (i < v[x].size() && j < v[y].size()) | ~~^~~~~~~~~~~~~ main.cpp:44:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | while (i < v[x].size()) | ~~^~~~~~~~~~~~~ main.cpp:48:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | while (j < v[y].size()) | ~~^~~~~~~~~~~~~