Compilare: main.cpp: In function 'int main()': main.cpp:55:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if (l < v[a + 1].size() && v[a + 1][l] >= b) | ~~^~~~~~~~~~~~~~~~~ main.cpp:87:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 87 | if (l < v[xi].size() && v[xi][l] >= yi) | ~~^~~~~~~~~~~~~~