Compilare: main.cpp: In function 'int32_t main()': main.cpp:46:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for (int j = 0; j < slopes[i].size(); ++j) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | while (k < slopes[i].size() and intersect(slopes[i][j], slopes[i][k])) { | ~~^~~~~~~~~~~~~~~~~~