Compilare: main.cpp: In function 'int main()': main.cpp:36:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | while(i1 < v[i].size() && v[i][i1].first <= l + 1) | ~~~^~~~~~~~~~~~~ main.cpp:38:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | while(j1 < v[j].size() && v[j][j1].first <= l + 1) | ~~~^~~~~~~~~~~~~