Compilare: main.cpp: In function 'void dfs(int)': main.cpp:11:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for(int i=0;i<x[k].size();i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:65:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for(int i=0;i<p.size();i++) | ~^~~~~~~~~ main.cpp:78:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for(int i=0;i<p.size();i++) | ~^~~~~~~~~