Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:31:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(i=0;i<a[k].size();i++) | ~^~~~~~~~~~~~ main.cpp:50:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(i=0;i<a[k].size();i++) | ~^~~~~~~~~~~~ main.cpp:60:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for(i=0;i<a[k].size();i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:80:11: warning: unused variable 'j' [-Wunused-variable] 80 | int i,j,k,l; | ^ main.cpp:80:13: warning: unused variable 'k' [-Wunused-variable] 80 | int i,j,k,l; | ^