Compilare: main.cpp: In function 'void dfs(int)': main.cpp:10:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | for (i = 0; i < v[x].size(); i++) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'void dfsr(int)': main.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (i = 0; i < vr[x].size(); i++) { | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:50:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (i = 0; i < r.size(); i++) { | ~~^~~~~~~~~~ main.cpp:51:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for (j = 0; j < r[i].size(); j++) { | ~~^~~~~~~~~~~~~