Compilare: main.cpp: In function 'void dfs1(int, const std::vector<std::vector<int> >&, std::vector<int>&)': main.cpp:13:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i = 0;i < adj[root].size();++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, const std::vector<std::vector<int> >&)': main.cpp:27:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for(int i = 0;i < adj[root].size();++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void build(int, const std::vector<std::vector<int> >&, const std::vector<std::vector<int> >&, std::vector<std::vector<int> >&)': main.cpp:43:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i = 0;i < v.size();++i) | ~~^~~~~~~~~~ main.cpp:55:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(int j = 0;j < adj[i].size();++j) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'std::vector<int> solve(int, const std::vector<std::vector<int> >&)': main.cpp:77:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | for(int j = 0;j < adj[i].size();++j) | ~~^~~~~~~~~~~~~~~ main.cpp:95:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | for(int i = 0;i < adj[nod].size();++i) | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:132:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 132 | for(int i = 0;i < graph.size();++i) | ~~^~~~~~~~~~~~~~ main.cpp:134:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 134 | for(int j = 0;j < graph[i].size();++j) | ~~^~~~~~~~~~~~~~~~~ main.cpp:159:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 159 | for(int i = 0;i < tmp.size();++i) | ~~^~~~~~~~~~~~ main.cpp:169:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 169 | for(int i = 0;i < ans.size();++i) | ~~^~~~~~~~~~~~