Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(i = 0; i < v[u].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for(i = 0; i < adj.size(); i++) | ~~^~~~~~~~~~~~ main.cpp:61:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | for(i = 1; i < adj.size(); i++) | ~~^~~~~~~~~~~~ main.cpp:78:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | if(Q[i].comp < adj.size()-1) | ~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:41:21: warning: unused variable 'b' [-Wunused-variable] 41 | int n, q, i, a, b, l, r, ans; | ^