Compilare: main.cpp: In function 'void DFS(int, std::vector<bool>&)': main.cpp:18:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 0; i < G[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void solve(bool&, int, int, std::vector<bool>&, std::vector<std::vector<int> >&)': main.cpp:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 0; i < A[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:119:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto j = 0; j < A[x].size(); j++) ~~^~~~~~~~~~~~~ main.cpp:56:12: warning: unused variable 'start' [-Wunused-variable] int n, start, x = 0, y = 0, nr = 0, minim = 0; ^~~~~ main.cpp:56:19: warning: unused variable 'x' [-Wunused-variable] int n, start, x = 0, y = 0, nr = 0, minim = 0; ^ main.cpp:56:26: warning: unused variable 'y' [-Wunused-variable] int n, start, x = 0, y = 0, nr = 0, minim = 0; ^