Compilare: user.cpp: In function ‘std::vector<int> mergeOrder(int, std::vector<int>, std::vector<int>)’: user.cpp:34:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= A.size(); i++) ^ user.cpp:36:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= B.size(); i++) ^ user.cpp:38:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= A.size(); i++) ^ user.cpp:39:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= B.size(); j++) ^ user.cpp: In function ‘void DFS(int, int)’: user.cpp:69:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:90:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Ord[0].size(); i++) ^