Compilare: user.cpp: In function ‘void DFS_find(std::vector<std::vector<int> >&, std::vector<int>&, int, std::vector<int>&, std::vector<int>&, int)’: user.cpp:36:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < g[n].size(); i ++){ ^ user.cpp: In function ‘int main()’: user.cpp:63:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[i].size(); j++) ^ user.cpp:89:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < comp_conexe[i].size(); j++) ^ user.cpp:111:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < muchii_sup.size(); i++) ^ user.cpp:47:50: warning: unused variable ‘len’ [-Wunused-variable] int N, M, i, j, a, b, nr_conexe = 0, leader, len; ^