Compilare: main.cpp: In function 'void DFS(int, int, int, int)': main.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<edge[node1].size(); i++){ ~^~~~~~~~~~~~~~~~~~~ main.cpp:20:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<edge[node2].size(); j++){ ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<edge[i].size(); j++){ ~^~~~~~~~~~~~~~~ main.cpp:43:9: warning: unused variable 'parent' [-Wunused-variable] int parent[V]; ^~~~~~