Compilare: user.cpp: In function ‘void add_nodes(int, int, int, int)’: user.cpp:104:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<nodes.size(); j++){ ^ user.cpp: In function ‘void DFS(int, int, std::vector<int>&)’: user.cpp:130:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=nodes.size(); i++) ^ user.cpp: In function ‘void concat(std::vector<int>&, int, std::vector<int>)’: user.cpp:149:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<y.size(); i++){ ^ user.cpp:152:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=pos+1; i<x.size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:196:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=nodes.size(); i++){ ^ user.cpp:201:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<ciclu.size(); j++){ ^ user.cpp: In function ‘void add_nodes(int, int, int, int)’: user.cpp:122:49: warning: ‘vecin’ may be used uninitialized in this function [-Wmaybe-uninitialized] graph[nod][vecin] = graph[vecin][nod] = true; ^ user.cpp:122:49: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized]