Compilare: user.cpp: In function ‘int bfs()’: user.cpp:25:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[node].size(); j++){ ^ user.cpp: In function ‘int main()’: user.cpp:63:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[D].size(); i++){ ^ user.cpp:93:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V.size(); i++) ^ user.cpp:46:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &m); ^ user.cpp:49:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d", &x, &y, &z); ^