Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < G[v].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:48:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &m, &x, &y); ^ user.cpp:52:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &e1, &e2, &cost); ^