Compilare: main.cpp: In function 'int BFS(int, int)': main.cpp:22:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < adj[node].size(); ++i ) { ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:44: 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, &s, &d ); ^ main.cpp:47:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &x, &y, &dt ); ^