Compilare: main.cpp: In function 'void bfs01(int)': main.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < gr[nod].size (); i++) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d", &n, &m, &g); ^ main.cpp:46:39: 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, &c); ^