Compilare: user.cpp: In function ‘bool BFS(int, int)’: user.cpp:33:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[Q.front()].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:70:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&N); ^ user.cpp:74:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&cap[i][j]),S+=cap[i][j]; ^