Compilare: user.cpp: In function ‘void BFS(int, int*)’: user.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[q[b]].size();i++) ^ user.cpp: In function ‘void Up(int, int)’: user.cpp:44:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<G[nod1].size()&&dist1[nod1]<dist1[G[nod1][i].nod]) ^ user.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<G[nod1].size()) ^ user.cpp:49:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<G[nod2].size()&&dist2[nod2]<dist2[G[nod2][i].nod]) ^ user.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<G[nod2].size()) ^ user.cpp: In function ‘long long int DFS(int)’: user.cpp:62:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:92:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[i].size();j++){ ^ user.cpp:82:30: 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:84:40: 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,&c); ^ user.cpp: In function ‘void Up(int, int)’: user.cpp:53:14: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(x>0&&y>0&&per[x]==0) ^ user.cpp:53:9: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(x>0&&y>0&&per[x]==0) ^