Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:39:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < qry[f].size(); ++i) res[ pos[f][i] ] = Query(qry[f][i].x, qry[f][i].y); ^ user.cpp:40:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[f].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:53:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,c,x,y; ^ user.cpp:55:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&N,&M); ^ user.cpp:62:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&c); ^ user.cpp:66:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&t[vf].x,&t[vf].y,&t[vf].z); ^ user.cpp:71:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&x,&y); ^ user.cpp:77:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^