Compilare: user.cpp: In function ‘int main()’: user.cpp:67:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < w.size(); ++j) { ^ user.cpp:48:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:50:44: 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, &r); ^