Compilare: user.cpp: In function ‘int main()’: user.cpp:65:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < vs.size(); j++) { ^ user.cpp:49:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n", &n); ^ user.cpp:51:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d\n", &x[i], &y[i]); ^