Compilare: user.cpp: In function ‘int main()’: user.cpp:58:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<S.size(); i++) { ^ user.cpp:74:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<J.size();i++) ^ user.cpp:32:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:34:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &y, &x1, &x2); ^