Compilare: user.cpp: In function ‘int main()’: user.cpp:21:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<Hash[r].size() && pp==0;i++) ^ user.cpp:41:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<Hash[r].size() && pp==0;i++){ ^ user.cpp:13:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:16:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&op,&val); ^