Compilare: user.cpp: In function ‘int main()’: user.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(Stack[Size].val>A) ^ user.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(Stack[Size].val>A) ^ user.cpp:18:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&N,&M); ^ user.cpp:21:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&A); ^ user.cpp:39:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&A,&B); ^