Compilare: user.cpp: In function ‘int main()’: user.cpp:28:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (nr>=0 && s[i]>st[nr] && k>0) {nr--; k--;} ^ user.cpp:29:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] st[++nr] = s[i]; ^ user.cpp:14:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:2:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] #define cit(c) while (c!='\n') fscanf(f,"%c",&c); ^ user.cpp:15:5: note: in expansion of macro ‘cit’ cit(c); ^ user.cpp:16:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",s); ^