Compilare: user.cpp: In function ‘void calc(int, int)’: user.cpp:73:53: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty() && pr[op.top()]>=pr[stock[x][y][i]]) ^ user.cpp:73:73: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty() && pr[op.top()]>=pr[stock[x][y][i]]) ^ user.cpp:32:10: warning: unused variable ‘j’ [-Wunused-variable] LL i,j,ls,a,b,ca,cb; ^ user.cpp: In function ‘long long int calculeaza(char, long long int, long long int)’: user.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type] } ^