Compilare: user.cpp: In function ‘void calc()’: user.cpp:31:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(dp[st][k][it.first] && dp[k+1][dr][it.second]) ^ user.cpp:31:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(dp[st][k][it.first] && dp[k+1][dr][it.second]) ^ user.cpp: In function ‘int main()’: user.cpp:41:18: warning: unused variable ‘j’ [-Wunused-variable] int r,m,i,ok,j; ^