Compilare: user.cpp: In function ‘int main()’: user.cpp:42:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] ch[ p[ 0 ].y ] = 1; ^ user.cpp:45:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( ch[ p[ i ].x ] == 0 ) ^ user.cpp:48:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] suc[ i ].x = suc[ ch[ p[ i ].x ] - 1 ].x + 1; ^ user.cpp:49:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] suc[ i ].y = ch[ p[ i ].x ]; ^ user.cpp:50:50: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( suc[ i ].x >= suc[ max( ch[ p[ i ].y ] - 1 , 0 ) ].x ) ^ user.cpp:51:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] ch[ p[ i ].y ] = i + 1 ; ^