Compilare: main.cpp: In function 'void solve(int, int, int, int)': main.cpp:30:31: warning: statement has no effect [-Wunused-value] 30 | mem[lin1][col1][lin2][col2]; | ~~~~~~~~~~~~~~~~~~~~~~~~~~^ main.cpp: In function 'int main()': main.cpp:46:17: warning: array subscript has type 'char' [-Wchar-subscripts] 46 | mat[i][j] = (int)temp_mem; | ^ main.cpp:46:20: warning: array subscript has type 'char' [-Wchar-subscripts] 46 | mat[i][j] = (int)temp_mem; | ^ main.cpp:47:17: warning: array subscript has type 'char' [-Wchar-subscripts] 47 | mat[i][j] += mat[i-1][j] + mat[i][j-1] - mat[i-1][j-1]; | ^ main.cpp:47:20: warning: array subscript has type 'char' [-Wchar-subscripts] 47 | mat[i][j] += mat[i-1][j] + mat[i][j-1] - mat[i-1][j-1]; | ^ main.cpp:47:35: warning: array subscript has type 'char' [-Wchar-subscripts] 47 | mat[i][j] += mat[i-1][j] + mat[i][j-1] - mat[i-1][j-1]; | ^ main.cpp:47:44: warning: array subscript has type 'char' [-Wchar-subscripts] 47 | mat[i][j] += mat[i-1][j] + mat[i][j-1] - mat[i-1][j-1]; | ^