0_0_24224862_28014.cpp: In function 'int main()': 0_0_24224862_28014.cpp:97:4: error: 'op' was not declared in this scope op ^= 1; ^ 0_0_24224862_28014.cpp:104:16: error: 'op' was not declared in this scope ans += dp[op ^ 1][i][j]; ^