View Compilation Error

0_0_18347041_21120.cpp: In function 'int main()':
0_0_18347041_21120.cpp:38:4: error: 'dp' was not declared in this scope
    dp[a[i]] = 0;
    ^
0_0_18347041_21120.cpp:41:4: error: 'dp' was not declared in this scope
    dp[a[m]] = 0;
    ^