View Compilation Error

0_0_31702217_23453.cpp: In function 'int main()':
0_0_31702217_23453.cpp:36:4: error: 'dp' was not declared in this scope
    dp [a[i].sum][a[i].tim]++;
    ^
0_0_31702217_23453.cpp:44:22: error: no match for 'operator[]' (operand types are 'xb' and 'int')
     mxn = max (a[i-1][j],dp[i-1][j-1]);
                      ^
0_0_31702217_23453.cpp:44:26: error: 'dp' was not declared in this scope
     mxn = max (a[i-1][j],dp[i-1][j-1]);
                          ^
0_0_31702217_23453.cpp:52:3: error: expected primary-expression before '}' token
   }
   ^