View Compilation Error

0_0_21871973_3054.cpp: In function 'int main()':
0_0_21871973_3054.cpp:56:45: error: 'p' was not declared in this scope
      int cur = sum(i-1, j-1) - sum(i-1, max(p[i-1][j], find(j-1))-1);
                                             ^