View Compilation Error

0_0_15042328_6884.cpp: In function 'int main()':
0_0_15042328_6884.cpp:65:5: error: 'i' was not declared in this scope
   f[i][j][a[i][j]] = a[i][j] * a[i][j];
     ^
0_0_15042328_6884.cpp:65:8: error: 'j' was not declared in this scope
   f[i][j][a[i][j]] = a[i][j] * a[i][j];
        ^