View Compilation Error

0_0_18774613_7706.cpp: In function 'int main()':
0_0_18774613_7706.cpp:11:13: error: 'n' was not declared in this scope
   for(i=0;i<n;i++)
             ^
0_0_18774613_7706.cpp:13:13: error: 'm' was not declared in this scope
   for(j=0;j<m;j++)
             ^
0_0_18774613_7706.cpp:15:13: error: 'n' was not declared in this scope
   for(i=0;i<n;i++)
             ^
0_0_18774613_7706.cpp:18:14: error: 'm' was not declared in this scope
    for(j=0;j<m;j++)
              ^
0_0_18774613_7706.cpp:20:11: error: invalid types 'int[int]' for array subscript
     if(a[i]==b[j])
           ^
0_0_18774613_7706.cpp:20:17: error: invalid types 'int[int]' for array subscript
     if(a[i]==b[j])
                 ^
0_0_18774613_7706.cpp:25:13: error: invalid types 'int[int]' for array subscript
     z[k]=a[i];
             ^