View Compilation Error

0_0_39389791_17280.cpp:3:1: error: '::main' must return 'int'
    3 | void main()
      | ^~~~
0_0_39389791_17280.cpp: In function 'int main()':
0_0_39389791_17280.cpp:7:14: error: 'i' was not declared in this scope
    7 |         for (i = 3; i <= 20; i++)
      |              ^
0_0_39389791_17280.cpp:15:30: error: 'i' was not declared in this scope
   15 |                         for (i = n - m + 1; i <= n; i++)
      |                              ^