foo.cc: In function 'int main()':
foo.cc:11:13: error: 'i' was not declared in this scope
   11 |         For(i,1,n)  scanf("%d",&t[i]);
      |             ^
foo.cc:11:9: error: 'For' was not declared in this scope
   11 |         For(i,1,n)  scanf("%d",&t[i]);
      |         ^~~

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