foo.cc: In function 'int main()':
foo.cc:5:17: error: 'T' was not declared in this scope
    5 |     scanf("%d",&T);
      |                 ^
foo.cc:6:9: error: 'ii' was not declared in this scope
    6 |     For(ii,1,T)
      |         ^~
foo.cc:6:5: error: 'For' was not declared in this scope
    6 |     For(ii,1,T)
      |     ^~~

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