foo.cc: In function 'int main()':
foo.cc:27:13: error: 'i' was not declared in this scope
   27 |         for(i=1;i<=n;i++){
      |             ^
foo.cc:49:9: error: 'i' was not declared in this scope; did you mean 'vi'?
   49 |     for(i=vi.size()-1;i>=0;i--){
      |         ^
      |         vi
foo.cc:50:22: error: request for member 'vi' in '"%d "', which is of non-class type 'const char [4]'
   50 |         printf("%d ".vi[i]);
      |                      ^~
foo.cc:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:18:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |             scanf("%d",&f[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~

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