foo.cc: In function 'int main()':
foo.cc:16:19: warning: statement has no effect [-Wunused-value]
   16 |             num[t]==1;
      |             ~~~~~~^~~
foo.cc:20:22: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   20 |             printf("%d\n"),abs(a[1]-a[0]);
      |                     ~^
      |                      |
      |                      int
foo.cc:20:31: warning: right operand of comma operator has no effect [-Wunused-value]
   20 |             printf("%d\n"),abs(a[1]-a[0]);
      |                            ~~~^~~~~~~~~~~
foo.cc:59:17: warning: statement has no effect [-Wunused-value]
   59 |             for(i;i<N;i++){
      |                 ^
foo.cc:50:17: warning: unused variable 'sub' [-Wunused-variable]
   50 |             int sub=10,temp[10];
      |                 ^~~

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