foo.cc: In function 'int main()':
foo.cc:16:28: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   16 |                         if(a[j]<a;
      |                            ^
foo.cc:16:32: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   16 |                         if(a[j]<a;
      |                            ~~~~^~
foo.cc:16:32: warning: statement has no effect [-Wunused-value]
foo.cc:17:37: error: expected ')' before ';' token
   17 |                                 ok=0;cnt++;
      |                                     ^
      |                                     )
foo.cc:16:27: note: to match this '('
   16 |                         if(a[j]<a;
      |                           ^
foo.cc:17:35: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   17 |                                 ok=0;cnt++;
      |                                 ~~^~
foo.cc:16:25: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   16 |                         if(a[j]<a;
      |                         ^~
foo.cc:17:38: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   17 |                                 ok=0;cnt++;
      |                                      ^~~
foo.cc:19:17: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   19 |                 if(ok==1);
      |                 ^~
foo.cc:20:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   20 |                 {
      |                 ^
foo.cc:5:24: warning: unused variable 'k' [-Wunused-variable]
    5 |         int n,a[20000],k,cnt;
      |                        ^

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