foo.cc: In function 'int turn(int)':
foo.cc:7:13: warning: unused variable 'j' [-Wunused-variable]
    7 |     int i=0,j;
      |             ^
foo.cc: In function 'int main()':
foo.cc:62:9: warning: unused variable 'i' [-Wunused-variable]
   62 |     int i,j;
      |         ^
foo.cc:62:11: warning: unused variable 'j' [-Wunused-variable]
   62 |     int i,j;
      |           ^
foo.cc:63:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   63 |     scanf("%d",&w);
      |     ~~~~~^~~~~~~~~

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Found 8 testcases.
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