foo.cc: In function 'int main()':
foo.cc:48:13: warning: unused variable 's' [-Wunused-variable]
   48 |         int s = i;
      |             ^
foo.cc:49:13: warning: unused variable 'e' [-Wunused-variable]
   49 |         int e = i+1;
      |             ^
foo.cc:45:6: warning: unused variable 'time' [-Wunused-variable]
   45 |  int time = 0;
      |      ^~~~

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