foo.cc: In function 'void solve()':
foo.cc:113:30: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  113 |                 int mid = l+r+1 >> 1;
      |                           ~~~^~
foo.cc:107:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  107 |         scanf("%d",&n);
      |         ~~~~~^~~~~~~~~
foo.cc:109:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  109 |                 scanf("%d%d",a+i,b+i);
      |                 ~~~~~^~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:128:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  128 |         scanf("%d",&t);
      |         ~~~~~^~~~~~~~~

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