/in/foo.cc: In function 'int main()':
/in/foo.cc:73:43: warning: 'r' may be used uninitialized [-Wmaybe-uninitialized]
   73 |                                 if (j-l<=r-j)  // 左侧近
      |                                          ~^~
/in/foo.cc:52:37: note: 'r' was declared here
   52 |                         long long l,r,lmin=1e18,rmin=1e18;
      |                                     ^
/in/foo.cc:73:38: warning: 'l' may be used uninitialized [-Wmaybe-uninitialized]
   73 |                                 if (j-l<=r-j)  // 左侧近
      |                                     ~^~
/in/foo.cc:52:35: note: 'l' was declared here
   52 |                         long long l,r,lmin=1e18,rmin=1e18;
      |                                   ^