foo.cc: In function 'int read()':
foo.cc:11:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   11 |         if(ch=='-')w=-1;ch=getchar();
      |         ^~
foo.cc:11:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   11 |         if(ch=='-')w=-1;ch=getchar();
      |                         ^~
foo.cc: In function 'bool read(int&)':
foo.cc:24:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   24 |         if(ch=='-')w=-1;ch=getchar();
      |         ^~
foo.cc:24:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   24 |         if(ch=='-')w=-1;ch=getchar();
      |                         ^~
foo.cc: In function 'int main()':
foo.cc:222:15: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
  222 |         insert(y,s);
      |         ~~~~~~^~~~~
foo.cc:223:20: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
  223 |         lab:writeln(kth(k));
      |             ~~~~~~~^~~~~~~~
foo.cc:222:15: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  222 |         insert(y,s);
      |         ~~~~~~^~~~~
foo.cc:221:12: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  221 |         del(x,s);
      |         ~~~^~~~~
foo.cc:212:15: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  212 |         insert(x,1);
      |         ~~~~~~^~~~~
foo.cc:207:9: warning: 'n' may be used uninitialized in this function [-Wmaybe-uninitialized]
  207 |     int n,m;
      |         ^
foo.cc:207:11: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
  207 |     int n,m;
      |           ^

[Hydro](https://hydro.ac)提供评测服务