foo.cc: In function 'int main()':
foo.cc:40:43: warning: 'sc' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |  DQ.push_back(make_pair(make_pair(sr,sc),0));
      |                                           ^
foo.cc:40:43: warning: 'sr' may be used uninitialized in this function [-Wmaybe-uninitialized]
foo.cc:51:14: warning: 'tc' may be used uninitialized in this function [-Wmaybe-uninitialized]
   51 |   if(r==tr&&c==tc)
      |             ~^~~~
foo.cc:51:7: warning: 'tr' may be used uninitialized in this function [-Wmaybe-uninitialized]
   51 |   if(r==tr&&c==tc)
      |      ~^~~~

[Hydro](https://hydro.ac)提供评测服务