foo.cc: In function 'void workk()':
foo.cc:45:27: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   45 |     for(register int i=1;i<dl[0];i++){//在multiset中找一下
      |                          ~^~~~~~
foo.cc: In function 'void workk2()':
foo.cc:57:27: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   57 |     for(register int i=1;i<dl[0];i++){
      |                          ~^~~~~~

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