/in/foo.cc: In function 'int main()':
/in/foo.cc:65:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
         for(int i=0;i<a.len;i++)    //处理借位      
         ^~~
/in/foo.cc:70:6: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
      cout<<cnt<<'\n';  
      ^~~~