foo.cc: In function ‘int main()’:
foo.cc:8:17: warning: unused variable ‘now’ [-Wunused-variable]
    8 |     int n,i,j,k,now,nx,ans=0;
      |                 ^~~
foo.cc:8:21: warning: unused variable ‘nx’ [-Wunused-variable]
    8 |     int n,i,j,k,now,nx,ans=0;
      |                     ^~

正在同步测试数据，请稍后