foo.cc: In function 'int main()':
foo.cc:7:19: error: 's1' was not declared in this scope; did you mean 's'?
    7 |         cout<<s*2-s1;
      |                   ^~
      |                   s
foo.cc:5:16: warning: unused variable 'r2' [-Wunused-variable]
    5 |         int r1,r2,s;
      |                ^~

正在同步测试数据，请稍后