foo.cc: In function 'int find(int, int)':
foo.cc:45:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,u=0,v;
           ^
foo.cc: In function 'int main()':
foo.cc:71:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%s",s1);
             ~~~~~^~~~~~~~~
foo.cc:78:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s",s+1);
         ~~~~~^~~~~~~~~~

正在同步测试数据，请稍后
[Hydro](https://hydro.ac)提供评测服务