foo.cc: In function 'int main()':
foo.cc:8:28: error: 'memset' was not declared in this scope
  memset(flag,0,sizeof(flag));
                            ^
foo.cc:6:8: warning: unused variable 't' [-Wunused-variable]
  int n,t, a[9][9], l[9] = { 0 }, r[9] = { 0 }, s[9] = { 0 };
        ^

自豪的采用jd5进行评测(github.com/masnn/jd5)