View Compilation Error

0_0_37036534_10804.cpp: In function 'int main()':
0_0_37036534_10804.cpp:19:9: error: 'a' was not declared in this scope
         a[i].shun = ((h * 60 + m) * 360 + s * 6 + MOD - tmp) % MOD;
         ^
0_0_37036534_10804.cpp:22:10: error: 'a' was not declared in this scope
     sort(a + 1, a + n + 1, cmp);
          ^
0_0_37036534_10804.cpp:22:28: error: 'cmp' was not declared in this scope
     sort(a + 1, a + n + 1, cmp);
                            ^
0_0_37036534_10804.cpp:25:6: error: 'res1' was not declared in this scope
      res1 = MOD - a[1].shun;
      ^
0_0_37036534_10804.cpp:26:6: error: 'res2' was not declared in this scope
      res2 = MOD - a[n].ni;
      ^