View Compilation Error

0_0_14242654_21533.cpp:6:1: error: 'LL' does not name a type
 LL ans = -1;
 ^
0_0_14242654_21533.cpp: In function 'void solve(int, int)':
0_0_14242654_21533.cpp:11:3: error: 'ans' was not declared in this scope
   ans = ans==-1?b:min(ans, b);
   ^
0_0_14242654_21533.cpp: In function 'int main()':
0_0_14242654_21533.cpp:22:2: error: 'LL' was not declared in this scope
  LL a, b;
  ^
0_0_14242654_21533.cpp:23:30: error: 'a' was not declared in this scope
  while (scanf("%I64d%I64d", &a, &b) != EOF)
                              ^
0_0_14242654_21533.cpp:23:34: error: 'b' was not declared in this scope
  while (scanf("%I64d%I64d", &a, &b) != EOF)
                                  ^
0_0_14242654_21533.cpp:25:3: error: 'ans' was not declared in this scope
   ans = -1;
   ^