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View Compilation Error

0_0_21948729_32062.cpp:2:9: error: expected ':' before 'static'
  public static void main(String[] args) {
         ^
0_0_21948729_32062.cpp:2:26: error: 'String' has not been declared
  public static void main(String[] args) {
                          ^
0_0_21948729_32062.cpp:2:35: error: expected ',' or '...' before 'args'
  public static void main(String[] args) {
                                   ^
0_0_21948729_32062.cpp:24:1: error: expected ';' after class definition
 }
 ^
0_0_21948729_32062.cpp: In static member function 'static void Main::main(int*)':
0_0_21948729_32062.cpp:3:3: error: 'Scanner' was not declared in this scope
   Scanner scanner = new Scanner(System.in);
   ^
0_0_21948729_32062.cpp:4:13: error: 'scanner' was not declared in this scope
   int num = scanner.nextInt();
             ^
0_0_21948729_32062.cpp:5:7: error: expected unqualified-id before '[' token
   long[] distance = new long[49];
       ^
0_0_21948729_32062.cpp:6:3: error: 'distance' was not declared in this scope
   distance[0]=1;
   ^
0_0_21948729_32062.cpp:19:4: error: 'System' was not declared in this scope
    System.out.println(distance[b-a-1]);
    ^


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