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View Compilation Error

0_0_28960034_17958\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_28960034_17958\Main.java:3: 错误: 需要class, interface或enum
		int N = sn.nextInt();
		^
0_0_28960034_17958\Main.java:4: 错误: 需要class, interface或enum
		for(int i = 0;i < N ;i++) {
		^
0_0_28960034_17958\Main.java:4: 错误: 需要class, interface或enum
		for(int i = 0;i < N ;i++) {
		              ^
0_0_28960034_17958\Main.java:4: 错误: 需要class, interface或enum
		for(int i = 0;i < N ;i++) {
		                     ^
0_0_28960034_17958\Main.java:6: 错误: 需要class, interface或enum
			System.out.println(f(M));
			^
0_0_28960034_17958\Main.java:7: 错误: 需要class, interface或enum
		}
		^
0_0_28960034_17958\Main.java:10: 错误: 需要class, interface或enum
	}
	^
0_0_28960034_17958\Main.java:11: 错误: 需要class, interface或enum
	public static int f(int step) {
	              ^
0_0_28960034_17958\Main.java:14: 错误: 需要class, interface或enum
		else if(step == 2)
		^
0_0_28960034_17958\Main.java:16: 错误: 需要class, interface或enum
		else if(step == 3)
		^
0_0_28960034_17958\Main.java:18: 错误: 需要class, interface或enum
		else 
		^
0_0_28960034_17958\Main.java:20: 错误: 需要class, interface或enum
	}
	^
13 个错误


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