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View Compilation Error

0_0_11556024_17209\Main.java:1: 需要为 class、interface 或 enum
public static void main(String args[]) {  
              ^
0_0_11556024_17209\Main.java:3: 需要为 class、interface 或 enum
        int t = in.nextInt();  
        ^
0_0_11556024_17209\Main.java:4: 需要为 class、interface 或 enum
        int a[] = new int[3005];  
        ^
0_0_11556024_17209\Main.java:5: 需要为 class、interface 或 enum
        for (int cas = 1; cas <= t; cas++) {  
        ^
0_0_11556024_17209\Main.java:5: 需要为 class、interface 或 enum
        for (int cas = 1; cas <= t; cas++) {  
                          ^
0_0_11556024_17209\Main.java:5: 需要为 class、interface 或 enum
        for (int cas = 1; cas <= t; cas++) {  
                                    ^
0_0_11556024_17209\Main.java:7: 需要为 class、interface 或 enum
            int  i, j;  
            ^
0_0_11556024_17209\Main.java:8: 需要为 class、interface 或 enum
            for (i = 1; i <= n; ++i) {  
            ^
0_0_11556024_17209\Main.java:8: 需要为 class、interface 或 enum
            for (i = 1; i <= n; ++i) {  
                        ^
0_0_11556024_17209\Main.java:8: 需要为 class、interface 或 enum
            for (i = 1; i <= n; ++i) {  
                                ^
0_0_11556024_17209\Main.java:10: 需要为 class、interface 或 enum
            }  
            ^
0_0_11556024_17209\Main.java:12: 需要为 class、interface 或 enum
            BigInteger x = BigInteger.valueOf(1);  
            ^
0_0_11556024_17209\Main.java:13: 需要为 class、interface 或 enum
            BigInteger flag = BigInteger.valueOf(-1);  
            ^
0_0_11556024_17209\Main.java:14: 需要为 class、interface 或 enum
            n = n -1;  
            ^
0_0_11556024_17209\Main.java:15: 需要为 class、interface 或 enum
            for(i=1,j=n; i<=n; i++,j--)  
            ^
0_0_11556024_17209\Main.java:15: 需要为 class、interface 或 enum
            for(i=1,j=n; i<=n; i++,j--)  
                         ^
0_0_11556024_17209\Main.java:15: 需要为 class、interface 或 enum
            for(i=1,j=n; i<=n; i++,j--)  
                               ^
0_0_11556024_17209\Main.java:18: 需要为 class、interface 或 enum
                x = x.multiply(flag);  
                ^
0_0_11556024_17209\Main.java:19: 需要为 class、interface 或 enum
                ans = ans.add(x.multiply(BigInteger.valueOf(a[j])));  
                ^
0_0_11556024_17209\Main.java:20: 需要为 class、interface 或 enum
            }  
            ^
0_0_11556024_17209\Main.java:22: 需要为 class、interface 或 enum
        }  
        ^
21 错误


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