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View Compilation Error

0_0_11428789_30521\Main.java:26: 已在 main(java.lang.String[]) 中定义 a
BigInteger a=BigInteger.ONE;
           ^
0_0_11428789_30521\Main.java:27: 不兼容的类型
找到: int
需要: java.math.BigInteger
a = cin.nextInt();
               ^
0_0_11428789_30521\Main.java:31: 运算符 / 不能应用于 java.math.BigInteger,int
for(i=0;i<=a/2;i++)
            ^
0_0_11428789_30521\Main.java:32: 运算符 - 不能应用于 java.math.BigInteger,int
if(a-i-i<=b)
    ^
0_0_11428789_30521\Main.java:33: 无法将 Main 中的 C(int,int) 应用于 (java.math.BigInteger,int)
t=t.add(C(a,i));
        ^
0_0_11428789_30521\Main.java:35: 运算符 % 不能应用于 java.math.BigInteger,int
if(a%2==0)
    ^
0_0_11428789_30521\Main.java:36: 运算符 / 不能应用于 java.math.BigInteger,int
t=t.subtract(C(a,a/2));
                  ^
7 错误


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