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16 lines
578 B
16 lines
578 B
#include <bits/stdc++.h>
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using namespace std;
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int a[4] = {1, 3, 2, 4};
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int main() {
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// 步骤总结：二进制的模拟一般分为两层循环
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// ① 枚举从1到 2^n-1,模拟每个可能出现的二进制状态对应的整数值
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for (int i = 1; i < 1 << 4; i++) {
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// ② 在对应的整数值确定后，枚举此数值的每一个数位
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for (int j = 0; j < 4; j++)
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// ③判断当前数位是不是1,是1表示当前数位选中
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if (i >> j & 1) printf("%d ", a[j]);
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puts("");
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}
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return 0;
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} |