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#include<bits/stdc++.h>
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using namespace std;
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//<2F><>ӡ<EFBFBD><D3A1><EFBFBD><EFBFBD>ȫ<EFBFBD><C8AB>Ԫ<EFBFBD><D4AA>
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void prt(int arr[], int end) {
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for (int i = 0; i <= end; ++i) {
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printf("%d", arr[i]);
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}
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printf("\n");
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}
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//ȫ<><C8AB><EFBFBD><EFBFBD> c++ʵ<><CAB5>
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//https://blog.csdn.net/u013309870/article/details/68941284
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//https://blog.csdn.net/jiaobuchong/article/details/85369970
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//https://www.cnblogs.com/kiritozhj/p/10501470.html
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// https://blog.csdn.net/sofia_m/article/details/78865892
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void perm(int arr[], int begin, int end) {
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//<2F>ݹ<EFBFBD><DDB9><EFBFBD><EFBFBD>ڣ<EFBFBD><DAA3><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>ӡ<EFBFBD><D3A1><EFBFBD><EFBFBD>
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if (begin == end) {
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prt(arr, end);
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return;
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}
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//<2F><>û<EFBFBD><C3BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD>еݹ<D0B5><DDB9>ĵݹ<C4B5><DDB9>忪<EFBFBD><E5BFAA>
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for (int i = begin; i <= end; ++i) {
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><D4AA>ֵ
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swap(arr[begin], arr[i]);
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//<2F>ݹ<EFBFBD><DDB9><EFBFBD>
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perm(arr, begin + 1, end);
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//<2F>ָ<EFBFBD>ԭ״
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swap(arr[begin], arr[i]);
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}
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}
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int main()
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{
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int arr[3] = { 3,1,2 };
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perm(arr, 0, 2);
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}
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