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#include<bits/stdc++.h>
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using namespace std;
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int a[10], book[10], n;
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//ȫ<><C8AB><EFBFBD><EFBFBD><EFBFBD>㷨<EFBFBD><E3B7A8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>dfs
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void dfs(int step)
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{
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int i;
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if (step == n + 1) //<2F><><EFBFBD><EFBFBD>վ<EFBFBD>ڵ<EFBFBD>n+1<><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾǰn<C7B0><6E><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD><D1BE><EFBFBD><EFBFBD>к<EFBFBD>
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{
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for (i = 1; i <= n; i++) //<2F><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD>1-n<><6E><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><D0B5>˿<EFBFBD><CBBF>Ʊ<EFBFBD><C6B1>ţ<EFBFBD>
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{
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cout << a[i];
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}
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cout << endl;
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return; //<2F><><EFBFBD><EFBFBD>֮ǰ<D6AE><C7B0>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>ε<EFBFBD><CEB5><EFBFBD>dfs<66><73><EFBFBD><EFBFBD><EFBFBD>ĵط<C4B5><D8B7><EFBFBD>
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}
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//<2F><>վ<EFBFBD>ڵ<EFBFBD>step<65><70><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰӦ<C7B0>÷<EFBFBD>ʲô<CAB2><C3B4>
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//<2F><><EFBFBD><EFBFBD>ʵ<EFBFBD><CAB5>1<EFBFBD><31>2<EFBFBD><32>3<EFBFBD><33>4.....<2E>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD>
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for (i = 1; i <= n; i++)
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{
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//<2F>ж<EFBFBD><D0B6>˿<EFBFBD><CBBF><EFBFBD>i<EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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if (book[i] == 0)
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{
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a[step] = i; //<2F><><EFBFBD><EFBFBD>i<EFBFBD><69><EFBFBD>˿<EFBFBD><CBBF>Ʒŵ<C6B7><C5B5><EFBFBD>step<65><70><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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book[i] = 1; //<2F><>book[i]<5D><><EFBFBD><EFBFBD>Ϊ1<CEAA><31><EFBFBD><EFBFBD>ʾ<EFBFBD><CABE>i<EFBFBD><69><EFBFBD>˿<EFBFBD><CBBF>Ʋ<EFBFBD><C6B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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dfs(step + 1); //<2F><>step<65><70><EFBFBD><EFBFBD><EFBFBD>ӷźú<C5BA><C3BA><EFBFBD><EFBFBD>ߵ<EFBFBD><DFB5><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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book[i] = 0; //ͬʱ<CDAC>ջظղų<D5B2><C5B3>Ե<EFBFBD><D4B5>˿<EFBFBD><CBBF><EFBFBD>
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}
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}
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return;
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}
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int main() {
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n=3;
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dfs(1);
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return 0;
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}
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