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#include<bits/stdc++.h>
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//<2F>˴<EFBFBD><CBB4>ر<EFBFBD>˵<EFBFBD><CBB5><EFBFBD>£<EFBFBD>C<EFBFBD><43><EFBFBD>Ե<EFBFBD>ȫ<EFBFBD>ֱ<EFBFBD><D6B1><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>и<EFBFBD>ֵǰĬ<C7B0><C4AC>Ϊ0<CEAA><30><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>book<6F><6B><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȫ<EFBFBD><C8AB><EFBFBD>ٴθ<D9B4><CEB8><EFBFBD>ֵ0
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int a[10], book[10], n;
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//step<65><70><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵڼ<DAB5><DABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0>
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void dfs (int step) {
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int i;
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if (step == n+1) {
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//<2F><><EFBFBD><EFBFBD>վ<EFBFBD>ڵ<EFBFBD>n+1<><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD>棬<EFBFBD><E6A3AC><EFBFBD><EFBFBD>ʾǰn<C7B0><6E><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD><D1BE>ź<EFBFBD><C5BA>˿<EFBFBD><CBBF><EFBFBD>
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//<2F><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD>1~n<>ź<EFBFBD><C5BA><EFBFBD><EFBFBD>е<EFBFBD><D0B5>˿<EFBFBD><CBBF>Ʊ<EFBFBD><C6B1>ţ<EFBFBD>
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for (i = 1; i <= n; i++) {
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printf("%d", a[i]);
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}
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printf("\n");
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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><>ʱվ<CAB1>ڵ<EFBFBD>step<65><70><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0>Ӧ<EFBFBD>÷<EFBFBD><C3B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//<2F><><EFBFBD><EFBFBD>1<EFBFBD><31>2<EFBFBD><32>3<EFBFBD><33><EFBFBD><EFBFBD><EFBFBD><EFBFBD>n<EFBFBD><6E>˳<EFBFBD><CBB3>һһ<D2BB><D2BB><EFBFBD><EFBFBD>
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for (i = 1; i <= n; i++) {
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//<2F>ж<EFBFBD><D0B6>˿<EFBFBD><CBBF><EFBFBD>i<EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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if (book[i] == 0) {
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//<2F><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9><EFBFBD>˿<EFBFBD><CBBF><EFBFBD>
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a[step] = i;//<2F><>i<EFBFBD><69><EFBFBD>˿<EFBFBD><CBBF>Ʒ<EFBFBD><C6B7><EFBFBD><EFBFBD><EFBFBD>step<65>ź<EFBFBD><C5BA><EFBFBD><EFBFBD><EFBFBD>
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book[i] = 1;//<2F><>book[i]<5D><><EFBFBD><EFBFBD>0<EFBFBD><30>ʾi<CABE><69><EFBFBD>˿<EFBFBD><CBBF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//<2F><>step<65><70><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD><D1BE>ź<EFBFBD><C5BA><EFBFBD><EFBFBD>˿<EFBFBD><CBBF>ƣ<EFBFBD><C6A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>ߵ<EFBFBD><DFB5><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0>
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dfs(step+1);//<2F><><EFBFBD><EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵݹ<C4B5><DDB9><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ֵģ<D6B5><C4A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><D4BC><EFBFBD>
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book[i] = 0;//<2F><><EFBFBD>Ƿdz<C7B7><C7B3><EFBFBD>Ҫ<EFBFBD><D2AA>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>Ҫ<EFBFBD><D2AA><EFBFBD>ղų<D5B2><C5B3>Ե<EFBFBD><D4B5>˿<EFBFBD><CBBF><EFBFBD><EFBFBD>ջأ<D5BB><D8A3><EFBFBD><EFBFBD>ܽ<EFBFBD><DCBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>γ<EFBFBD><CEB3><EFBFBD>
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}
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}
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return;
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}
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int main(int argc, const char * argv[]) {
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scanf ("%d", &n);//<2F><><EFBFBD><EFBFBD>ʱҪע<D2AA><D7A2>nΪ1~9֮<39><D6AE><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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dfs(1);//<2F><><EFBFBD><EFBFBD>վ<EFBFBD><D5BE>1<EFBFBD><31>С<EFBFBD><D0A1><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0>
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return 0;
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}
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