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#include <bits/stdc++.h>
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using namespace std;
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const int N = 30;
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string a[N];
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bool cmp(const string &a, const string &b) {
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//自定义排序函数，这一步非常巧妙，假设a=321，b=32；a+b=32132，b+a=32321
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// 这样下面sort排下来就是32>321避免出现32132>32321的情况
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return a + b > b + a;
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}
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int main() {
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int n;
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cin >> n;
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for (int i = 1; i <= n; i++) cin >> a[i];
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sort(a + 1, a + 1 + n, cmp);
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for (int i = 1; i <= n; i++)cout << a[i];
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return 0;
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}
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