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20 lines
453 B
C++
20 lines
453 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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const int N = 3e5 + 50;
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int a[N];
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int main()
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{
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int n;
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scanf("%d", &n);
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for (int i = 0; i < n; i++)
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scanf("%d", a + i);
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sort(a, a + n);
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long long sum = 0;
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for (int i = 0, j = n - 1; i < j; i++, j--)
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sum += 1ll * (a[i] + a[j]) * (a[i] + a[j]);
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printf("%lld", sum);
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return 0;
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}
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