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28 lines
754 B
C++
28 lines
754 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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int main() {
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multiset<int> S;
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int n, m;
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while (~scanf("%d", &m)) {
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n = sqrt(8 * m + 1) / 2;
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S.clear();
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for (int i = 0, x; i < m; i++) scanf("%d", &x), S.insert(x);
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vector<int> ans(n);
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for (int i = 0; i < n; i++) {
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ans[i] = *S.begin();
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for (int j = 0; j < i; j++)
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S.erase(S.find(ans[j] + ans[i]));
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S.erase(S.find(ans[i]));
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}
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printf("%d\n", n);
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for (int i = 0; i < ans.size(); i++)
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printf("%d%c", ans[i], " \n"[i == ans.size() - 1]);
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}
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return 0;
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}
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