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34 lines
760 B
C++
34 lines
760 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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using ll = long long;
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const int N = 1e6 + 60;
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int a[N];
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void die(int x)
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{
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printf("%d", x);
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exit(0);
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}
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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++) scanf("%d", a + i);
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multiset<ll> S(a, a + n);
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long long cur = 0;
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while (!S.empty())
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{
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int t = ceil(sqrt(*S.begin()));
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cur = max(cur, *S.begin());
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S.erase(S.begin());
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cur += t;
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auto ite = S.upper_bound(cur);
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if (ite != S.begin()) ite--;
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if (ite == S.end()) die(1);
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if (*ite != *S.begin()) die(0);
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}
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die(1);
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return 0;
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}
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