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27 lines
771 B
C++
27 lines
771 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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#define CR(t, x) const t &x
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using namespace std;
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typedef long long ll;
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const int N = 1e5 + 50;
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ll a[N];
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int main()
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{
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for (int n, q; ~scanf("%d%d", &n, &q);)
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{
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int blksz = sqrt(n);
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for (int i = 1; i <= n; i++) scanf("%lld", a + i);
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for (int i = 0, l, r; i < q; i++)
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{
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scanf("%d%d", &l, &r);
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vector<ll> v(a + l, a + r + 1);
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sort(v.begin(), v.end());
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reverse(v.begin(), v.end());
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ll ans = -1;
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if (v.size() >= 3 && v[0] <= v[1] + v[2]) ans = v[0] + v[1] + v[2];
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printf("%lld\n", ans);
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}
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}
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return 0;
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} |