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33 lines
815 B
C++
33 lines
815 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 = 1; i <= n; i++)
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scanf("%d", a + i);
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vector<pair<int, int>> ans;
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set<int> s;
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int last = 0;
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for (int i = 1; i <= n; i++)
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if (s.empty())
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s.insert(a[last = i]);
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else if (s.count(a[i]))
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ans.push_back(make_pair(last, i)), s.clear();
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else
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s.insert(a[i]);
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if (ans.empty())
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puts("-1");
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else
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{
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ans.rbegin()->second = n;
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printf("%d\n", ans.size());
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for (auto &x : ans)
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printf("%d %d\n", x.first, x.second);
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}
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return 0;
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} |