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#1558. 【2022.9.14 联考】3aab198230b8fd9f
https://sjzezoj.com/submission/56419
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S2OJ/1558/1558.cpp
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S2OJ/1558/1558.cpp
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#include <iostream>
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#include <unordered_map>
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#include <unordered_set>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e6 + 5;
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int n, m, a[N];
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long long ans;
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std::unordered_set<int> set;
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std::unordered_map<int, int> map;
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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for (int i = 1, j = 0; i <= n - m + 1; i++) {
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while (j < n && set.size() < m) {
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set.insert(a[++j]);
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map[a[j]]++;
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}
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if (set.size() == m) ans += n - j + 1;
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if (!--map[a[i]]) set.erase(a[i]);
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}
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cout << ans << endl;
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return 0;
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}
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