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35 lines
873 B
C++
35 lines
873 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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#define CRP(t, x) const t &x
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#define OPL(t, x) bool operator<(CRP(t, x)) const
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#define FIL(x, v) memset(x, v, sizeof(x))
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#define CLR(x) FIL(x, 0)
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#define NE1(x) FIL(x, -1)
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#define INF(x) FIL(x, 0x3f)
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#ifndef _DEBUG
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#define _DEBUG 0
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#endif // !_DEBUG
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#define IFD if (_DEBUG)
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typedef long long ll, i64;
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const int N = 1e5 + 50;
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int n, a[N], cnt[N], last[N];
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int main()
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{
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scanf("%d", &n);
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for (int i = 1; i <= n; i++) scanf("%d", a + i);
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ll ans = 0, cur = 0;
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for (ll i = 1; i <= n; i++)
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{
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cur += cnt[i] = cnt[i - 1];
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if (last[a[i]] == 0)
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cnt[i]++;
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else
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cur -= i - last[a[i]];
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last[a[i]] = i;
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ans += i * cnt[i] - cur;
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}
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printf("%lld", ans);
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return 0;
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} |