diff --git a/BZOJ/3781/3781.cpp b/BZOJ/3781/3781.cpp new file mode 100644 index 00000000..af64baec --- /dev/null +++ b/BZOJ/3781/3781.cpp @@ -0,0 +1,72 @@ +#include +#include +#include +#include +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +const int N = 5e4 + 5; + +int n, m, k, a[N], c[N], t, ans[N]; +std::vector> q; + +inline void add(int x, int &res) { + res += 2 * c[x] + 1; + c[x]++; +} + +inline void del(int x, int &res) { + res -= 2 * c[x] - 1; + c[x]--; +} + +int main() { + std::ios::sync_with_stdio(false); + cin.tie(nullptr); + + cin >> n >> m >> k; + + for (int i = 1; i <= n; i++) { + cin >> a[i]; + } + + t = sqrt(n); + + for (int i = 1, l, r; i <= m; i++) { + cin >> l >> r; + + q.push_back(std::make_tuple(i, l, r)); + } + + std::sort(q.begin(), q.end(), [&](auto a, auto b) { + int p = std::get<1>(a) / t, + q = std::get<1>(b) / t; + + return p == q + ? (p & 1) + ? std::get<2>(a) < std::get<2>(b) + : std::get<2>(a) > std::get<2>(b) + : p < q; + }); + + int i = 0, j = 1, res = 0, id, l, r; + for (auto &e : q) { + std::tie(id, l, r) = e; + + while (i < r) add(a[++i], res); + while (i > r) del(a[i--], res); + while (j < l) del(a[j++], res); + while (j > l) add(a[--j], res); + + ans[id] = res; + } + + for (int i = 1; i <= m; i++) { + cout << ans[i] << endl; + } + + return 0; +} diff --git a/BZOJ/3781/data/1.in b/BZOJ/3781/data/1.in new file mode 100644 index 00000000..dfc40d1f --- /dev/null +++ b/BZOJ/3781/data/1.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:54925f4de2aff1cb263f9e325fdbe0dfc44f1e52c6fc15e19aa89f74c65f4288 +size 851779 diff --git a/BZOJ/3781/data/1.out b/BZOJ/3781/data/1.out new file mode 100644 index 00000000..942361a7 --- /dev/null +++ b/BZOJ/3781/data/1.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:41fa9ce4bb7e2ff2dc1b93e6f0332d412ac2d4675d8a22270b6aad677060e9cc 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