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86
S2OJ/1651/1651.cpp
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86
S2OJ/1651/1651.cpp
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#include <iostream>
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#include <cmath>
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#include <vector>
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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 = 2e5 + 5;
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int n, q, k, b, l[N], id[N], w[N], cnt[505][505], t[N], sum, res;
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std::vector<int> pos[N], large;
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bool st[N];
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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 >> q >> k;
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b = std::ceil(std::sqrt(n));
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for (int i = 1; i <= n; i++) {
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cin >> l[i];
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pos[l[i]].emplace_back(i);
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if (l[i] == l[i - 1]) w[l[i]]++;
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}
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for (int i = 1; i <= n; i++) {
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if (pos[i].size() > b) {
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large.emplace_back(i);
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id[i] = large.size();
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}
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}
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for (int i = 0; i < large.size(); i++) {
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for (int x : pos[large[i]]) {
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if (id[l[x - 1]]) {
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cnt[i + 1][id[l[x - 1]]]++;
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}
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if (id[l[x + 1]]) {
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cnt[i + 1][id[l[x + 1]]]++;
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}
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}
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}
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while (q--) {
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int x;
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cin >> x;
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st[x] ^= 1;
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int o = st[x] ? 1 : -1;
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sum += o * pos[x].size();
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res += o * w[x];
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if (id[x]) {
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for (int i = 1; i <= large.size(); i++) {
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if (i == id[x]) continue;
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if (st[large[i - 1]]) {
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res += o * cnt[id[x]][i];
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}
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}
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res += o * t[x];
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} else {
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for (int y : pos[x]) {
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if (st[l[y - 1]] && l[y - 1] != l[y]) res += o;
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if (st[l[y + 1]] && l[y + 1] != l[y]) res += o;
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if (id[l[y - 1]] && l[y - 1] != l[y]) t[l[y - 1]] += o;
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if (id[l[y + 1]] && l[y + 1] != l[y]) t[l[y + 1]] += o;
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}
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}
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cout << sum - res << endl;
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}
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return 0;
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}
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