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98
BZOJ/2120/2120.cpp
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98
BZOJ/2120/2120.cpp
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#include <iostream>
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#include <algorithm>
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#include <tuple>
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#include <utility>
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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 = 200005,
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M = 1e6 + 5;
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int n, m, a[N], cnt[M], t, ans[N];
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std::vector<std::pair<int, int>> c;
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std::vector<std::tuple<int, int, int, int>> q;
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inline void add(int x, int &res) {
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if (!cnt[x]++) res++;
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}
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inline void del(int x, int &res) {
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if (!--cnt[x]) res--;
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}
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inline void tim(int x, int i, int j, int &res) {
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if (j <= c[x].first && c[x].first <= i) {
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del(a[c[x].first], res);
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add(c[x].second, res);
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}
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std::swap(a[c[x].first], c[x].second);
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}
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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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c.push_back(std::make_pair(0, 0));
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for (int i = 1; i <= m; i++) {
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char op;
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int x, y;
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cin >> op >> x >> y;
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if (op == 'Q') {
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q.push_back(std::make_tuple(i, x, y, c.size() - 1));
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} else { // op == 'C'
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c.push_back(std::make_pair(x, y));
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}
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}
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t = 2609;
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std::sort(q.begin(), q.end(), [&](auto a, auto b) {
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int p = std::get<1>(a) / t,
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q = std::get<1>(b) / t;
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int x = std::get<2>(a) / t,
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y = std::get<2>(b) / t;
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return p == q
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? x == y
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? std::get<3>(a) < std::get<3>(b)
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: x < y
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: p < q;
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});
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int i = 0, j = 1, now = 0, res = 0;
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for (auto &e : q) {
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int id, l, r, t2;
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std::tie(id, l, r, t2) = e;
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while (i < r) add(a[++i], res);
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while (i > r) del(a[i--], res);
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while (j < l) del(a[j++], res);
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while (j > l) add(a[--j], res);
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while (now < t2) tim(++now, i, j, res);
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while (now > t2) tim(now--, i, j, res);
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ans[id] = res;
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}
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std::sort(q.begin(), q.end(), [&](auto a, auto b) {
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return std::get<0>(a) < std::get<0>(b);
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});
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for (auto &e : q) {
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cout << ans[std::get<0>(e)] << endl;
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}
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return 0;
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}
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