65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
#include <bits/stdc++.h>
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using namespace std;
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int const N = 50010;
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int n, m;
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// 线段树+单点修改
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#define mid ((l + r) >> 1)
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#define ls (u << 1)
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#define rs (u << 1 | 1)
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struct Node {
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int l, r;
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int sum;
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} tr[2][N << 2];
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void pushup(int w, int u) {
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tr[w][u].sum = tr[w][ls].sum + tr[w][rs].sum;
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}
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void build(int w, int u, int l, int r) {
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tr[w][u].l = l, tr[w][u].r = r;
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if (l == r) return;
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build(w, ls, l, mid);
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build(w, rs, mid + 1, r);
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}
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void change(int w, int u, int x, int v) {
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int l = tr[w][u].l, r = tr[w][u].r;
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if (l == r) {
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tr[w][u].sum += v;
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return;
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}
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if (x <= mid)
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change(w, ls, x, v);
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else
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change(w, rs, x, v);
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pushup(w, u);
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}
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int query(int w, int u, int L, int R) {
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int l = tr[w][u].l, r = tr[w][u].r;
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if (l >= L && r <= R) return tr[w][u].sum;
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if (l > R || r < L) return 0;
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return query(w, ls, L, R) + query(w, rs, L, R);
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}
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int main() {
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#ifndef ONLINE_JUDGE
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freopen("LOJ10115.in", "r", stdin);
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#endif
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// 加快读入
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ios::sync_with_stdio(false), cin.tie(0);
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int op, l, r;
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cin >> n >> m; // 第一行 n,m 表示道路总长为 n，共有 m 个操作；
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// n下面没有使用过。为什么呢？其实是n的上限N有用！我们就没有用到n,代码模板中也去掉了n的
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build(0, 1, 1, n);
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build(1, 1, 1, n);
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while (m--) {
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cin >> op >> l >> r;
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if (op == 1)
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change(0, 1, l, 1), change(1, 1, r, 1);
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else
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printf("%d\n", query(0, 1, 1, r) - query(1, 1, 1, l - 1));
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}
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return 0;
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} |