84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
#include <iostream>
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#include <algorithm>
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#include <cstdio>
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#include <cstring>
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using namespace std;
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typedef long long LL;
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const int N = 100010;
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int n, q;
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struct Node {
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int l, r;
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LL sum;
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int tag;
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} tr[N << 2];
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void pushup(int u) {
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tr[u].sum = tr[u << 1].sum + tr[u << 1 | 1].sum;
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}
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void bulid(int u, int l, int r) {
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tr[u] = {l, r};
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if (l == r) {
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tr[u].sum = 1;
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return;
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}
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int mid = (l + r) >> 1;
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bulid(u << 1, l, mid), bulid(u << 1 | 1, mid + 1, r);
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pushup(u);
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}
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void pushdown(int u) {
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Node &root = tr[u], &ls = tr[u << 1], &rs = tr[u << 1 | 1];
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if (root.tag) { // 如果懒标记不为零,需要向儿子们传递懒标记
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ls.tag = root.tag, ls.sum = (LL)(ls.r - ls.l + 1) * root.tag;
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rs.tag = root.tag, rs.sum = (LL)(rs.r - rs.l + 1) * root.tag;
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root.tag = 0; // 清空懒标记
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}
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}
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void modify(int u, int l, int r, int v) {
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if (l <= tr[u].l && tr[u].r <= r) {
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tr[u].sum = (LL)v * (tr[u].r - tr[u].l + 1);
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tr[u].tag = v;
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return;
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}
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pushdown(u); // 没有完全覆盖则分裂
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int mid = (tr[u].l + tr[u].r) >> 1;
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if (l <= mid) modify(u << 1, l, r, v);
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if (r > mid) modify(u << 1 | 1, l, r, v);
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pushup(u);
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}
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LL query(int u, int l, int r) {
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if (l > tr[u].r || r < tr[u].l) return 0; // 递归出口，不在我管辖范围内的情况，返回0
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if (l <= tr[u].l && tr[u].r <= r) return tr[u].sum; // 完整区间覆盖，返回区间和
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// 没有完全命中，开始分裂
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pushdown(u);
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// 左边+右边
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return query(u << 1, l, r) + query(u << 1 | 1, l, r);
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}
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int main() {
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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 T;
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cin >> T;
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int cas = 1;
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while (T--) {
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cin >> n; // 线段的区间[1~n]
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memset(tr, 0, sizeof tr); // 因树状数组多次使用，每次需要清空
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bulid(1, 1, n); // 构建树状数组
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cin >> q;
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while (q--) {
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int l, r, d;
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cin >> l >> r >> d;
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modify(1, l, r, d);
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}
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printf("Case %d: The total value of the hook is %lld.\n", cas++, query(1, 1, n));
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}
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return 0;
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} |