线段树区间加板子

#include<stdio.h>
#include<iostream>
#include<string.h>
#include<algorithm>
#include<queue>
#include<string>
using namespace std;
#define maxn 101000
#define maxq 101000
int Sum[maxn << 2];
int Add[maxn << 2];
int n, t, q;
int a, b, c;
int ans;

void pushup(int rt) {
	Sum[rt] = Sum[rt << 1] + Sum[rt << 1 | 1];
}
void pushdown(int rt,int ln,int rn) {
	if (Add[rt]) {
		Add[rt << 1] = Add[rt << 1 | 1] = Add[rt];
		Sum[rt << 1] = ln*Add[rt];
		Sum[rt << 1 | 1] = rn*Add[rt];
		Add[rt] = 0;
	}
}
void build(int l, int r, int rt) {
	Add[rt] = 0;
	Sum[rt] = 1;
	if (l == r) { return; }
	int m = (l + r) >> 1;
	build(l, m, rt << 1);
	build(m + 1, r, rt << 1 | 1);
}
void update(int a, int b, int c, int l, int r, int rt) {
	//cout << l << " " << r << " " << rt << endl;
	if (a <= l&&b >= r) {
		Add[rt] = c;
		Sum[rt] = c*(r - l + 1);
		return;
	}
	int m = (r + l) >> 1;
	pushdown(rt, m - l + 1, r - m);
	if (a <= m)update(a, b, c, l, m, rt << 1);
	if (b > m)update(a, b, c, m + 1, r, rt << 1 | 1);
	pushup(rt);
}
int main() {
	scanf("%d", &t);
	int cnt = 0;
	while (t--) {
		cnt++;
		scanf("%d", &n);
		build(1, n, 1);
		scanf("%d", &q);
		while (q--) {
			scanf("%d %d %d", &a, &b, &c);
			update(a, b, c, 1, n, 1);
		}
		ans = 0;
		printf("Case %d: The total value of the hook is %d.
", cnt, Sum[1]);
	}
}