LA 4108 （线段树）

区间更新 + 统计更新长度

稍稍不注意就T了

#include<bits/stdc++.h>
#define lson l, m, rt<<1
#define rson m+1, r, rt<<1|1
using namespace std;
const int maxn = 100000 + 131;
int Ma[maxn<<2], Mi[maxn<<2], Lazy[maxn<<2];
int Cnt;

void PushUp(int rt)
{
    Ma[rt] = max(Ma[rt<<1], Ma[rt<<1|1]);
    Mi[rt] = min(Mi[rt<<1], Mi[rt<<1|1]);
}

void PushDown(int rt)
{
    if(Lazy[rt] != -1)
    {
        Lazy[rt<<1] = Lazy[rt<<1|1] = Lazy[rt];
        Ma[rt<<1] = Ma[rt<<1|1] = Lazy[rt];
        Mi[rt<<1] = Mi[rt<<1|1] = Lazy[rt];
        Lazy[rt] = -1;
    }
}

void Build(int l, int r, int rt)
{
    Ma[rt] = Mi[rt] = 0;
    Lazy[rt] = -1;
    if(l == r) return ;
    int m = (l + r) >> 1;
    Build(lson), Build(rson);
}

void Query(int L, int R, int val, int l,int r,int rt)
{
    ////////////////////////////////////
    if(L <= l && r <= R)
    {
        if(val < Mi[rt]) return ;
        if(val >= Ma[rt])
        {
            Ma[rt] = Mi[rt] = val;
            Lazy[rt] = val;
            Cnt += r - l + 1;
            return ;
        }
        if(l == r) return ;
    }
    ///////////////////////////////////////
    PushDown(rt);
    int m = (l + r) >> 1;
    if(L <= m) Query(L, R, val, lson);
    if(R > m)  Query(L, R, val, rson);
    PushUp(rt);
}

int main()
{
    int t;
    scanf("%d",&t);
    while(t--)
    {
        int n;
        scanf("%d",&n);
        Cnt = 0;
        Build(1,100000,1);
        int l, r, val;
        for(int i = 0; i < n; ++ i)
        {
            scanf("%d%d%d",&l,&r,&val);
            r--;
            Query(l,r,val,1,100000,1);
        }
        printf("%d\n",Cnt);
    }
    return 0;
}