单点更新,区间最小值
#include <bits/stdc++.h>
using namespace std;
#define INF 0x3f3f3f3f
#define TREE_SIZE (1<<(20))
//#define local
class IntervalTree
{
private:
// Top 重要
int Top[TREE_SIZE];
int size;
int _Query(int a,int b,int l,int r,int Ind)
{
if(a<=l&& b>=r)return Top[Ind];
int mid=(l+r)>>1,ret=INF;
if(a<=mid) ret=min(ret,_Query(a,b,l,mid,Ind<<1));
if(b>mid) ret=min(ret,_Query(a,b,mid+1,r,(Ind<<1)+1));
return ret;
}
void _Modify(int a,int l,int r,int Ind,int d)
{
if(l==r && l==a)
{
Top[Ind]=d;
return ;
}
int mid=(l+r)>>1;
if(a<=mid) _Modify(a,l,mid,Ind<<1,d);
else _Modify(a,mid+1,r,(Ind<<1)+1,d);
Top[Ind]=min(Top[Ind<<1],Top[(Ind<<1)+1]);
}
public:
IntervalTree()
{
//memset(Cover,INF,sizeof(Cover));
memset(Top,INF,sizeof(Top));
size=(TREE_SIZE>>2)-1;
}
IntervalTree(int size):size(size)
{
//memset(Cover,INF,sizeof(Cover));
memset(Top,INF,sizeof(Top));
}
int Query(int a,int b)
{
return _Query(a,b,1,size,1);
}
void Modify(int a,int d)
{
return _Modify(a,1,size,1,d);
}
}it;
int main()
{
#ifdef LOCAL
freopen("a.txt", "r", stdin);
#endif
//IntervalTree (*it)=new IntervalTree(7);
(it).Modify(1,2);
(it).Modify(2,8);
(it).Modify(3,4);
(it).Modify(4,1);
(it).Modify(5,6);
(it).Modify(6,7);
(it).Modify(7,3);
cout<<(it).Query(5,6)<<endl;
cout<<(it).Query(3,4)<<endl;
cout<<(it).Query(1,7)<<endl;
cout<<(it).Query(1,3)<<endl;
fclose(stdin);
return 0;
}
单点更新,区间最大值
#include <bits/stdc++.h>
using namespace std;
#define INF 0x3f3f3f3f
#define TREE_SIZE (1<<(20))
//#define local
class IntervalTree
{
private:
// Top 重要
int Top[TREE_SIZE];
int size;
int _Query(int a,int b,int l,int r,int Ind)
{
if(a<=l&& b>=r)return Top[Ind];
int mid=(l+r)>>1,ret=0;
if(a<=mid) ret=max(ret,_Query(a,b,l,mid,Ind<<1));
if(b>mid) ret=max(ret,_Query(a,b,mid+1,r,(Ind<<1)+1));
return ret;
}
void _Modify(int a,int l,int r,int Ind,int d)
{
if(l==r && l==a)
{
Top[Ind]=d;
return ;
}
int mid=(l+r)>>1;
if(a<=mid) _Modify(a,l,mid,Ind<<1,d);
else _Modify(a,mid+1,r,(Ind<<1)+1,d);
Top[Ind]=max(Top[Ind<<1],Top[(Ind<<1)+1]);
}
public:
IntervalTree()
{
//memset(Cover,0,sizeof(Cover));
memset(Top,0,sizeof(Top));
size=(TREE_SIZE>>2)-1;
}
IntervalTree(int size):size(size)
{
//memset(Cover,0,sizeof(Cover));
memset(Top,0,sizeof(Top));
}
int Query(int a,int b)
{
return _Query(a,b,1,size,1);
}
void Modify(int a,int d)
{
return _Modify(a,1,size,1,d);
}
}it;
int main()
{
#ifdef LOCAL
freopen("a.txt", "r", stdin);
#endif
//IntervalTree (*it)=new IntervalTree(7);
(it).Modify(1,2);
(it).Modify(2,8);
(it).Modify(3,4);
(it).Modify(4,1);
(it).Modify(5,6);
(it).Modify(6,7);
(it).Modify(7,3);
cout<<(it).Query(5,6)<<endl;
cout<<(it).Query(3,4)<<endl;
cout<<(it).Query(1,7)<<endl;
cout<<(it).Query(1,3)<<endl;
fclose(stdin);
return 0;
}
单点更新,区间求和
#include <bits/stdc++.h>
using namespace std;
#define INF 0x3f3f3f3f
#define TREE_SIZE (1<<(20))
//#define local
class IntervalTree
{
private:
// Top 重要
int Top[TREE_SIZE];
int size;
int _Query(int a,int b,int l,int r,int Ind)
{
if(a<=l&& b>=r)return Top[Ind];
int mid=(l+r)>>1,ret=0;
if(a<=mid) ret+=_Query(a,b,l,mid,Ind<<1);
if(b>mid) ret+=_Query(a,b,mid+1,r,(Ind<<1)+1);
return ret;
}
void _Modify(int a,int l,int r,int Ind,int d)
{
if(l==r && l==a)
{
Top[Ind]=d;
return ;
}
int mid=(l+r)>>1;
if(a<=mid) _Modify(a,l,mid,Ind<<1,d);
else _Modify(a,mid+1,r,(Ind<<1)+1,d);
Top[Ind]=Top[Ind<<1]+Top[(Ind<<1)+1];
}
public:
IntervalTree()
{
//memset(Cover,0,sizeof(Cover));
memset(Top,0,sizeof(Top));
size=(TREE_SIZE>>2)-1;
}
IntervalTree(int size):size(size)
{
//memset(Cover,0,sizeof(Cover));
memset(Top,0,sizeof(Top));
}
int Query(int a,int b)
{
return _Query(a,b,1,size,1);
}
void Modify(int a,int d)
{
return _Modify(a,1,size,1,d);
}
}it;
int main()
{
#ifdef LOCAL
freopen("a.txt", "r", stdin);
#endif
//IntervalTree (*it)=new IntervalTree(7);
(it).Modify(1,2);
(it).Modify(2,8);
(it).Modify(3,4);
(it).Modify(4,1);
(it).Modify(5,6);
(it).Modify(6,7);
(it).Modify(7,3);
cout<<(it).Query(5,6)<<endl;
cout<<(it).Query(3,4)<<endl;
cout<<(it).Query(1,7)<<endl;
cout<<(it).Query(1,3)<<endl;
fclose(stdin);
return 0;
}
区间替换,区间求和
#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
const int MAX=1008600;
int sum[MAX<<2],flag[MAX<<2];
inline void PushUp(int idx)
{
sum[idx]=sum[idx<<1]+sum[idx<<1|1];
}
void Build(int idx,int left,int right)
{
// flag : -1表示没有懒惰标记
flag[idx]=-1;
if(left==right)
{
scanf("%d",sum+idx);
return ;
}
int mid=(left+right)>>1;
Build(idx<<1,left,mid);
Build(idx<<1|1,mid+1,right);
PushUp(idx);
}
// 懒惰标记的‘下放操作’
inline void PushDown(int idx,int left,int mid)
{
int L=idx<<1,R=L+1;
sum[L]=(mid-left+1)*flag[idx];
sum[R]=sum[idx]-sum[L];
flag[L]=flag[R]=flag[idx];
flag[idx]=-1;
}
int L,R,val;
void Update(int idx,int left,int right)
{
if(L<=left && right<=R)
{
sum[idx]=(right-left+1)*val;
// 放置懒惰标记
flag[idx]=val;
return;
}
int mid=(left+right)>>1;
if(flag[idx]!=-1) PushDown(idx,left,mid);
if(L<=mid) Update(idx<<1,left,mid);
if(mid<R) Update(idx<<1|1,mid+1,right);
PushUp(idx);
}
int Query(int idx,int left,int right)
{
if(L<=left && right<=R)
return sum[idx];
int mid=(left+right)>>1,ans=0;
if(flag[idx]!=-1) PushDown(idx,left,mid);
if(L<=mid) ans+=Query(idx<<1,left,mid);
if(mid<R) ans+=Query(idx<<1|1,mid+1,right);
return ans;
}
int main()
{
//freopen("test.txt","r",stdin);
int N,i,M;
scanf("%d",&N);
Build(1,1,N);
scanf("%d",&M);
while(M--)
{
scanf("%d%d%d",&i,&L,&R);
if(i)
{
scanf("%d",&val);
Update(1,1,N);
}
else printf("%d
",Query(1,1,N));
}
return 0;
}
区间更新(加上一个数字),区间求和
// 线段树_区间修改区间求和
#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
const int MAX=1008600;
int sum[MAX<<2],flag[MAX<<2];
inline void PushUp(int idx){
sum[idx]=sum[idx<<1]+sum[idx<<1|1];
}
void Build(int idx,int left,int right){
// flag : -1表示没有懒惰标记
flag[idx]=-1;
if(left==right)
{
scanf("%d",sum+idx); return ;
}
int mid=(left+right)>>1;
Build(idx<<1,left,mid);
Build(idx<<1|1,mid+1,right);
PushUp(idx);
}
// 懒惰标记的‘下放操作’
inline void PushDown(int idx,int left,int mid){
int L=idx<<1,R=L+1;
sum[L]=(mid-left+1)*flag[idx];
sum[R]=sum[idx]-sum[L];
flag[L]=flag[R]=flag[idx];
flag[idx]=-1;
}
int L,R,val;
void Update(int idx,int left,int right){
if(L<=left && right<=R){
sum[idx]+=(right-left+1)*val;
// 放置懒惰标记
flag[idx]+=val;
return;
}
int mid=(left+right)>>1;
if(flag[idx]!=-1) PushDown(idx,left,mid);
if(L<=mid) Update(idx<<1,left,mid);
if(mid<R) Update(idx<<1|1,mid+1,right);
PushUp(idx);
}
int Query(int idx,int left,int right){
if(L<=left && right<=R)
return sum[idx];
int mid=(left+right)>>1,ans=0;
if(flag[idx]!=-1) PushDown(idx,left,mid);
if(L<=mid) ans+=Query(idx<<1,left,mid);
if(mid<R) ans+=Query(idx<<1|1,mid+1,right);
return ans;
}
int main()
{
freopen("C:\Users\ssw\Desktop\test.txt","r",stdin);
int N,i,M;
scanf("%d",&N);
Build(1,1,N);
scanf("%d",&M);
while(M--){
scanf("%d%d%d",&i,&L,&R);
if(i){
scanf("%d",&val);
Update(1,1,N);
}
else printf("%d
",Query(1,1,N));
}
fclose(stdin);
return 0;
}