Codevs 1690 Switch Light segment tree + delay marker

1690 Switch Lighttime limit: 1 sspace limit: 128000 KBTitle Description Description

Yyx House in front of the street has N (2<=n<=100000) lamp, before six o'clock in the evening, these lights are all closed, after six points, there will be M (2<=m<=100000) Individual press the switch, These switches can change the status of the light from the I lamp to the J lamp, and now Yyx want to know how much light is on from the X lamp to the y lamp (1<=i,j,x,y<=n)

Enter a description Input DescriptionLine 1th: Two integers separated by spaces N and M 2..m+1: Each line represents an action, there are three integers separated by spaces: instruction Number (0 for press switch, 1 for inquiry status), x and Y output description Output Description

1th. Total number of queries: For each query, the result of the output query

Sample input Sample Input

4 5
0 1 2
0 2 4
1 2 3
0 2 4
1 1 4

Sample output Sample Output1
2 Data range and hints Data Size & Hint

There are 4 lights, 5 operations, the following is the status of each operation (x for closed, O for open):

Ooxx, Oxoo, XXXX---Ooxx inquiry 1~4

Idea: Segment tree into paragraph update, each time an interval changed to turn off the number of lights, each module 2 can be;

#include <bits/stdc++.h>using namespacestd;#definell Long Long#defineMoD 1000000007#definePi (4*atan (1.0))Const intn=4e3+Ten, m=1e6+Ten, inf=1e9+Ten;intSum[m];intFlag[m];voidPushdown (intPosintLen) {    intlson=pos*2; intrson=pos*2+1; if(Flag[pos]) {Flag[lson]+=Flag[pos]; Flag[lson]%=2; Flag[rson]+=Flag[pos]; Flag[rson]%=2; Flag[pos]=0; Sum[lson]= (len-(len>>1))-Sum[lson]; Sum[rson]= (len>>1)-Sum[rson]; }}voidBuildtree (intLintRintPOS) {    if(l==R) {Sum[pos]=0; Flag[pos]=0; return; }    intMid= (l+r) >>1; Buildtree (L,mid,pos*2); Buildtree (Mid+1, r,pos*2+1);}intQueryintLintRintLintRintPOS) {    if(l<=l&&r<=R)returnSum[pos]; Pushdown (POS, (R-l+1)); intMid= (l+r) >>1; intans=0; if(L<=mid) Ans+=query (l,r,l,mid,pos*2); if(mid<r) Ans+=query (l,r,mid+1, r,pos*2+1); returnans;}voidUpdateintLintRintChangeintLintRintPOS) {    if(l<=l&&r<=R) {Flag[pos]+=Change ; Flag[pos]%=2; Sum[pos]= (r-l+1)-Sum[pos]; return; } pushdown (Pos,r-l+1); intMid= (L+R)/2; if(l<=mid) Update (l,r,change,l,mid,pos*2); if(r>mid) Update (l,r,change,mid+1, r,pos*2+1); Sum[pos]=sum[pos*2]+sum[pos*2+1];}intMain () {intx,y,z,i,t;  while(~SCANF ("%d%d",&x,&y)) { for(i=0; i<y;i++)        {            intFlag,l,r; scanf ("%d%d%d",&flag,&l,&R); if(flag) {printf ("%d\n", Query (L,r,1X1)); }            Else{update (l,r,1,1X1); }        }    }    return 0;}

Codevs 1690 Switch Light segment tree + delay marker