hiho1080 more sophisticated buying and selling house posture

Topic Links:

hihocoder1080

Solution:

There are two actions for interval modification in the topic:

0 interval All points increased V

1 All points in the interval are changed to V

Easy to think of should use to two lazy mark a record to replace a record increase or decrease

But there's a sequential problem here, and there's a strategy for lazy tagging to take into account:

If a replacement tag appears, you should overwrite the increment and decrement mark

If multiple increment and decrement markers appear in the same interval, the markers need to be superimposed

Code:

#include <iostream> #include <cstdio> #include <cstring> #define Lson l,m,rt<<1#define Rson m+1, R,rt<<1|1#define maxn 100050using namespace Std;int w[maxn<<2];int tag[maxn<<2][2]= {0};void push_up (int RT) {w[rt]=w[rt<<1]+w[rt<<1|1];} void Push_down (int rt,int len) {if (tag[rt][1])//replace tag {tag[rt<<1][1]=tag[rt<<1|1][1        ]=TAG[RT][1];      tag[rt<<1][0]=tag[rt<<1|1][0]=0;        0 w[rt<<1]= (len-(len>>1)) *tag[rt][1] for the increase or decrease of child nodes;        w[rt<<1|1]= (len>>1) *tag[rt][1];    tag[rt][1]=0;         } if (Tag[rt][0])//increment/decrement tag {tag[rt<<1][0]+=tag[rt][0];         Overlay is + = Not =!!!       tag[rt<<1|1][0]+=tag[rt][0];        Overlay w[rt<<1]+= (len-(len>>1)) *tag[rt][0];        w[rt<<1|1]+= (len>>1) *tag[rt][0];    tag[rt][0]=0;    }}void Build (int l,int R,int RT) {if (l==r) scanf ("%d", &w[rt]); Else    {int m= (L+R) >>1;        Build (Lson);        Build (Rson);    PUSH_UP (RT);            }}void Update (int op,int l,int r,int v,int l,int r,int RT) {if (l<=l&&r>=r) {if (OP) {            w[rt]= (r-l+1) *v;            Tag[rt][1]=v;             tag[rt][0]=0;         Add or subtract Mark 0} else {w[rt]+= (r-l+1) *v;        Overlay Tag[rt][0]+=v;    } return;    } push_down (rt,r-l+1);    int m= (L+R) >>1;    if (l<=m) update (Op,l,r,v,lson);    if (r>m) update (Op,l,r,v,rson);  PUSH_UP (RT);}    int main () {int n,q,op,l,r,v;    scanf ("%d%d", &n,&q);    Build (0,n,1);        while (q--) {scanf ("%d%d%d%d", &op,&l,&r,&v);        Update (op,l,r,v,0,n,1);    printf ("%d\n", w[1]); } return 0;}

hiho1080 more sophisticated buying and selling house posture