• day 1 晚上 P2824 [HEOI2016/TJOI2016]排序 线段树


      1 #include<iostream>
      2 #include<cstdio>
      3 #include<cstdlib>
      4 #include<cmath>
      5 #include<cstring>
      6 using namespace std;
      7 const int maxn=1e6+10;
      8 
      9 struct node
     10 {
     11     int l;
     12     int r;
     13     int value;
     14     int lazy;
     15 }tree[maxn];
     16 int q;
     17 struct tre
     18 {
     19     int a,b,c;
     20 }o[maxn];
     21 int n,m;
     22 int lllll;
     23 int a[maxn];
     24 void pushup(int  x)
     25 {
     26     tree[x].value=tree[x<<1].value+tree[x<<1|1].value;
     27 }
     28 
     29 void pushdown(int x)
     30 {
     31     if(tree[x].lazy!=-1)
     32     {
     33         tree[x<<1].lazy=tree[x].lazy;
     34         tree[x<<1|1].lazy=tree[x].lazy;
     35         tree[x<<1].value=(tree[x<<1].r-tree[x<<1].l+1)*tree[x].lazy;
     36         tree[x<<1|1].value=(tree[x<<1|1].r-tree[x<<1|1].l+1)*tree[x].lazy;
     37         tree[x].lazy=-1;
     38     }
     39     if(tree[x].l<tree[x].r)
     40     {
     41         pushup(x);
     42     }
     43 }
     44 void build(int x,int l,int r)
     45 {
     46     tree[x].l=l;
     47     tree[x].r=r;
     48     tree[x].lazy=-1;
     49     if(l==r)
     50     {
     51         tree[x].value=a[l]>lllll;
     52         return ;
     53     }
     54     int mid=(l+r)>>1;
     55     build(x<<1,l,mid);
     56     build(x<<1|1,mid+1,r);
     57     pushup(x);
     58 }
     59 int query(int x,int ls,int rs)
     60 {
     61     int l=tree[x].l;
     62     int r=tree[x].r;
     63     int mid=(l+r)>>1;
     64     pushdown(x);
     65     if(ls<=l&&r<=rs)
     66     {
     67         return tree[x].value;
     68     }
     69     int ans=0;
     70     if(ls<=mid)
     71     {
     72         ans+=query(x<<1,ls,rs);
     73     }
     74     if(rs>mid)
     75     {
     76         ans+=query(x<<1|1,ls,rs);
     77     }
     78     return ans;
     79 }
     80 void modify(int x,int ls,int rs,int c)
     81 {
     82     int l=tree[x].l;
     83     int r=tree[x].r;
     84     int mid=(l+r)>>1;
     85     pushdown(x);
     86     if(ls<=l&&r<=rs)
     87     {
     88         tree[x].value=(r-l+1)*c;
     89         tree[x].lazy=c;
     90         return ;
     91     }
     92     if(ls<=mid)
     93     {
     94         modify(x<<1,ls,rs,c);
     95         
     96     }
     97     if(rs>mid)
     98     {
     99         modify(x<<1|1,ls,rs,c);
    100     }
    101     pushup(x);
    102 }
    103 bool check(int x)
    104 {
    105     lllll=x;
    106     build(1,1,n);
    107     for(int i=1;i<=m;i++)
    108     {
    109         int opt=o[i].a;
    110         int x=o[i].b;
    111         int y=o[i].c;
    112         int tmp=query(1,x,y);
    113         if (opt == 0) 
    114         {
    115               modify(1,x,y-tmp,0);
    116               modify(1,y-tmp+1,y,1);
    117         }
    118         else
    119         {
    120               modify(1,x,x+tmp-1,1);
    121               modify(1,x+tmp,y,0);
    122         }
    123     }
    124     return !query(1,q,q);
    125 }
    126 int main()
    127 {
    128     cin>>n>>m;
    129     for(int i=1;i<=n;i++)
    130     {
    131         cin>>a[i];
    132     }
    133     for(int i=1;i<=m;i++)
    134     {
    135         cin>>o[i].a>>o[i].b>>o[i].c;
    136     }
    137     cin>>q;
    138     int l=1;
    139     int r=n;
    140     while(l<r)
    141     {
    142         int mid=l+(r-l)/2;
    143         if(check(mid))
    144         {
    145             r=mid;
    146         }
    147         else
    148         {
    149             l=mid+1;
    150         }
    151     }
    152     cout<<r<<endl;
    153     return 0;
    154 }
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  • 原文地址:https://www.cnblogs.com/2529102757ab/p/11224809.html
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