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  • 整体二分QAQ

    POJ 2104 K-th Number

    时空隧道

    题意:

    给出一个序列,每次查询区间第k小

    分析:

    整体二分入门题?

    代码:

     1 #include<algorithm>
     2 #include<iostream>
     3 #include<cstring>
     4 #include<cstdio>
     5 //by NeighThorn
     6 #define inf 0x3f3f3f3f
     7 using namespace std;
     8 
     9 const int maxn=100000+5,maxm=5000+5;
    10 
    11 int n,m,a[maxn],ans[maxm],tr[maxn];
    12 
    13 struct M{
    14     int x,y,k,id,flag;    
    15     M(int a=0,int b=0,int c=0,int d=0,int e=0){
    16         x=a,y=b,k=c,id=d,flag=e;
    17     }
    18 }q[maxm+maxn],q1[maxm+maxn],q2[maxm+maxn];
    19 
    20 inline void add(int x,int y){
    21     for(;x<=n;x+=x&(-x))
    22         tr[x]+=y;    
    23 }
    24 
    25 inline int query(int x){
    26     int res=0;
    27     for(;x;x-=x&(-x))
    28         res+=tr[x];
    29     return res;    
    30 }
    31 
    32 inline void solve(int L,int R,int l,int r){
    33     if(L>R)
    34         return;
    35     if(l==r){
    36         for(int i=L;i<=R;i++)
    37             if(q[i].flag==2)
    38                 ans[q[i].id]=l;
    39         return;
    40     }
    41     int mid=(l+r)>>1,l1=0,l2=0;
    42     for(int i=L;i<=R;i++){
    43         if(q[i].flag==1){
    44             if(q[i].x<=mid)
    45                 add(q[i].id,1),q1[l1++]=q[i];
    46             else
    47                 q2[l2++]=q[i];
    48         }
    49         else{
    50             int lala=query(q[i].y)-query(q[i].x-1);
    51             if(lala>=q[i].k)
    52                 q1[l1++]=q[i];
    53             else
    54                 q[i].k-=lala,q2[l2++]=q[i];
    55         }    
    56     }
    57     for(int i=0;i<l1;i++)
    58         if(q1[i].flag==1)
    59             add(q1[i].id,-1);
    60     memcpy(q+L,q1,sizeof(q[0])*l1);
    61     memcpy(q+L+l1,q2,sizeof(q[0])*l2);
    62     solve(L,L+l1-1,l,mid);solve(L+l1,R,mid+1,r);
    63 }
    64 
    65 signed main(void){
    66     while(scanf("%d%d",&n,&m)!=EOF){
    67         memset(tr,0,sizeof(tr));
    68         for(int i=1;i<=n;i++){
    69             scanf("%d",&a[i]);
    70             q[i]=(M){a[i],1,0,i,1};
    71         }
    72         for(int i=1;i<=m;i++)
    73             scanf("%d%d%d",&q[i+n].x,&q[i+n].y,&q[i+n].k),q[i+n].id=i,q[i+n].flag=2;
    74         solve(1,n+m,-inf,inf);
    75         for(int i=1;i<=m;i++)
    76             printf("%d
    ",ans[i]);
    77     }
    78     return 0;    
    79 }

    BZOJ 1901: Zju2112 Dynamic Rankings

    时空隧道

    分析:

    和上一题一样,就是把修改操作拆成删除和插入操作...

    代码:

     1 #include<algorithm>
     2 #include<iostream>
     3 #include<cstring>
     4 #include<cstdio>
     5 //by NeighThorn
     6 #define inf 0x3f3f3f3f
     7 using namespace std;
     8  
     9 const int maxn=10000+5;
    10  
    11 int n,m,cnt,tot,tr[maxn],pre[maxn],ans[maxn];
    12  
    13 char ch[3];
    14  
    15 struct M{
    16     int x,y,k,id,flag;  
    17 }q[maxn*4],q1[maxn*4],q2[maxn*4];
    18  
    19 inline int read(void){
    20     char ch=getchar();int f=1,x=0;
    21     while(!(ch>='0'&&ch<='9')){
    22         if(ch=='-')
    23             f=-1;
    24         ch=getchar();
    25     }   
    26     while(ch>='0'&&ch<='9')
    27         x=x*10+ch-'0',ch=getchar();
    28     return x;
    29 }
    30  
    31 inline void insert(int x,int y){
    32     for(;x<=n;x+=x&(-x))
    33         tr[x]+=y;   
    34 }
    35  
    36 inline int query(int x){
    37     int res=0;
    38     for(;x;x-=x&(-x))
    39         res+=tr[x];
    40     return res; 
    41 }
    42  
    43 inline void solve(int L,int R,int l,int r){
    44     if(L>R)
    45         return;
    46     if(l==r){
    47         for(int i=L;i<=R;i++)
    48             if(q[i].flag==2)
    49                 ans[q[i].id]=l;
    50         return;
    51     }
    52     int mid=(l+r)>>1,l1=0,l2=0;
    53     for(int i=L;i<=R;i++){
    54         if(q[i].flag==1){
    55             if(q[i].x<=mid)
    56                 insert(q[i].id,q[i].y),q1[l1++]=q[i];
    57             else
    58                 q2[l2++]=q[i];
    59         }
    60         else{
    61             int lala=query(q[i].y)-query(q[i].x-1);
    62             if(lala>=q[i].k)
    63                 q1[l1++]=q[i];
    64             else
    65                 q[i].k-=lala,q2[l2++]=q[i]; 
    66         }
    67     }
    68     for(int i=0;i<l1;i++)
    69         if(q1[i].flag==1)
    70             insert(q1[i].id,-q1[i].y);
    71     memcpy(q+L,q1,sizeof(q[0])*l1);
    72     memcpy(q+L+l1,q2,sizeof(q[0])*l2);
    73     solve(L,L+l1-1,l,mid);solve(L+l1,R,mid+1,r);
    74 }
    75  
    76 signed main(void){
    77     n=read(),m=read();tot=n;
    78     for(int i=1;i<=n;i++)
    79         pre[i]=read(),q[i].x=pre[i],q[i].y=1,q[i].k=0,q[i].id=i,q[i].flag=1;
    80     for(int i=1,x,y;i<=m;i++){
    81         scanf("%s",ch);tot++;
    82         if(ch[0]=='Q')
    83             q[tot].x=read(),q[tot].y=read(),q[tot].k=read(),q[tot].id=++cnt,q[tot].flag=2;
    84         else
    85             x=read(),y=read(),q[tot].x=pre[x],q[tot].y=-1,q[tot].k=0,q[tot].id=x,q[tot].flag=1,
    86             pre[x]=y,q[++tot].x=y,q[tot].y=1,q[tot].k=0,q[tot].id=x,q[tot].flag=1;
    87     }
    88     solve(1,tot,0,inf);
    89     for(int i=1;i<=cnt;i++)
    90         printf("%d
    ",ans[i]);
    91     return 0;
    92 }//Cap ou pas cap. Cap.

     BZOJ 3110: [Zjoi2013]K大数查询

    时空隧道

    分析:

    还是一样的...只是把树状数组改成了线段树...

    然而...虽然题水...但是我WA了半页...快读写错了...没有读入负数

    代码:

      1 #include<algorithm>
      2 #include<iostream>
      3 #include<cstring>
      4 #include<cstdio>
      5 //by NeighThorn
      6 #define int long long 
      7 using namespace std;
      8  
      9 const int maxn=50000+5;
     10  
     11 int n,m,cnt,ans[maxn];
     12  
     13 struct M{
     14     int x,y,id,flag;    
     15     long long k;
     16 }q[maxn],q1[maxn],q2[maxn];
     17  
     18 struct Tree{
     19     int l,r;
     20     long long sum,lazy; 
     21 }tree[maxn<<2];
     22  
     23 inline long long longread(void){
     24     char ch=getchar();int f=1;long long x=0;
     25     while(!(ch>='0'&&ch<='9')){
     26         if(ch=='-')
     27             f=-1;
     28         ch=getchar();
     29     }    
     30     while(ch>='0'&&ch<='9')
     31         x=x*10+ch-'0',ch=getchar();
     32     return f*x;
     33 }
     34  
     35 inline int intread(void){
     36     char ch=getchar();int f=1,x=0;
     37     while(!(ch>='0'&&ch<='9')){
     38         if(ch=='-')
     39             f=-1;
     40         ch=getchar();
     41     }    
     42     while(ch>='0'&&ch<='9')
     43         x=x*10+ch-'0',ch=getchar();
     44     return f*x;
     45 }
     46  
     47 inline void build(int l,int r,int tr){
     48     tree[tr].l=l,tree[tr].r=r,tree[tr].sum=0,tree[tr].lazy=0;
     49     if(l==r)
     50         return;
     51     int mid=(l+r)>>1;
     52     build(l,mid,tr<<1),build(mid+1,r,tr<<1|1);
     53 }
     54  
     55 inline void change(int l,int r,int val,int tr){//cout<<l<<" "<<r<<"   "<<tree[tr].l<<" "<<tree[tr].r<<" "<<tr<<"   ";
     56     if(tree[tr].l==l&&tree[tr].r==r){
     57         tree[tr].sum+=val*(r-l+1);
     58         tree[tr].lazy+=val;return;  
     59     }
     60     int mid=(tree[tr].l+tree[tr].r)>>1;//cout<<mid<<endl;
     61     if(tree[tr].lazy)
     62         change(tree[tr].l,mid,tree[tr].lazy,tr<<1),change(mid+1,tree[tr].r,tree[tr].lazy,tr<<1|1),tree[tr].lazy=0;
     63     if(r<=mid)
     64         change(l,r,val,tr<<1);
     65     else if(l>mid)
     66         change(l,r,val,tr<<1|1);
     67     else
     68         change(l,mid,val,tr<<1),change(mid+1,r,val,tr<<1|1);
     69     tree[tr].sum=tree[tr<<1].sum+tree[tr<<1|1].sum;
     70 }
     71  
     72 inline long long query(int l,int r,int tr){//cout<<l<<" "<<r<<" "<<tree[tr].l<<" "<<tree[tr].r<<" "<<tr<<" ";
     73     if(tree[tr].l==l&&tree[tr].r==r)
     74         return tree[tr].sum;
     75     int mid=(tree[tr].l+tree[tr].r)>>1;//cout<<mid<<endl;
     76     if(tree[tr].lazy)
     77         change(tree[tr].l,mid,tree[tr].lazy,tr<<1),change(mid+1,tree[tr].r,tree[tr].lazy,tr<<1|1),tree[tr].lazy=0;
     78     if(r<=mid)
     79         return query(l,r,tr<<1);
     80     else if(l>mid)
     81         return query(l,r,tr<<1|1);
     82     else
     83         return query(l,mid,tr<<1)+query(mid+1,r,tr<<1|1);
     84 }
     85  
     86 inline void solve(int L,int R,int l,int r){//cout<<L<<" "<<R<<" "<<l<<" "<<r<<endl;
     87     if(L>R)
     88         return;
     89     if(l==r){
     90         for(int i=L;i<=R;i++)
     91             if(q[i].flag==2)
     92                 ans[q[i].id]=l;
     93         return; 
     94     }
     95     int mid=(l+r)>>1,l1=0,l2=0;
     96     for(int i=L;i<=R;i++){//cout<<i<<endl;
     97         if(q[i].flag==1){//cout<<"***"<<endl;
     98             if(q[i].k<=mid)
     99                 change(q[i].x,q[i].y,1,1),q1[l1++]=q[i];
    100             else
    101                 q2[l2++]=q[i];
    102         }
    103         else{//cout<<"&&&"<<endl;
    104             int lala=query(q[i].x,q[i].y,1);//cout<<q[i].x<<" "<<q[i].y<<" "<<lala<<" "<<tree[1].sum<<endl;
    105             if(lala>=q[i].k)
    106                 q1[l1++]=q[i];
    107             else
    108                 q[i].k-=lala,q2[l2++]=q[i];
    109         }
    110     }//cout<<"lala"<<endl;
    111     for(int i=0;i<l1;i++)
    112         if(q1[i].flag==1)
    113             change(q1[i].x,q1[i].y,-1,1);
    114 //  memcpy(q+L,q1,sizeof(q[0])*l1);
    115 //  memcpy(q+L+l1,q2,sizeof(q[0])*l2);
    116     for(int i=0;i<l1;i++)
    117         q[L+i]=q1[i];
    118     for(int i=0;i<l2;i++)
    119         q[L+l1+i]=q2[i];
    120     solve(L,L+l1-1,l,mid),solve(L+l1,R,mid+1,r);
    121 }
    122  
    123 signed main(void){
    124 //  freopen("sequence10.in","r",stdin);
    125 //  freopen("out.out","w",stdout); 
    126     n=intread();m=intread();cnt=0;
    127 //  scanf("%lld%lld",&n,&m);
    128     for(int i=1,l,s,x,y;i<=m;i++){
    129         l=intread();
    130 //      scanf("%lld",&l);
    131         if(l==1)
    132             q[i].x=intread(),q[i].y=intread(),q[i].k=longread(),q[i].k=n-q[i].k+1,q[i].flag=1;
    133         else
    134             q[i].x=intread(),q[i].y=intread(),q[i].k=longread(),q[i].id=++cnt,q[i].flag=2;
    135     }build(1,n,1);solve(1,m,1,n);
    136     for(int i=1;i<=cnt;i++)
    137         printf("%lld
    ",n-ans[i]+1);
    138     return 0;
    139 }//Cap ou pas cap. Cap.

     BZOJ 2527: [Poi2011]Meteors

    时空隧道

    还是板子题...感觉我要废了TAT...

    代码:

     1 #include<algorithm>
     2 #include<iostream>
     3 #include<cstring>
     4 #include<cstdio>
     5 #include<vector>
     6 //by NeighThorn
     7 using namespace std;
     8  
     9 const int maxn=300000+5;
    10  
    11 int n,m,k,cnt,ans[maxn],need[maxn];
    12  
    13 vector<int> v[maxn];
    14  
    15 unsigned long long tr[maxn];
    16  
    17 struct M{
    18     int x,y,k,id,flag;  
    19 }q[maxn<<2],q1[maxn<<2],q2[maxn<<2];
    20  
    21 inline void insert(int x,int y){
    22     for(;x<=m;x+=x&(-x))
    23         tr[x]+=y;   
    24 }
    25  
    26 inline unsigned long long query(int x){
    27     unsigned long long res=0;
    28     for(;x;x-=x&(-x))
    29         res+=tr[x];
    30     return res; 
    31 }
    32  
    33 inline void solve(int L,int R,int l,int r){
    34     if(L>R)
    35         return;
    36     if(l==r){
    37         for(int i=L;i<=R;i++)
    38             if(q[i].flag==2)
    39                 ans[q[i].id]=l;
    40         return;
    41     }
    42     int mid=(l+r)>>1,l1=0,l2=0;
    43     for(int i=L;i<=R;i++){
    44         if(q[i].flag==1){
    45             if(q[i].id<=mid)
    46                 insert(q[i].x,q[i].k),insert(q[i].y+1,-q[i].k),q1[l1++]=q[i];
    47             else
    48                 q2[l2++]=q[i];
    49         }
    50         else{
    51             unsigned long long lala=0;
    52             for(int j=0;j<v[q[i].id].size();j++)
    53                 lala+=query(v[q[i].id][j]);
    54             if(lala>=q[i].k)
    55                 q1[l1++]=q[i];
    56             else
    57                 q[i].k-=lala,q2[l2++]=q[i];
    58         }
    59     }
    60     for(int i=0;i<l1;i++)
    61         if(q1[i].flag==1)
    62             insert(q1[i].x,-q1[i].k),insert(q1[i].y+1,q1[i].k);
    63     for(int i=0;i<l1;i++)
    64         q[L+i]=q1[i];
    65     for(int i=0;i<l2;i++)
    66         q[L+l1+i]=q2[i];
    67     solve(L,L+l1-1,l,mid),solve(L+l1,R,mid+1,r);
    68 }
    69  
    70 signed main(void){
    71     scanf("%d%d",&n,&m);
    72     for(int i=1,x;i<=m;i++)
    73         scanf("%d",&x),v[x].push_back(i);
    74     for(int i=1;i<=n;i++)
    75         scanf("%d",&need[i]);
    76     scanf("%d",&k);
    77     for(int i=1,s,x,y;i<=k;i++){
    78         scanf("%d%d%d",&x,&y,&s);
    79         if(x<=y)
    80             q[++cnt].x=x,q[cnt].y=y,q[cnt].k=s,q[cnt].flag=1,q[cnt].id=i;
    81         else
    82             q[++cnt].x=x,q[cnt].y=m,q[cnt].k=s,q[cnt].flag=1,q[cnt].id=i,
    83             q[++cnt].x=1,q[cnt].y=y,q[cnt].k=s,q[cnt].flag=1,q[cnt].id=i;
    84     }
    85     for(int i=1;i<=n;i++)
    86         q[++cnt].k=need[i],q[cnt].id=i,q[cnt].flag=2;
    87     solve(1,cnt,1,k+1); 
    88     for(int i=1;i<=n;i++){
    89         if(ans[i]==k+1)
    90             puts("NIE");
    91         else
    92             printf("%d
    ",ans[i]);  
    93     }
    94     return 0;   
    95 }//Cap ou pas cap. Cap.
    96 

    By NeighThorn

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  • 原文地址:https://www.cnblogs.com/neighthorn/p/6259917.html
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