整体二分（SP3946 K-th Number ZOJ 2112 Dynamic Rankings）

SP3946 K-th Number

（/2和>>1不一样！！）

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>

#if __cplusplus >= 201103L
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#endif
#define INF 1000000007
#define MAXN 200010
using namespace std;
struct Node {
    int x,y,a,b,c;
}q[MAXN],a[MAXN],b[MAXN];
int t[MAXN],ans[MAXN],n,m,x,y,z,cnt,k;
inline int read() {
    char ch;
    bool f=false;
    int res=0;
    while (((ch=getchar())<'0'||ch>'9')&&ch!='-');
    if (ch=='-')
        f=true;
    else
        res=ch-'0';
    while ((ch=getchar())>='0'&&ch<='9')
        res=(res<<3)+(res<<1)+ch-'0';
    return f?~res+1:res;
}
inline int lowbit(int x) {
    return x&(-x);
}
inline void add(int x,int y) {
    while (x<=n) {
        t[x]+=y,x+=lowbit(x);
    }
}
inline int sum(int x) {
    int summ=0;
    while (x>0) {
        summ+=t[x],x-=lowbit(x);
    }
    return summ;
}
inline void Build(int x,int i){
    cnt++;
    q[cnt].x=x,q[cnt].b=1,q[cnt].c=i;
}
inline void Build1(int x,int y,int k,int i){
    cnt++;
    q[cnt].x=x,q[cnt].y=y,q[cnt].a=k,q[cnt].b=2,q[cnt].c=i;
}
void sc(int t,int w,int l,int r) {
    if (t>=w)
        return;
    if (l==r) {
        for (int i=t;i<=w;++i)
            if (q[i].b==2)
                ans[q[i].c]=l;
        return;
    }
    int mid=(l+r)>>1,t1=0,w1=0;
    for (int i=t;i<=w;++i)
        if (q[i].b==1) {
            if (q[i].x<=mid)
                add(q[i].c,1),a[++t1]=q[i];
            else
                b[++w1]=q[i];
        }
        else {
            int tw=sum(q[i].y)-sum(q[i].x-1);
            if (tw>=q[i].a)
                a[++t1]=q[i];
            else {
                q[i].a=q[i].a-tw;
                b[++w1]=q[i];
            }
        }
    for (int i=1;i<=t1;++i)
        if (a[i].b==1)
            add(a[i].c,-1);
    for (int i=1;i<=t1;++i)
        q[t+i-1]=a[i];
    for (int i=1;i<=w1;++i)
        q[t+t1+i-1]=b[i];
    sc(t,t+t1-1,l,mid);
    sc(t+t1,w,mid+1,r);
}
int main() {
    n=read(),m=read();
    for (int i=1;i<=n;++i) {
        x=read();
        Build(x,i);
    }
    for (int i=1;i<=m;++i) {
        x=read(),y=read(),k=read();
        Build1(x,y,k,i);
    }
    sc(1,cnt,-INF,INF);
    for (int i=1;i<=m;++i)
        printf("%d\n",ans[i]);
    return 0;
}

ZOJ 2112 Dynamic Rankings

#include <algorithm>
#include <bitset>
#include <complex>
#include<cstring>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>

#if __cplusplus >= 201103L
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#endif
#define INF 1000000007
#define MAXN 2000010
using namespace std;
struct Node {
    int x,y,a,b,c;
}q[MAXN],a[MAXN],b[MAXN];
int t[MAXN],ans[MAXN],n,m,x,y,z,cnt,k;
int aa[MAXN];
char ch;
int ansn;
inline int read() {
    char ch;
    bool f=false;
    int res=0;
    while (((ch=getchar())<'0'||ch>'9')&&ch!='-');
    if (ch=='-')
        f=true;
    else
        res=ch-'0';
    while ((ch=getchar())>='0'&&ch<='9')
        res=(res<<3)+(res<<1)+ch-'0';
    return f?~res+1:res;
}
inline int lowbit(int x) {
    return x&(-x);
}
inline void add(int x,int y) {
    while (x<=n) {
        t[x]+=y,x+=lowbit(x);
    }
}
inline int sum(int x) {
    int summ=0;
    while (x>0) {
        summ+=t[x],x-=lowbit(x);
    }
    return summ;
}
inline void Build(int x,int i) {
    cnt++;
    q[cnt].x=x,q[cnt].b=1,q[cnt].c=i;
}
inline void Build1(int x,int y,int k,int i) {
    cnt++,ansn++;
    q[cnt].x=x,q[cnt].y=y,q[cnt].a=k,q[cnt].b=0,q[cnt].c=ansn;
}
inline void Build2(int x,int y,int i) {
    cnt++;
    q[cnt].x=aa[x],q[cnt].b=-1,q[cnt].c=x;
}
inline void Build3(int x,int y,int i) {
    cnt++;
    q[cnt].x=aa[x],q[cnt].b=1,q[cnt].c=x;
}
void sc(int t,int w,int l,int r) {
    if (t>w)
        return;
    if (l==r) {
        for (int i=t;i<=w;++i)
            if (q[i].b==0)
                ans[q[i].c]=l;
        return;
    }
    int mid=(l+r)>>1,t1=0,w1=0;
    for (int i=t;i<=w;++i)
        if (q[i].b) {
            if (q[i].x<=mid)
                /*add(q[i].c,1),*/add(q[i].c,q[i].b),a[++t1]=q[i];
            else
                b[++w1]=q[i];
        }
        else {
            int tw=sum(q[i].y)-sum(q[i].x-1);
            if (tw>=q[i].a)
                a[++t1]=q[i];
            else {
                q[i].a=q[i].a-tw;
                b[++w1]=q[i];
            }
        }
    for (int i=1;i<=t1;++i)
        if (a[i].b)
            add(a[i].c,-a[i].b);
    for (int i=1;i<=t1;++i)
        q[t+i-1]=a[i];
    /*for (int i=1;i<=t1;++i)
        printf("%d %d %d %d %d ",a[i].x,a[i].y,a[i].a,a[i].b,a[i].c);
    printf("\n");*/
    for (int i=1;i<=w1;++i)
        q[t+t1+i-1]=b[i];
    sc(t,t+t1-1,l,mid);
    sc(t+t1,w,mid+1,r);
}
int main() {
    int T=read();
    while (T--){
        memset(q,0,sizeof q);
        memset(a,0,sizeof a);
        memset(b,0,sizeof b);
        memset(ans,0,sizeof ans);
        n=read(),m=read(),cnt=0,ansn=0;
        for (int i=1;i<=n;++i) {
            aa[i]=read();
            Build(aa[i],i);
        }
        for (int i=1;i<=m;++i) {
            /*scanf("%c",&ch);*/cin>>ch;x=read(),y=read();
            if (ch=='Q'){
                k=read();
                Build1(x,y,k,i);
            }
            else {
                Build2(x,y,i);
                aa[x]=y;
                Build3(x,y,i);
            }
        }
        //for (int i=1;i<=cnt;++i)
        //    printf("%d %d %d %d %d\n",q[i].x,q[i].y,q[i].a,q[i].b,q[i].c);
        sc(1,cnt,-INF,INF);
        for (int i=1;i<=ansn;++i)
            printf("%d\n",ans[i]);
    }
    return 0;
}