青岛2017icpc网络赛补题开坑

A.Apple

  计算几何+高精度(不会写JAVA的我瑟瑟发抖),网络赛的时候拿板子过的,做法是判断内角和加上一些细节处理

B.Bomberman

  注意到一个炸弹爆炸之后,整个环就变成了一条链,然后可以进行dp,注意到8*H个点中只有8个特殊的点(会只炸掉4个格子,事实上8个特殊的点分为两种特殊的点),其他格子事实上是等价的,所以状态只要记录剩余格子数和最近的特殊格子位置即可,用dp[start][n]记录从start开始(0<=start<=2*H-1),还剩余n个格子时炸弹期望,进行暴力dp

  总的时间复杂度小于128e,于是打表——由于对称性,可以只打1/8左右的表(否则文件太大了无法提交)

  打表程序:

 

#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<=b;++i)
int T,H;
double dp[200][200][1000];

void show(int H)
{
    int tp=0,tpn=0;
    rep(i,0,H)
    {
        if (i==2*H-1) tp=2;
            else tp=3;
        if (i==1 || i==2*H-1) tpn=4;
            else tpn=5;
        //cout<<(i+tp)%(2*H)<<" "<<8*H-tpn<<endl;
        printf("%.6f,",dp[H][(i+tp)%(2*H)][8*H-tpn]+1);
    }
    double ans=0;
    rep(i,0,2*H-1)
    {
        if (i==2*H-1) tp=2;
            else tp=3;
        if (i==1 || i==2*H-1) tpn=4;
            else tpn=5;
        //cout<<(i+tp)%(2*H)<<" "<<8*H-tpn<<endl;
        ans=ans+dp[H][(i+tp)%(2*H)][8*H-tpn]+1;
    }
    ans/=(2*H);
    printf("%.6f,",ans);
}

int main()
{
    freopen("1.out","w",stdout);
    //scanf("%d",&T);

    rep(H,4,100)
    {
        rep(n,1,8*H-4)
            rep(st,0,2*H-1)
            {
                dp[H][st][n]=0;
                rep(x,st,st+n-1)
                {
                    if (x%(2*H)==1)
                        dp[H][st][n]+=(1.0/n)*(dp[H][st][max(x-2-st+1,0)]+dp[H][4][max(n-(x+3-st),0)]+1);
                    else if(x%(2*H)==2*H-1)
                        dp[H][st][n]+=(1.0/n)*(dp[H][st][max(x-3-st+1,0)]+dp[H][1][max(n-(x+2-st),0)]+1);
                    else dp[H][st][n]+=(1.0/n)*(dp[H][st][max(x-3-st+1,0)]+dp[H][(x+3)%(2*H)][max(n-(x+3-st),0)]+1);
                    //if (st==0 && n==1)cout<<st<<" "<<n<<" "<<dp[H][st][n]<<endl;
                }
                //cout<<st<<" "<<n<<" "<<dp[H][st][n]<<endl;
            }
        show(H);
    }
    return 0;
}

 

    AC程序:

#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<=b;++i)
int T,n;
const double 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double ans[200][400];
int tot;
int main()
{
    tot=0;
    rep(H,4,100)
    {
        ans[H][2*H]=0;
        rep(i,0,H) ans[H][i]=db[tot++];
        rep(i,H+1,2*H-1) ans[H][i]=ans[H][2*H-i];
        ans[H][2*H]=db[tot++];
    }
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n);
        printf("%.6f\n",ans[n][2*n]);
        rep(k,0,3)
            rep(i,0,2*n-1) printf("%.6f ",ans[n][i]);
        printf("\n");
    }
    return 0;
}

 

 

C.The Dominator of Strings

  AC自动机模板题,网络赛板子过

D.The Intersection

E.King's Visit

F.Pythagoras

  队友已补,找时间看看

G.Zuma

  POJ2915弱化版,赛后补了原题,博客中有

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>
using namespace std;
#define rep(i,a,b) for(int i=a;i<=b;++i)
struct AA{
    int num,col;
}A[300];
int T,m,tot,l;
int dp[210][210][50][2];
char S[300];

inline int cost(int x,int y)
{
    if (x>=m && y==0) return 1;
    if (x+y>=m) return 0;
    return m-x-y;
}


int main()
{
    scanf("%d",&T);
    m=3;getchar();
    rep(t,1,T)
    {
        //getchar();
        gets(S);
        l=strlen(S);tot=0;
        A[++tot].col=S[0];A[tot].num=1;
        rep(i,1,l-1) if (S[i]!=A[tot].col)
        {
            A[++tot].col=S[i];
            A[tot].num=1;
        }else ++A[tot].num;
        rep(i,1,tot) if (A[i].num>=m) A[i].num=m-1;
        rep(i,1,tot)
            rep(k,0,m-1)
            {
                dp[i][i][k][0]=cost(A[i].num,k);
                if (A[i].num+k<m) dp[i][i][k][1]=0;
                    else dp[i][i][k][1]=cost(A[i].num,0);
            }
        for(int l=tot-1;l>=1;--l)
        {
            rep(r,l+1,tot)
            {
                rep(k,0,m-1)
                {
                    dp[l][r][k][0]=dp[l][r-1][0][0]+cost(A[r].num,k);

                    if (A[r].num+k<m) dp[l][r][k][1]=dp[l][r-1][0][0];
                        else dp[l][r][k][1]=dp[l][r-1][0][0]+cost(A[r].num,0);
                    if (k+A[r].num<m)
                    {
                        rep(x,l,r-1) if(A[x].col==A[r].col)
                            dp[l][r][k][0]=min(dp[l][r][k][0],dp[l][x][k+A[r].num][0]+dp[x+1][r-1][0][0]);
                    }   else
                    {
                        rep(x,l,r-1) if(A[x].col==A[r].col)
                        {
                            dp[l][r][k][0]=min(dp[l][r][k][0],dp[l][x][A[r].num][1]+dp[x+1][r-1][0][0]);
                        }
                    }
                    if (k+A[r].num<m-1)
                    {
                        rep(x,l,r-1) if(A[x].col==A[r].col)
                            dp[l][r][k][1]=min(dp[l][r][k][1],dp[l][x][k+A[r].num][1]+dp[x+1][r-1][0][0]);
                    }   else
                    {
                        rep(x,l,r-1) if(A[x].col==A[r].col)
                            dp[l][r][k][1]=min(dp[l][r][k][1],dp[l][x][A[r].num][0]+dp[x+1][r-1][0][0]);
                    }
                    //cout<<l<<" "<<r<<" "<<k<<" "<<dp[l][r][k][0]<<" "<<dp[l][r][k][1]<<endl;
                }
            }
        }
        printf("Case #%d: %d\n",t,dp[1][tot][0][0]);
    }
    return 0;
}

H.Chinese Zodiac

  网络赛队友过

I.Smallest Minimum Cut 

  网络流原题,网络赛队友过

J.Brute Force Sorting

  链表套链表,比赛没实现好,赛后已补

#include<bits/stdc++.h>
#define rep(i,a,b) for (int i=a;i<=b;++i)
const int maxn=500010;
using namespace std;
int t,n;

struct lbb{
    int next,pre;
}lb[maxn+10];

struct node{
    int next,pre,head,tail;
    bool flag1,flag2;
}nd[maxn+10];
int a[maxn+10],tot,j,tl,nx,tp,tn,ans,tr,k,tk,tnx;
int main()
{
    scanf("%d",&t);
    while(t--)
    {
        memset(a,0,sizeof(a));
        memset(nd,0,sizeof(nd));
        memset(lb,0,sizeof(lb));
        scanf("%d",&n);
        rep(i,1,n) scanf("%d",a+i);a[n+1]=0;
        j=tl=1;tot=0;
        while(j<=n)
        {
            if (a[j]>a[j+1])
            {
                if (tl!=1) ++tl;
                if (j!=n) tr=j-1;else tr=j;
                if (tr>=tl)
                {
                    ++tot;
                    nd[tot].next=tot+1;nd[tot].pre=tot-1;nd[tot].head=tl;nd[tot].tail=tr;
                    lb[tl].pre=-1;if (tl!=tr) lb[tl].next=tl+1;
                    lb[tr].next=-1;if (tl!=tr) lb[tr].pre=tr-1;
                    rep(i,tl+1,tr-1) lb[i].pre=i-1,lb[i].next=i+1;
                }
                tl=j+1;
            }
            ++j;
        }
        //cout<<tot<<endl;
        if (tot==0) {printf("0\n\n");continue;}
        nd[0].next=1;nd[0].head=0;nd[0].tail=-1;nd[0].pre=-1;
        while(nd[0].next!=tot+1 && nd[nd[0].next].next!=tot+1)
        {
            k=nd[0].next;
            while(k!=tot+1) nd[k].flag1=nd[k].flag2=false,k=nd[k].next;
            k=nd[0].next;nx=nd[k].next;
            while(nx!=tot+1)
            {
                if (a[nd[k].tail]<=a[nd[nx].head])
                {
                    nd[nx].pre=nd[k].pre;
                    //cout<<nd[nx].pre<<endl;
                    nd[nd[k].pre].next=nx;
                    lb[nd[nx].head].pre=nd[k].tail;
                    lb[nd[k].tail].next=nd[nx].head;
                    nd[nx].head=nd[k].head;
                }
                k=nx;nx=nd[k].next;
            }
            k=nd[0].next;
            if (k==tot+1) break;
            nx=nd[k].next;
            while(nx!=tot+1)
            {
                if (a[nd[k].tail]>a[nd[nx].head]) nd[k].flag2=nd[nx].flag1=true;
                k=nx;nx=nd[k].next;
            }
            k=0;
            while(1)
            {
                k=nd[k].next;
                if (k==tot+1) break;
                if (nd[k].flag1)
                {
                    nd[k].head=lb[nd[k].head].next;
                    if (nd[k].head!=-1) lb[nd[k].head].pre=-1;
                        else {nd[nd[k].pre].next=nd[k].next;nd[nd[k].next].pre=nd[k].pre;continue;}
                }
                if (nd[k].flag2)
                {
                    nd[k].tail=lb[nd[k].tail].pre;
                    if  (nd[k].tail!=-1) lb[nd[k].tail].next=-1;
                        else {nd[nd[k].pre].next=nd[k].next;nd[nd[k].next].pre=nd[k].pre;continue;}
                }
                //lb[nd[tk].tail].next=nd[tnx].head;
                //lb[nd[tnx].head].pre=nd[tk].tail;
            }
        }
        ans=0;
        k=nd[0].next;
        if (k==tot+1) {printf("0\n\n");continue;}
        for(int i=nd[k].head;i!=-1;i=lb[i].next)
        {
            ++ans;
        }
        printf("%d\n",ans);
        k=nd[0].next;
        for(int i=nd[k].head;i!=-1;i=lb[i].next)
        {
            printf("%d ",a[i]);
        }
        printf("\n");
    }
    return 0;
}

K.A Cubic number and A Cubic Number

  网络赛队友过

 

posted on 2017-09-20 22:45  心里只有学习  阅读(640)  评论(0编辑  收藏  举报

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