oj.uz

답안 #44822

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
44822 2018-04-07T09:19:48 Z leehosu01 먼 별 (KOI16_dist) C++17
2 / 100
 117 ms 2044 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
#define F(X) (X<0?-1:X>0)
ll T,MT,N,tms,bst=1ll<<62ll;
struct A{
int x,y,dx,dy;void SC(){cin>>x>>y>>dx>>dy;}
ll lcx(){return T*dx+x;}
ll lcy(){return T*dy+y;}
bool operator<(const A&X)const{return T*dx+x==T*X.dx+X.x?T*dy+y>T*X.dy+X.y:T*dx+x<T*X.dx+X.x;}
bool operator==(const A&X)const{return T*dx+x==T*X.dx+X.x&&T*dy+y==T*X.dy+X.y;}
ll Ds(A&X){return (lcx()-X.lcx())*(lcx()-X.lcx())+(lcy()-X.lcy())*(lcy()-X.lcy());}
}S[30001];
int cp(ll*X,ll*Y)
{
    ll T=0;
    for(int i=0;i<3;i++)
        T+=X[i]*Y[i+1]-X[i+1]*Y[i];
    return F(T);
}
int ccw(A&x0,A&x1,A&x2)
{
    A XA[4]={x0,x1,x2,x0};
    ll XX[4],YY[4];
    for(int i=0;i<4;i++)
    {
        XX[i]=XA[i].lcx();
        YY[i]=XA[i].lcy();
    }
    return cp(XX,YY);
}
inline ld slop(A&d1,A&d2)
{
    return ((ld)d1.lcy()-d2.lcy())/((ld)d1.lcx()-d2.lcx());
}
bool used[30001];
ll pro(int Ts)
{

    list<int>::iterator s1,s2;
    list<int>cov;
    T=Ts;
    sort(S,S+N);
    int K=1;
    memset(used,0,sizeof(used));
    for(int i=0;i>=0;i+=K)
    {
        if(i==N){K=-1,s1=cov.begin(),s2=--cov.end();continue;}
        if(i!=0&&used[i])continue;
        while(cov.size()>=2&&ccw(S[*(--(--cov.end()))],S[cov.back()],S[i])==-1){used[cov.back()]=0;cov.pop_back();}
        used[i]=1;cov.push_back(i);
    }//시작정점은 2번들어간다.

    ll MX=0;
    list<int>::iterator I=s1,It,J=s2,Jt;
    bool mdgd=0;
    do{
        if(mdgd)
        {
            if(slop(S[*I],S[*It])<slop(S[*J],S[*Jt]))++I;
            else ++J;
        }
        It=I;++It;
        Jt=J;++Jt;
        if(It==cov.end())break;
        if(Jt==cov.end())break;
        MX=max(MX,S[*I].Ds(S[*J]));
        MX=max(MX,S[*It].Ds(S[*J]));
        if(Jt!=cov.end())
        {
            MX=max(MX,S[*I].Ds(S[*Jt]));
            MX=max(MX,S[*It].Ds(S[*Jt]));
        }
        mdgd=1;
    }while(It!=s2&&Jt!=cov.end());
    
    while(I!=s2&&It!=s2){
        It=I;++It;
        if(It==cov.end())break;
        MX=max(MX,S[*I].Ds(S[*J]));
        MX=max(MX,S[*I].Ds(S[*Jt]));
        if(It!=s2)
        {
            MX=max(MX,S[*It].Ds(S[*J]));
            MX=max(MX,S[*It].Ds(S[*Jt]));
        }
        ++I;
    }
    while(J!=cov.end()&&Jt!=cov.end()){
        Jt=J;++Jt;
        if(Jt==cov.end())break;
        MX=max(MX,S[*I].Ds(S[*J]));
        MX=max(MX,S[*It].Ds(S[*J]));
        if(Jt!=cov.end())
        {
            MX=max(MX,S[*I].Ds(S[*Jt]));
            MX=max(MX,S[*It].Ds(S[*Jt]));
        }
        else break;
        ++J;
    }
    if(MX<bst)bst=MX,tms=Ts;
    else if(MX==bst&&tms>Ts)tms=Ts;
    return MX;
}

int main()
{
    int i;

   //freopen("in.txt","r",stdin);
    cin>>N>>MT;
    for(i=0;i<N;i++)S[i].SC();
    ll l=0,r=MT,m,PS[3],minl,minI;
    while(l<r)
    {
        m=l+r>>1;
        minl=1ll<<62ll;
        minI=-1;
        for(i=-1;i<2;i++)
        {
            if(m+i>=0&&m+i<=MT)
            {
                PS[i+1]=pro(m+i);
                if(PS[i+1]<minl)
                {
                    minl=PS[i+1];
                    minI=i;
                }
            }
        }
        if(minI==-1)r=m-1;
        else if(minI==0)r=m;
        else l=m+1;
    }
    cout<<tms<<'\n'<<bst;

}

Compilation message

dist.cpp: In function 'int main()':
dist.cpp:119:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         m=l+r>>1;
           ~^~

Subtask #1
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 488 KB Output is correct
3 Correct 2 ms 488 KB Output is correct
4 Correct 2 ms 488 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 2 ms 604 KB Output is correct
10 Correct 2 ms 604 KB Output is correct

Subtask #2
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 488 KB Output is correct
3 Correct 2 ms 488 KB Output is correct
4 Correct 2 ms 488 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 2 ms 604 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 16 ms 620 KB Output is correct
12 Correct 17 ms 620 KB Output is correct
13 Correct 16 ms 620 KB Output is correct
14 Correct 17 ms 704 KB Output is correct
15 Correct 10 ms 704 KB Output is correct
16 Correct 13 ms 748 KB Output is correct
17 Correct 15 ms 748 KB Output is correct
18 Correct 10 ms 748 KB Output is correct
19 Correct 13 ms 748 KB Output is correct
20 Incorrect 18 ms 748 KB Output isn't correct

Subtask #3
0 / 39.0

# 결과 실행 시간 메모리 Grader output
1 Correct 117 ms 1020 KB Output is correct
2 Correct 114 ms 1020 KB Output is correct
3 Correct 114 ms 1036 KB Output is correct
4 Correct 86 ms 2036 KB Output is correct
5 Correct 84 ms 2044 KB Output is correct
6 Correct 115 ms 2044 KB Output is correct
7 Incorrect 104 ms 2044 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 488 KB Output is correct
3 Correct 2 ms 488 KB Output is correct
4 Correct 2 ms 488 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 2 ms 604 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 16 ms 620 KB Output is correct
12 Correct 17 ms 620 KB Output is correct
13 Correct 16 ms 620 KB Output is correct
14 Correct 17 ms 704 KB Output is correct
15 Correct 10 ms 704 KB Output is correct
16 Correct 13 ms 748 KB Output is correct
17 Correct 15 ms 748 KB Output is correct
18 Correct 10 ms 748 KB Output is correct
19 Correct 13 ms 748 KB Output is correct
20 Incorrect 18 ms 748 KB Output isn't correct