oj.uz

답안 #113218

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
113218 2019-05-24T10:51:56 Z knon0501 먼 별 (KOI16_dist) C++14
100 / 100
 475 ms 3044 KB 
#include <bits/stdc++.h>
using namespace std;
int n,t;
#define mp make_pair
#define x first
#define y second
typedef long long ll;
typedef pair<ll,ll> pp;
pp a[300005];
pp v[300005];
pp s[300005];
pp b[300005];
pair<ll,int> ans={8e18+2e17,1e9};

long double f(pp q,pp w,pp e){
    ll aa=q.y-w.y;
    ll bb=w.x-q.x;
    ll cc=q.x*w.y-q.y*w.x;
    return (long double)(aa*e.x+bb*e.y+cc)/sqrt((long double)(aa*aa+bb*bb));
}
ll ccw(pp q,pp w,pp e){
    return (w.x-q.x)*(e.y-w.y)-(w.y-q.y)*(e.x-w.x);
}
ll dist(pp q,pp w){
    return (w.x-q.x)*(w.x-q.x)+(w.y-q.y)*(w.y-q.y);
}
bool comp(pp q,pp w){
    ll k=ccw(b[1],q,w);
    return k ? k>0 : dist(b[1],q)<dist(b[1],w);
}
ll process(ll ti){
    if(ti<0 || ti>t)return 1e18;
    int i,j;
    ll ret=0;
    for(i=1 ; i<=n ; i++)b[i]={a[i].x+ti*v[i].x,a[i].y+ti*v[i].y};
    sort(b+1,b+n+1);
    sort(b+2,b+n+1,comp);
    ret=dist(b[1],b[n]);
    int to=2;
    s[1]=b[1];
    s[2]=b[2];
    b[n+1]=b[1];
    for(i=3 ; i<=n+1 ; i++){
        while(to>=2 && ccw(s[to-1],s[to],b[i])<=0)to--;
        s[++to]=b[i];
    }
    to--;
    if(to<3)return ret;
   /// cout<<to<<" "<<ti<<endl;
    j=2;
    for(i=1 ; i<=to ; i++){
        int ii=i%to+1;
        if(j>to)j=1;
        while(f(s[i],s[ii],s[j%to+1])>f(s[i],s[ii],s[j]) ){
            ret=max({ret,dist(s[i],s[j]),dist(s[ii],s[j])});
            j++;
            if(j>to)j=1;
        }
        ret=max({ret,dist(s[i],s[j]),dist(s[ii],s[j])});
    }
   /// cout<<ret<<endl;
    return ret;
}
int main(){
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);

    cin>>n>>t;

    int i;
    for(i=1 ; i<=n ; i++)cin>>a[i].x>>a[i].y>>v[i].x>>v[i].y;

    int lef=0;
    int rig=t;

    while(rig>=lef){
        int mid=(lef+rig)/2;
        ll q=process(mid-1);
        ll w=process(mid);
        ll e=process(mid+1);
        if(mp(q,mid-1)<ans){
            ans={q,mid-1};
        }
        if(mp(w,mid)<ans){
            ans={w,mid};
        }
        if(mp(e,mid+1)<ans){
            ans={e,mid+1};
        }
        if(q>w && w>e)lef=mid+1;
        else rig=mid-1;
    }
    cout<<ans.second<<endl<<ans.first;

    return 0;
}

Subtask #1
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct

Subtask #2
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 11 ms 384 KB Output is correct
12 Correct 12 ms 512 KB Output is correct
13 Correct 11 ms 512 KB Output is correct
14 Correct 12 ms 512 KB Output is correct
15 Correct 11 ms 384 KB Output is correct
16 Correct 17 ms 512 KB Output is correct
17 Correct 10 ms 512 KB Output is correct
18 Correct 8 ms 512 KB Output is correct
19 Correct 10 ms 384 KB Output is correct
20 Correct 14 ms 512 KB Output is correct

Subtask #3
39.0 / 39.0

# 결과 실행 시간 메모리 Grader output
1 Correct 105 ms 1912 KB Output is correct
2 Correct 94 ms 1836 KB Output is correct
3 Correct 105 ms 1792 KB Output is correct
4 Correct 91 ms 2272 KB Output is correct
5 Correct 74 ms 1792 KB Output is correct
6 Correct 84 ms 2296 KB Output is correct
7 Correct 76 ms 2040 KB Output is correct
8 Correct 47 ms 1792 KB Output is correct
9 Correct 103 ms 2168 KB Output is correct
10 Correct 100 ms 1792 KB Output is correct

Subtask #4
19.0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 11 ms 384 KB Output is correct
12 Correct 12 ms 512 KB Output is correct
13 Correct 11 ms 512 KB Output is correct
14 Correct 12 ms 512 KB Output is correct
15 Correct 11 ms 384 KB Output is correct
16 Correct 17 ms 512 KB Output is correct
17 Correct 10 ms 512 KB Output is correct
18 Correct 8 ms 512 KB Output is correct
19 Correct 10 ms 384 KB Output is correct
20 Correct 14 ms 512 KB Output is correct
21 Correct 105 ms 1912 KB Output is correct
22 Correct 94 ms 1836 KB Output is correct
23 Correct 105 ms 1792 KB Output is correct
24 Correct 91 ms 2272 KB Output is correct
25 Correct 74 ms 1792 KB Output is correct
26 Correct 84 ms 2296 KB Output is correct
27 Correct 76 ms 2040 KB Output is correct
28 Correct 47 ms 1792 KB Output is correct
29 Correct 103 ms 2168 KB Output is correct
30 Correct 100 ms 1792 KB Output is correct
31 Correct 435 ms 2532 KB Output is correct
32 Correct 428 ms 2304 KB Output is correct
33 Correct 408 ms 2424 KB Output is correct
34 Correct 423 ms 2432 KB Output is correct
35 Correct 306 ms 2432 KB Output is correct
36 Correct 462 ms 3044 KB Output is correct
37 Correct 282 ms 2680 KB Output is correct
38 Correct 174 ms 2560 KB Output is correct
39 Correct 304 ms 2564 KB Output is correct
40 Correct 430 ms 2556 KB Output is correct
41 Correct 475 ms 2960 KB Output is correct
42 Correct 416 ms 3020 KB Output is correct