Submission #537564

#	Time	Username	Problem	Language	Result	Execution time	Memory
537564		zaneyu	Planine (COCI21_planine)	C++14	0 / 110	2089 ms	1332 KiB

Main

/*input
9 5
-5 2
-4 3
-2 1
0 4
2 2
3 3
4 1
5 2
6 1
*/
#include<bits/stdc++.h>
using namespace std;
#define REP(i,n) for(int i=0;i<n;i++)
#define MNTO(x,y) x=min(x,y)
#define MXTO(x,y) x=max(x,y)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define ll long long
#define ld long double
#define sz(x) (int)x.size()
#define pii pair<int,int>
#define pdd pair<ld,ld>
#define f first
#define s second
#define pb push_back
#define ALL(x) x.begin(),x.end()
const int INF=0x3f3f3f3f;
const int maxn=1e6+5;
pii arr[maxn];
int h;
ld get(int a,int i){
    ld m=1.0*(arr[a].s-arr[i].s)/(arr[a].f-arr[i].f);
    ld c=arr[i].s-m*arr[i].f;
    return (h-c)/m;
}
int main(){
    ios::sync_with_stdio(false),cin.tie(0);
    int n;
    cin>>n>>h;
    REP(i,n) cin>>arr[i].f>>arr[i].s;
    vector<pdd> v;
    REP1(i,n-2){
        if(i%2) continue;
        ld l=-INF,r=INF;
        REP(j,i){
            if(j%2==0) continue;
            MXTO(l,get(j,i));
        }
        for(int j=i+1;j<n;j+=2){
            MNTO(r,get(j,i));
        }
        v.pb({l,r});
    }
    sort(ALL(v));
    ld cur=-INF;
    int ans=0;
    for(auto x:v){
        //cout<<x.f<<' '<<x.s<<'\n';
        if(x.f>cur) ++ans,cur=x.s;
        else MNTO(cur,x.s);
    }
    cout<<ans<<'\n';
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 60