제출 #1267379

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1267379		Faggi	송신탑 (IOI22_towers)	C++20	14 / 100	257 ms	2332 KiB

towers

#include <bits/stdc++.h>
#define ll long long
using namespace std;


ll n;
vector<int>h;
vector<ll>v;
void init(int N, std::vector<int> H) {
    h=H;
    v.resize(N,0);
    n=N;
    ll i;
    for(i=1; i<N; i++)
    {
        v[i]=v[i-1];
        if(i+1<N&&H[i]<H[i+1]&&H[i]<H[i-1])
            v[i]++;
    }
}
bool in=0;
void ini(ll D)
{
    in=1;
    ll i;
    for(i=1; i<n; i++)
    {
        v[i]=v[i-1];
        if(i+1<n&&h[i]<=h[i+1]-D&&h[i]<=h[i-1]-D)
            v[i]++;
    }
}
int max_towers(int L, int R, int D) {
    if(in==0)
        ini(D);
    if(L==R)
        return 1;
    int ans=v[R-1]-v[L];
    if(h[L]<=h[L+1]-D)
        ans++;
    if(h[R]<=h[R-1]-D)
        ans++;
    return ans;
}

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