제출 #786976

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
786976		andrei_boaca	송신탑 (IOI22_towers)	C++17	0 / 100	4094 ms	15584 KiB

towers

#include "towers.h"
#include <bits/stdc++.h>
//#include "stub.cpp"
using namespace std;
typedef pair<int,int> pii;
int n;
int v[100005];
int rmq[22][100005];
int loga[100005];
void init(int N, std::vector<int> H) {
    n=N;
    for(int i=1;i<=n;i++)
    {
        v[i]=H[i-1];
        for(int j=0;j<=20;j++)
            if((1<<j)<=i)
                loga[i]=j;
    }
    for(int i=n;i>=1;i--)
    {
        rmq[0][i]=v[i];
        for(int j=1;j<=20;j++)
        {
            rmq[j][i]=rmq[j-1][i];
            int poz=i+(1<<(j-1));
            if(poz<=n)
                rmq[j][i]=max(rmq[j][i],rmq[j-1][poz]);
        }
    }
}
int dp[100005];
int arb[4*100005];
vector<int> add[100005];
int getmax(int l,int r)
{
    int lg=loga[r-l+1];
    return max(rmq[lg][l],rmq[lg][r-(1<<lg)+1]);
}
int getR(int poz,int delta)
{
    int st=poz+2;
    int dr=n;
    int ans=1e9;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(getmax(poz+1,mij-1)-delta>=v[poz])
        {
            ans=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    return ans;
}
int getL(int poz,int delta)
{
    bool ok=0;
    if(poz==4)
        ok=1;
    int st=1;
    int dr=poz-2;
    int ans=0;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(getmax(mij+1,poz-1)-delta>=v[poz])
        {
            ans=mij;
            st=mij+1;
        }
        else
            dr=mij-1;
    }
    return ans;
}
void update(int nod,int st,int dr,int poz,int val)
{
    if(st==dr)
    {
        arb[nod]=val;
        return;
    }
    int mij=(st+dr)/2;
    if(poz<=mij)
        update(nod*2,st,mij,poz,val);
    else
        update(nod*2+1,mij+1,dr,poz,val);
    arb[nod]=max(arb[nod*2],arb[nod*2+1]);
}
int query(int nod,int st,int dr,int a,int b)
{
    if(st>=a&&dr<=b)
        return arb[nod];
    int mij=(st+dr)/2;
    int rez=0;
    if(a<=mij)
        rez=max(rez,query(nod*2,st,mij,a,b));
    if(b>mij)
        rez=max(rez,query(nod*2+1,mij+1,dr,a,b));
    return rez;
}
int max_towers(int L, int R, int D)
{
    L++;
    R++;
    for(int i=1;i<=4*n;i++)
        arb[i]=0;
    for(int i=1;i<=n;i++)
        add[i].clear();
    int ans=1;
    for(int i=L;i<=R;i++)
    {
        for(int j:add[i])
            update(1,1,n,j,dp[j]);
        dp[i]=1;
        int r=getR(i,D);
        int l=getL(i,D);
        if(l>=L)
            dp[i]=1+query(1,1,n,L,l);
        ans=max(ans,dp[i]);
        if(r<=R)
            add[r].push_back(i);
    }
    for(int i=R;i>=L;i--)
        if(v[i]<=v[i+1]||i==L)
            return dp[i];
}

컴파일 시 표준 에러 (stderr) 메시지

towers.cpp: In function 'int getL(int, int)':
towers.cpp:59:10: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
   59 |     bool ok=0;
      |          ^~
towers.cpp: In function 'int max_towers(int, int, int)':
towers.cpp:129:1: warning: control reaches end of non-void function [-Wreturn-type]
  129 | }
      | ^

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