Submission #1234280

#	Time	Username	Problem	Language	Result	Execution time	Memory
1234280		yixuan19	Global Warming (CEOI18_glo)	C++20	15 / 100	13 ms	2748 KiB

glo

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

const long long decalage = (1<<25);
int tab[2*decalage];
void modify(int ind, int new_val){
    tab[ind] = new_val;
    while (ind > 1){
        ind/=2;
        tab[ind] = max(tab[ind*2], tab[ind*2+1]);
    }
}

int query(int l, int r){
    if (l == r) return tab[l];
    if (l%2 == 1){
        return max(tab[l], query(l+1,r));
    }
    if (r%2 == 0){
        return max(tab[r], query(l,r-1));
    }
    return query(l/2,r/2);
}

int tab2[2*decalage];
void modify2(int ind, int new_val){
    tab2[ind] = new_val;
    while (ind > 1){
        ind/=2;
        tab2[ind] = max(tab2[ind*2], tab2[ind*2+1]);
    }
}

int query2(int l, int r){
    if (l == r) return tab2[l];
    if (l%2 == 1){
        return max(tab2[l], query2(l+1,r));
    }
    if (r%2 == 0){
        return max(tab2[r], query2(l,r-1));
    }
    return query2(l/2,r/2);
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int N, max_change, temp;
    cin >> N >> max_change;
    vector<int> temps;
    for (int i = 0; i < N; ++i){
        cin >> temp;
        temps.push_back(temp);
    }
    int dp[N+1][2];
    for (int i = 0; i < N; ++i){
        for (int j = 0; j < 2; ++j){
            dp[i][j] = 0;
        }
    }
    
    dp[0][0] = 1;
    dp[0][1] = 1;
    modify(temps[0]+decalage, 1);
    modify2(temps[0]+decalage, 1);
    
    for (int i = 1; i < N; ++i){
        dp[i][0] = query(decalage,temps[i] + decalage -1) + 1;
        dp[i][1] = query(decalage,temps[i] + decalage -1 + max_change) + 1;

        //cout<<"query 0 "<<i<<" "<<query(decalage,temps[i] + decalage -1)<<endl;
        //cout<<"query 1 "<<i<<" "<<query(decalage,temps[i] + decalage -1 + max_change)<<endl;
        //cout<<"query 2 "<<i<<" "<<query2(decalage,temps[i] + decalage -1)<<endl;
        //cout<<max(dp[i][1],query2(decalage,temps[i] + decalage -1))<<endl;
        
        dp[i][1] = max(dp[i][1],query2(decalage,temps[i] + decalage -1)+1);

        modify(temps[i]+decalage, dp[i][0]);
        modify2(temps[i]+decalage, dp[i][1]);
    }

    int maxi = 0;
    for (int i = 0; i < N; ++i ){
        for (int j = 0; j < 2; ++j){
            //cout<<dp[i][j]<<" ";
            maxi = max(maxi, dp[i][j]);
        }
        //cout<<endl;
    }
    cout<<maxi<<endl;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25