Submission #773602

#	Time	Username	Problem	Language	Result	Execution time	Memory
773602		CyberCow	Triple Jump (JOI19_jumps)	C++17	19 / 100	2110 ms	103376 KiB

jumps

//#include <bits/stdc++.h>
#include <random>
#include <algorithm>
#include <bitset>
#include <chrono>
#include <cmath>
#include <deque>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <map>
#include <queue>
#include <set>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <chrono>
#define fr first
#define sc second
#define ad push_back
using namespace std;
using ll = long long;
mt19937 rnd(348502);
const int N = 5005;
int a[N];
int dp[N][N];
int s[4 * N];

void build(int p, int lp, int rp)
{
    if (lp == rp)
    {
        s[p] = a[lp];
        return;
    }
    int m = (lp + rp) / 2;
    build(p * 2, lp, m);
    build(p * 2 + 1, m + 1, rp);
    s[p] = max(s[p * 2], s[p * 2 + 1]);
}

int get(int p, int lp, int rp, int l, int r)
{
    if (l > r)
        return 0;
    if (lp == l && rp == r)
        return s[p];
    int m = (lp + rp) / 2;
    return max(get(p * 2, lp, m, l, min(r, m)), get(p * 2 + 1, m + 1, rp, max(m + 1, l), r));
}

void solve()
{
    int n, i, j, x, y, m;
    cin >> n;
    for ( i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    build(1, 1, n);
    for ( i = 1; i <= n; i++)
    {
        int ma = 0;
        for (j = i + 2; j <= n; j++)
        {
            dp[i][j] = max(dp[i][j], get(1, 1, n, i + 1, (i + j) / 2) + a[i] + a[j]);
        }
    }
    for ( i = 2; i <= n; i++)
    {
        for ( j = 1; j <= n; j++)
        {
            dp[j][j + i - 1] = max(dp[j][j + i - 1], max(dp[j + 1][j + i - 1], dp[j][j + i - 2]));
        }
    }
    int q;
    cin >> q;
    for ( i = 0; i < q; i++)
    {
        cin >> x >> y;
        cout << dp[x][y] << '\n';
    }
}


int main() {    
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    ll tt = 1;
    //cin >> tt;
    while (tt--) {
        solve();
    }
    return 0;
}

Compilation message (stderr)

jumps.cpp: In function 'void solve()':
jumps.cpp:67:13: warning: unused variable 'ma' [-Wunused-variable]
   67 |         int ma = 0;
      |             ^~
jumps.cpp:58:24: warning: unused variable 'm' [-Wunused-variable]
   58 |     int n, i, j, x, y, m;
      |                        ^

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 0 / 27
• Subtask 4: 0 / 54