Submission #635448

#	Time	Username	Problem	Language	Result	Execution time	Memory
635448		radal	Triple Jump (JOI19_jumps)	C++17	19 / 100	257 ms	77408 KiB

jumps

#include <bits/stdc++.h>
#pragma GCC target("sse,sse2")
#pragma GCC optimize("unroll-loops,O3")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pll;
constexpr int N = 5e3+20,mod = 1e9+7,inf = 1e9+10;
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
    if (a+b < 0) return a+b+mod;
    return a+b;
}
 
inline int poww(int a,int k){
    if (k < 0) return 0;
    int z = 1;
    while (k){
        if (k&1) z = 1ll*z*a%mod;
        a = 1ll*a*a%mod;
        k /= 2;
    } 
    return z; 
}
int n;
int a[N],dp[N][N],mx[N][20],lg[N];

int rmq(int l,int r){
    int j = lg[r-l];
    return max(mx[r-1][j],mx[l+(1 << j)-1][j]);
}

int main(){
    ios_base :: sync_with_stdio(0); cin.tie(0);
    cin >> n;
    lg[1] = 0;
    rep(i,2,n+1) lg[i] = 1+lg[i/2];
    rep(i,0,n){
        cin >> a[i];
        mx[i][0] = a[i];
    }
    rep(j,1,20){
        rep(i,(1 << j)-1,n){
            mx[i][j] = max(mx[i][j-1],mx[i-(1 << (j-1))][j-1]);
        }
    }
    repr(l,n-3,0){
        rep(r,l+3,n+1){
            if (r-l == 3){
                dp[l][r] = a[l]+a[l+1]+a[l+2];
                continue;
            }
            dp[l][r] = max({dp[l+1][r],dp[l][r-1],a[l]+a[r-1]+rmq(l+1,(l+r-1)/2+1)});
        }
    }
    int q;
    cin >> q;
    while (q--){
        int l,r;
        cin >> l >> r;
        l--;
        cout << dp[l][r] << endl;
    }
    return 0;
}

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