Submission #399321

#	Time	Username	Problem	Language	Result	Execution time	Memory
399321		rocks03	Peru (RMI20_peru)	C++14	0 / 100	1 ms	388 KiB

peru

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define ff first
#define ss second
#define pb push_back
#define SZ(x) ((int)(x).size())
#define all(x) x.begin(), x.end()
#define debug(x) cout << #x << ": " << x << " "
#define nl cout << "\n"
#define rep(i, a, b) for(int i = (a); i < (b); i++)
#define per(i, a, b) for(int i = (a); i >= (b); i--)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int M = 1e9 + 7;

int solve(int N, int K, int* a){
    vector<ll> dp(N + 1, LLONG_MAX);
    dp[0] = 0;
    deque<int> q;
    rep(i, 1, N + 1){
        while(SZ(q) && q[0] < i - K){
            q.pop_front();
        }
        while(SZ(q) && a[q.back() - 1] <= a[i - 1]){
            q.pop_back();
        }
        q.pb(i);
        if(i > K){
            dp[i] = dp[i - K] + a[q[0] - 1];

        } else{
            dp[i] = a[q[0] - 1];
        }
    }
    vector<ll> pt(N + 1);
    pt[N] = 1;
    per(i, N - 1, 1){
        pt[i] = (pt[i + 1] * 23ll) % M;
    }
    ll ans = 0;
    rep(i, 1, N + 1){
        ans += (dp[i] * pt[i]) % M;
        ans %= M;
    }
    return ans;
}

• Subtask 1: 0 / 18
• Subtask 2: 0 / 31
• Subtask 3: 0 / 51