Submission #1062832

#	Time	Username	Problem	Language	Result	Execution time	Memory
1062832		TimDee	Peru (RMI20_peru)	C++17	0 / 100	1 ms	344 KiB

peru

#include "peru.h"
#include <bits/stdc++.h>
using namespace std;
 
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("popcnt,avx2")

using ll = long long;
const int N=25e5+5;
ll dp[N];

int solve(int n, int k, int* v){
    const int mod = 1e9+7;
    #define int long long
    #define forn(i,n) for(int i=0; i<(n); ++i)
    #define pb push_back
    #define pi pair<int,int>
    #define f first
    #define s second 

    deque<pi> s;
    deque<pi> z;
    ll ans=0;
    int ptr=0;
    int R=0;
    forn(i,n) {
        while (s.size() && s[0].s<=i-k) {
            s.pop_front();
            --ptr;
        }
        while (z.size() && z[0].s<=i-k) z.pop_front();
        while (s.size() && s.back().f < v[i]) {
            s.pop_back();
            ptr=min(ptr,(int)s.size());
        }

        if (s.size()) {
            s.pb({v[i],i});
            int t = s.size()-2;
            while (z.size() && z.back().s > s[t].s) z.pop_back();
            while (t>0 && (dp[s[t].s]+s[t+1].f >= dp[s[t-1].s]+s[t].f)) {
                --t;
            }
            if (s[t].s<i-1) {
                while (z.size() && s[t].s+1 < z.back().s) z.pop_back();
                while (z.size() && z.back().f > dp[s[t].s]+s[t+1].f) z.pop_back();
                z.push_back({dp[s[t].s]+s[t+1].f,s[t].s+1});
            }
        } else {
            while (z.size()) z.pop_back();
            if (k>1 && i-k>=0) z.push_back({dp[i-k]+v[i],i-k+1});
            s.pb({v[i],i});
        }

        if (i-k>=0) {
            R=max(R,i-k);
            ptr=max(ptr,0ll);
            //cout<<"> "<<R<<' '<<ptr<<'\n';
            while (dp[R]==dp[R+1]) ++R;
            while (s[ptr].s<=R) ++ptr;
            //cout<<"???? "<<R<<' '<<ptr<<' '<<s[ptr].f<<' '<<s[ptr].s<<"  "<<z.front().f<<'\n';
            if (z.size()) if (dp[R]+s[ptr].f < z.front().f) {
                while (z.size() && (R+1>=z.front().s)) z.pop_front();
                z.push_front({dp[R]+s[ptr].f,R+1});
            }
        }
        //for(auto&x:z) cout<<x.f<<','<<x.s<<"  "; cout<<'\n';


        dp[i]=s[0].f;
        if (i-k>=0) dp[i]+=dp[i-k];
        if (i) dp[i]=min(dp[i],dp[i-1]+v[i]);
        if (z.size()) dp[i] = min(dp[i],z[0].f);
        if (i) {
            while (z.size() && z.back().f > dp[i-1]+v[i]) z.pop_back();
            z.pb({dp[i-1]+v[i],i});
        } else {
            while (z.size() && z.back().f > v[i]) z.pop_back();
            z.pb({v[i],i});
        }
        ans=(ans*23)%mod;
        ans=(ans+dp[i])%mod;
        //cout<<i<<": "<<dp[i]<<'\n';
        //for(auto&x:s) cout<<x.f<<','<<x.s<<"  "; cout<<'\n';
        //for(auto&x:z) cout<<x.f<<','<<x.s<<"  "; cout<<'\n';
        //cout<<'\n';
    }
    return ans;
    #undef int
}

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