//#include "peru.h"
#include <bits/stdc++.h>
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>
using namespace std;
//using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
typedef unsigned int ui;
#define ii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vii vector<ii>
#define vll vector<ll>
#define vpll vector<pll>
#define matrix vector<vi>
#define matrixLL vector<vll>
#define vs vector<string>
#define vui vector<ui>
#define msi multiset<int>
#define mss multiset<string>
#define si set<int>
#define ss set<string>
#define PB push_back
#define PF push_front
#define PPB pop_back
#define PPF pop_front
#define X first
#define Y second
#define MP make_pair
#define FOR(i, a, b) for (int i = int(a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define all(x) (x).begin(), (x).end()
const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int dxx[] = {-1, 1, 0, 0, 1, 1, -1, -1};
const int dyy[] = {0, 0, -1, 1, -1, 1, -1, 1};
const string abc="abcdefghijklmnopqrstuvwxyz";
const string ABC="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const ld pi = 3.14159265;
const int mod = 1e9 + 7;
const int MOD = 1e9 + 7;
const int MAXN = 25 * 1e6 + 7;
const int inf = mod;
const ll INF = 1e18;
const ll zero = ll(0);
const int logo = 20;
const int off = 1 << logo;
const int trsz = off << 1;
int add(ll a, ll b){
return (a + b) % mod;
}
int mul(ll a, ll b){
return (a * b) % mod;
}
ll dp[MAXN];
int solve(int n, int k, vi arr){
deque<int> dq;
multiset<ll> m;
si s;
int ret = 0;
REP(i, n){
while(!dq.empty() and dq.front() <= i - k){
int j = dq.front();
dq.PPF();
if(!dq.empty()) m.erase(m.find(dp[j] + arr[dq.front()]));
}
while(!dq.empty() and arr[dq.back()] <= arr[i]){
int j = dq.back();
dq.PPB();
if(!dq.empty()) m.erase(m.find(dp[dq.back()] + arr[j]));
}
dp[i] = INF;
if(!dq.empty()) m.insert(dp[dq.back()] + arr[i]);
dq.PB(i);
if(!m.empty()) dp[i] = *m.begin();
if(i < k) dp[i] = min(dp[i], (ll)arr[dq.front()]);
else dp[i] = min(dp[i], arr[dq.front()] + dp[i - k]);
ret = add(mul(23, ret), dp[i]);
}
return ret;
}
void solv(){
int n, k;
cin >> n >> k;
vi arr; arr.clear();
REP(i, n){
int x;
cin >> x;
arr.PB(x);
}
cout << solve(n, k, arr);
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int t=1;
//cin >> t;
while(t--)solv();
return 0;
}
Compilation message
/usr/bin/ld: /tmp/ccraOnmY.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccJV5ia1.o:peru.cpp:(.text.startup+0xb0): first defined here
/usr/bin/ld: /tmp/ccraOnmY.o: in function `main':
grader.cpp:(.text.startup+0x144): undefined reference to `solve(int, int, int*)'
collect2: error: ld returned 1 exit status
