This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/**
* author: Haunted_Cpp
**/
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC target("fma,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("unroll-loops")
template<typename T> ostream &operator << (ostream &os, const vector<T> &v) { os << '{'; string sep; for (const auto &x : v) os << sep << x, sep = ", "; return os << '}'; }
template<typename T, size_t size> ostream &operator << (ostream &os, const array<T, size> &arr) { os << '{'; string sep; for (const auto &x : arr) os << sep << x, sep = ", "; return os << '}'; }
template<typename A, typename B> ostream &operator << (ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; }
void debug_out() { cerr << endl; }
template<typename Head, typename... Tail> void debug_out(Head H, Tail... T) { cerr << ' ' << H; debug_out(T...); }
#ifdef LOCAL
#define debug(...) cerr << "(" << #__VA_ARGS__ << "):", debug_out(__VA_ARGS__)
#else
#define debug(...) 47
#endif
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
vector<long long> arr(n + 1);
for (int i = 1; i <= n; i++) cin >> arr[i];
vector<long long> dp(n + 1, 1e18);
dp[0] = 0;
for (int i = 1; i <= n; i++) {
long long mx = 0;
for (int j = i - 1; j >= 0; j--) {
mx = max(mx, arr[j + 1]);
dp[i] = min(dp[i], dp[j] + 1LL * mx * (n - j));
}
}
cout << dp[n] << '\n';
return 0;
}
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