제출 #503914

#제출 시각아이디문제언어결과실행 시간메모리
503914sumit_kk10수열 (APIO14_sequence)C++17
21 / 100
94 ms131076 KiB
#include <bits/stdc++.h> #define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL) #define S second #define F first #define pb push_back using namespace std; const int N = 2e5 + 5; const int MOD = 1e9 + 7; long long n, k, a[N], pre[N], par[100001][201]; vector<long long> dp(N), cur_dp(N); long long C(int i, int j){ return (pre[i] - pre[j]) * pre[j]; } void compute(int l, int r, int tl, int tr, int kk){ if(l > r) return; int mid = (l + r) / 2; pair<long long, int> p = {INT_MIN, -1}; for(int i = tl; i < min(mid, tr + 1); ++i){ if((dp[i] + C(mid, i)) > p.F){ p.F = dp[i] + C(mid, i); p.S = i; } } par[mid][kk] = p.S; cur_dp[mid] = p.F; compute(l, mid - 1, tl, p.S, kk); compute(mid + 1, r, p.S, tr, kk); } void solve(){ cin >> n >> k; for(int i = n - 1; i >= 0; --i) cin >> a[i]; for (int i = 0; i <= k; ++i) { for (int j = 0; j <= n; ++j) { par[i][j] = -1; } } pre[0] = a[0]; for(int i = 1; i < n; ++i) pre[i] = pre[i - 1] + a[i]; for(int i = 1; i <= k; ++i){ compute(0, n - 1, 0, n - 1, i); dp = cur_dp; } long long ans = 0, pos = 0; for(int i = 0; i < n; ++i){ if(dp[i] > ans){ ans = dp[i]; pos = i; } } cout << ans << '\n'; int ct = k; vector<int> res; while(ct > 0){ assert(n - par[pos][ct] - 1 >= 1 && n - par[pos][ct] - 1 <= n); cout << n - par[pos][ct] - 1 << ' '; pos = par[pos][ct]; --ct; } } int main(){ fast; int t = 1; // cin >> t; while(t--) solve(); return 0; }
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