Submission #1100493

#TimeUsernameProblemLanguageResultExecution timeMemory
1100493Ryuga_Feast (NOI19_feast)C++17
30 / 100
204 ms11084 KiB
/*For today, you happen to be the defeated. But what will you become tomorrow?*/ #include<bits/stdc++.h> using namespace std; using ll = long long; const int N = 300005; const ll inf = (1ll << 60); int arr[N], n, k; array<ll, 2> dp[N][2]; array<ll, 2> f(ll c) { for(int i = 0; i <= n; i ++) { dp[i][0] = {0, 0}; dp[i][1] = {-inf, 0}; } for(int i = 1; i <= n; i ++) { dp[i][0] = dp[i - 1][0]; dp[i][1] = {dp[i - 1][1][0] + (ll)arr[i], dp[i - 1][1][1]}; array<ll, 2> cur = {dp[i - 1][0][0] + (ll)arr[i] - c, dp[i - 1][0][1] + 1}; dp[i][1] = max(dp[i][1], cur); dp[i][0] = max(dp[i][0], dp[i][1]); } return dp[n][0]; } void solve() { cin >> n >> k; for(int i = 1; i <= n; i ++) cin >> arr[i]; ll lo = -(1ll << 60), hi = (1ll << 60), ans = 0; while(lo <= hi) { ll mid = (lo + hi) / 2; array<ll, 2> yo = f(mid); if(yo[1] >= k) { ans = yo[0] + k * mid; lo = mid + 1; } else { hi = mid - 1; } } cout << ans << '\n'; } int32_t main() { ios::sync_with_stdio(0); cin.tie(0); int t = 1; // cin >> t; while(t--){ solve(); } return 0; }
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