Submission #440783

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
440783	2021-07-03 02:04:59	dongliu0426	Feast (NOI19_feast)	C++14	63 / 100	1028 ms	23260 KiB

feast

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#include <bits/stdc++.h>
using namespace std;
const int N = 300000;
const long long INF = (long long) 300000 * 1000000000;
const long double EPS = 1e-6;
int n, k, a[N + 1];
pair<long double, int> dp[N + 1][2];
  
bool check(long double penalty) {
  dp[0][0] = {0, 0}, dp[0][1] = {-INF, 0};
  for (int i = 1; i <= n; ++i) {
    dp[i][0] = max(dp[i - 1][0], dp[i - 1][1]);
    dp[i][1] = max(
      make_pair(dp[i - 1][1].first + a[i], dp[i - 1][1].second),
      make_pair(dp[i - 1][0].first + a[i] - penalty, dp[i - 1][0].second + 1)
    );
  }
  return max(dp[n][0], dp[n][1]).second >= k;
};
int main() {
  scanf("%d%d", &n, &k);
  for (int i = 1; i <= n; ++i)
    scanf("%d", a + i);
  long double lower = 0, upper = INF;
  while (lower + EPS < upper) {
    long double mid = (lower + upper) / 2;
    if (check(mid)) {
 
 
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Compilation message (stderr)

feast.cpp: In function 'int main()':
feast.cpp:24:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~
feast.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   scanf("%d", a + i);
      |   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 0 / 8
• Subtask 3: 18 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 0 / 29