Submission #256888

#	Time	Username	Problem	Language	Result	Execution time	Memory
256888		Bruteforceman	Discharging (NOI20_discharging)	C++11	36 / 100	1088 ms	14328 KiB

Discharging

#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e6 + 10;
const long long inf = 1e16;
long long dp[maxn];
int a[maxn];

struct hull {
  vector <long long> M, C;
  bool bad(int i, int j, int k) {
    return (C[k] - C[j]) * (M[i] - M[k]) <= (C[k] - C[i]) * (M[j] - M[k]);
  }
  void add(long long m, long long c) {
    M.push_back(m);
    C.push_back(c);
    while(M.size() >= 3 && bad(M.size() - 3, M.size() - 2, M.size() - 1)) {
      M.erase(M.end() - 2);
      C.erase(C.end() - 2);
    }
  }
};

int main() {
  int n;
  scanf("%d", &n);
  for(int i = 1; i <= n; i++) scanf("%d", &a[i]);
  for(int i = 1; i <= n; i++) {
    int m = a[i];
    dp[i] = inf;
    for(int j = i - 1; j >= 0; j--) {
      dp[i] = min(dp[i], 1LL * m * (n - j) + dp[j]);
      m = max(m, a[j]);
    }
  }
  printf("%lld\n", dp[n]);
  return 0;
}

Compilation message (stderr)

Discharging.cpp: In function 'int main()':
Discharging.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ~~~~~^~~~~~~~~~
Discharging.cpp:26:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   for(int i = 1; i <= n; i++) scanf("%d", &a[i]);
                               ~~~~~^~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 0 / 25
• Subtask 4: 0 / 11
• Subtask 5: 14 / 14
• Subtask 6: 0 / 28