제출 #867954

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
867954		mgl_diamond	K개의 묶음 (IZhO14_blocks)	C++17	0 / 100	1 ms	2004 KiB

blocks

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<int, int>;

#define foru(i, l, r) for(int i=(l); i<=(r); ++i)
#define ford(i, l, r) for(int i=(l); i>=(r); --i)
#define fore(x, v) for(auto &x : v)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define fi first
#define se second
#define file "input"

void setIO() {
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  if (fopen(file".inp", "r")) {
    freopen(file".inp", "r", stdin);
    freopen(file".out", "w", stdout);
  }
}

const ll INF = 1e18;
const int N = 1e5+5, K = 1e2+2;

int n, k;
ll a[N], prv[N], cur[N], f[N];

int main() {
  setIO();

  cin >> n >> k;
  foru(i, 1, n) {
    cin >> a[i];
    prv[i] = max(prv[i-1], a[i]);
  }

  foru(i, 2, k) {
    stack<int> st;
    memset(f, 0x3f, sizeof(f));
    memset(cur, 0x3f, sizeof(cur));

    foru(j, 1, n) {
      f[j] = prv[j];
      while (!st.empty() && a[st.top()] <= a[j]) {
        f[j] = min(f[j], f[st.top()]);
        st.pop();
      }

      if (f[j] < INF) cur[j] = min(cur[j], f[j] + a[j]);
      if (!st.empty()) cur[j] = min(cur[j], cur[st.top()]);

      st.push(j);
    }

//    foru(j, 1, n) {
//      cout << cur[j] << " ";
//    }
//    cout << "\n";

    foru(j, 1, n) {
      prv[j] = cur[j];
    }
  }

  cout << prv[n];
}

컴파일 시 표준 에러 (stderr) 메시지

blocks.cpp: In function 'void setIO()':
blocks.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen(file".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:20:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     freopen(file".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47