제출 #882801

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
882801		MilosMilutinovic	Chorus (JOI23_chorus)	C++14	40 / 100	7032 ms	604 KiB

chorus

#include <bits/stdc++.h>
 
using namespace std;

struct line {
  long long k, n;
  void init() {
    k = 0;
    n = (long long) 1e18;
  }
  long long val(long long x) {
    return k * x + n;
  }
};

const int MAX = 5e6;

line li[MAX];
int ls[MAX], rs[MAX], tsz, root;

void Update(int& x, int l, int r, line ln) {
  if (!x) {
    x = ++tsz;
    li[x].init();
  }
  int mid = l + r >> 1;
  if (li[x].val(mid) > ln.val(mid)) {
    swap(li[x], ln);
  }
  if (l == r) {
    return;
  }
  if (ln.val(l) < li[x].val(l)) {
    Update(ls[x], l, mid, ln);
  } else {
    Update(rs[x], mid + 1, r, ln);
  }
}

long long Query(int x, int l, int r, int i) {
  if (!x) {
    return (long long) 1e18;
  }
  if (l == r) {
    return li[x].val(i);
  }
  int mid = l + r >> 1;
  if (i <= mid) {
    return min(Query(ls[x], l, mid, i), li[x].val(i));
  } else {
    return min(Query(rs[x], mid + 1, r, i), li[x].val(i));
  }
}

void clear_seg() {
  while (tsz > 0) {
    ls[tsz] = 0;
    rs[tsz] = 0;
    li[tsz].init();
    tsz -= 1;
  }
  root = 0;
}
 
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, k;
  cin >> n >> k;
  string s;
  cin >> s;
  vector<int> a, b;
  for (int i = 0; i < 2 * n; i++) {
    if (s[i] == 'A') {
      a.push_back(i);
    } else {
      b.push_back(i);
    }
  }
  vector<int> ia(2 * n);
  for (int i = 0; i < n; i++) {
    ia[a[i]] = i + 1;
  }
  vector<int> pref(2 * n);
  for (int i = 0; i < 2 * n; i++) {
    if (i > 0) {
      pref[i] = pref[i - 1];
    }
    pref[i] += (s[i] == 'A' ? 1 : 0);
  }
  vector<int> ib(2 * n);
  for (int i = 0; i < n; i++) {
    ib[b[i]] = pref[b[i]];
  }
  for (int i = 0; i < n; i++) {
    if (i > 0) {
      pref[i] = pref[i - 1];
    } else {
      pref[i] = 0;
    }
    pref[i] += ib[b[i]];
  }
  auto Cost = [&](int L, int R) {
    long long ret = 0;
    for (int i = L; i <= R; i++) {
      ret += max(0, ia[a[R]] - ib[b[i]]);
    }
    return ret;
  }; 
  auto Solve = [&](long long mid) {
    vector<pair<long long, int>> dp(n + 1);
    for (int i = 0; i <= n; i++) {
      dp[i] = {1e18, 0};
    }
    dp[0] = {0, 0};
    for (int i = 0; i < n; i++) {
      for (int j = i; j < n; j++) {
        long long new_dp = dp[i].first + Cost(i, j);
        dp[j + 1] = min(dp[j + 1], {new_dp + mid, dp[i].second + 1});
      }
    }
    return dp[n];
  };
  long long low = 0, high = 1e15, p = 0;
  while (low <= high) {
    long long mid = low + high >> 1;
    pair<long long, int> res = Solve(mid);
    if (res.second <= k) {
      p = mid;
      high = mid - 1;
    } else {
      low = mid + 1;
    }
  }
  pair<long long, int> res = Solve(p);
  cout << res.first - p * k << '\n';
  /* const int inf = (int) 1e9;
  vector<long long> dp(n + 1, inf);
  dp[0] = 0;
  for (int foo = 0; foo < k; foo++) {
    vector<long long> new_dp(n + 1, inf);
    int ptr = -1;
    multiset<long long> st;
    clear_seg();
    for (int i = 0; i < n; i++) {
      st.insert(dp[i]);
      while (ptr + 1 <= i && ia[a[i]] >= ib[b[ptr + 1]]) {
        ptr += 1;
        line cur;
        cur.k = -ptr;
        cur.n = dp[ptr] + (ptr == 0 ? 0 : pref[ptr - 1]);
        Update(root, 0, n, cur);
        st.erase(st.find(dp[ptr]));
      }
      if (!st.empty()) {
        new_dp[i + 1] = min(new_dp[i + 1], *st.begin());
      }
      if (ptr != -1) {
        new_dp[i + 1] = min(new_dp[i + 1], Query(root, 0, n, ia[a[i]]) + ia[a[i]] * 1LL * (ptr + 1) - pref[ptr]);
      }
    }
    swap(dp, new_dp);
  }
  cout << dp[n] << '\n'; */
  return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

chorus.cpp: In function 'void Update(int&, int, int, line)':
chorus.cpp:26:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   26 |   int mid = l + r >> 1;
      |             ~~^~~
chorus.cpp: In function 'long long int Query(int, int, int, int)':
chorus.cpp:47:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |   int mid = l + r >> 1;
      |             ~~^~~
chorus.cpp: In function 'int main()':
chorus.cpp:126:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  126 |     long long mid = low + high >> 1;
      |                     ~~~~^~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 0 / 21
• Subtask 4: 0 / 26
• Subtask 5: 0 / 13