Submission #317617

#	Time	Username	Problem	Language	Result	Execution time	Memory
317617		VROOM_VARUN	Holiday (IOI14_holiday)	C++14	7 / 100	181 ms	14484 KiB

holiday

/*
ID: varunra2
LANG: C++
TASK: holiday
*/

#include <bits/stdc++.h>

#include "holiday.h"
using namespace std;

#ifdef DEBUG
#include "lib/debug.h"
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define debug_arr(...) \
  cerr << "[" << #__VA_ARGS__ << "]:", debug_arr(__VA_ARGS__)
#pragma GCC diagnostic ignored "-Wsign-compare"
//#pragma GCC diagnostic ignored "-Wunused-parameter"
//#pragma GCC diagnostic ignored "-Wunused-variable"
#else
#define debug(...) 42
#endif

#define EPS 1e-9
#define IN(A, B, C) assert(B <= A && A <= C)
#define INF (int)1e9
#define MEM(a, b) memset(a, (b), sizeof(a))
#define MOD 1000000007
#define MP make_pair
#define PB push_back
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.end(), cont.begin()
#define x first
#define y second

const double PI = acos(-1.0);
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef map<int, int> MPII;
typedef multiset<int> MSETI;
typedef set<int> SETI;
typedef set<string> SETS;
typedef vector<int> VI;
typedef vector<PII> VII;
typedef vector<VI> VVI;
typedef vector<string> VS;

#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define trav(a, x) for (auto& a : x)
#define sz(x) (int)(x).size()
typedef pair<int, int> pii;
typedef vector<int> vi;
#pragma GCC diagnostic ignored "-Wsign-compare"
// util functions
int n;
int d;
int start;
vector<ll> vals;

void space() {
  debug(
      "asdfjasdlkfjads;lkfjsadl;kjfasdkl;fjasdkl;fjasdl;kfjasdkl;fjaskl;dfjasl;"
      "kdfjas;lkdfjas;lkjfasdkl;");
}

void deb(string s = "") { debug("here" + s); }

struct node {
  int cnt = 0;
  ll sum = 0ll;
};

const int siz = 1 << 5;

vector<node> st(siz * 2);

void upd(int node, int l, int r, int ind, int cnt, int sum) {
  if (l > r) return;
  if (l > ind or r < ind) return;
  if (l == r) {
    assert(l == ind);
    st[node].cnt = cnt;
    st[node].sum = sum;
    return;
  }
  int m = (l + r) / 2;
  upd(2 * node + 1, l, m, ind, cnt, sum);
  upd(2 * node + 2, m + 1, r, ind, cnt, sum);
  st[node].sum = st[2 * node + 1].sum + st[2 * node + 2].sum;
  st[node].cnt = st[2 * node + 1].cnt + st[2 * node + 2].cnt;
}

ll qry(int node, int cnt) {
  if (st[node].cnt <= cnt) return st[node].sum;
  if (cnt <= 0) return 0;
  return qry(2 * node + 1, cnt) + qry(2 * node + 2, cnt - st[2 * node + 1].cnt);
}

void upd(int ind, int cnt, int sum) {
  // debug("in upd");
  upd(0, 0, siz - 1, ind, cnt, sum);
  // debug("out upd");
}

ll qry(int cnt) {
  // debug("in qry");
  ll ret = qry(0, cnt);
  // debug("out qry");
  return ret;
}

void empt() {
  // basically clear the segtree
  for (int i = 0; i < siz; i++) {
    upd(i, 0, 0);
  }
}

VI inds;
VI use;

void dnc(int l, int r, int optl, int optr, int jmp, vector<ll>& dp) {
  if (l > r) return;
  // debug("here", optl, optr);
  int mid = (l + r) / 2;
  pair<ll, int> best = MP(-INF, 1);
  for (int k = optl; k <= optr; k++) {
    // debug(k, mid);
    upd(inds[k], 1, use[k]);
    ll ret = qry(mid - jmp * k);
    // debug(ret, mid, jmp, k);
    best = max(best, MP(ret, -k));
  }
  dp[mid] = best.x;
  int opt = -best.y;
  // debug(opt,
  // "asdlfjaslkfasd;lkfjasdkl;ajsd;lkjsad;jdasfklas;klfjsdal;kfajsdkl;"
  // "fasdjl;fkasdjfl;kasdj");
  // debug("end of my dnc :yay:");
  for (int k = optl; k <= optr; k++) {
    upd(inds[k], 0, 0);
  }
  dnc(l, mid - 1, optl, opt, jmp, dp);
  // debug(l, r, optl, opt, optr);
  for (int k = optl; k < opt; k++) {
    upd(inds[k], 1, use[k]);
  }
  dnc(mid + 1, r, opt, optr, jmp, dp);
  // debug(l, r, 2);
  // debug("end of dnc");
  // for (int k = optl; k <= optr; k++) {
  // upd(inds[k], 0, 0);
  // }
}

pair<vector<ll>, vector<ll>> solve(VI& vals, bool st) {
  // we have to make inds and use
  // deb("1");
  int m = sz(vals);
  vector<ll> dp1(d + 5, 0);
  vector<ll> dp2(d + 5, 0);

  if (m == 0) {
    return MP(dp1, dp2);
  }
  VII cop(m);
  for (int i = 0; i < m; i++) {
    cop[i] = MP(vals[i], i);
  }

  inds.clear();
  use.clear();
  inds.resize(m);
  use.resize(m);
  sort(all(cop), greater<PII>());
  for (int i = 0; i < m; i++) {
    inds[cop[i].y] = i;
  }
  use = vals;
  // space();
  // deb("dnc1");
  empt();
  dnc(0, d, 0, m - 1, 1, dp1);
  // space();
  // deb("dnc2");
  empt();
  dnc(0, d, 0, m - 1, 2, dp2);
  if (st) {
    for (int i = d + 4; i > 0; i--) {
      dp1[i] = dp1[i - 1];
      if (i > 1) dp2[i] = dp2[i - 2];
    }
    dp1[0] = 0;
    dp2[0] = 0;
    dp2[1] = 0;
  }

  // debug(dp1);
  // debug(dp2);
  // debug(inds);
  // debug(use);
  // debug(cop);
  // debug(vals);
  // debug(
  // "asdfljaslkdfajskl;fjasd;lkfjaslkdfjaslk;fjasd;lkfsad;lkfjasdl;"
  // "fjadfjlsjflskfj;lkjasd;lfjas;");

  return MP(dp1, dp2);
}

ll findMaxAttraction(int n, int start, int d, int attraction[]) {
  ::n = n;
  ::start = start;
  ::d = d;
  vals.resize(n);
  for (int i = 0; i < n; i++) {
    vals[i] = attraction[i];
  }
  VI gp1, gp2;
  for (int i = 0; i < n; i++) {
    if (i < start)
      gp1.PB(vals[i]);
    else
      gp2.PB(vals[i]);
  }
  reverse(all(gp1));
  // deb();
  auto x = solve(gp1, true);
  // deb();
  auto y = solve(gp2, false);
  ll ret = 0;
  // deb();
  for (int i = 0; i <= d; i++) {
    ret = max(ret, max(x.x[i] + y.y[d - i], y.x[i] + x.y[d - i]));
  }
  // deb();
  return ret;
}

// int main() {
// #ifndef ONLINE_JUDGE
//   freopen("holiday.in", "r", stdin);
//   freopen("holiday.out", "w", stdout);
// #endif
//   cin.sync_with_stdio(0);
//   cin.tie(0);

//   int n, start, d;
//   cin >> n >> start >> d;
//   int attraction[n];

//   for (int i = 0; i < n; i++) cin >> attraction[i];

//   cout << findMaxAttraction(n, start, d, attraction) << '\n';

//   return 0;
// }

Compilation message (stderr)

holiday.cpp: In function 'void space()':
holiday.cpp:21:20: warning: statement has no effect [-Wunused-value]
   21 | #define debug(...) 42
      |                    ^~
holiday.cpp:62:3: note: in expansion of macro 'debug'
   62 |   debug(
      |   ^~~~~
holiday.cpp: In function 'void deb(std::string)':
holiday.cpp:21:20: warning: statement has no effect [-Wunused-value]
   21 | #define debug(...) 42
      |                    ^~
holiday.cpp:67:27: note: in expansion of macro 'debug'
   67 | void deb(string s = "") { debug("here" + s); }
      |                           ^~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 23
• Subtask 3: 0 / 17
• Subtask 4: 0 / 53