Submission #1012685

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012685		Tob	Jousting tournament (IOI12_tournament)	C++14	100 / 100	138 ms	32596 KiB

tournament

#include <bits/stdc++.h>

#define F first
#define S second
#define all(x) x.begin(), x.end()
#define pb push_back
#define FIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

using namespace std;

typedef long long ll;
typedef pair <ll, ll> pii;


#define inbuf_len 1 << 16
#define outbuf_len 1 << 16

//-------------------

const int maxn = 1e5 + 7, ofs = (1 << 17), inf = 0x3f3f3f3f;

int t[2*ofs], fen[maxn];
set <int> st[maxn];
vector <int> ad[maxn], re[maxn];

void update(int x, int val) {
	x += ofs;
	t[x] = val;
	while (x /= 2) t[x] = min(t[2*x], t[2*x+1]);
}
int query(int x, int a, int b, int lo = 0, int hi = ofs-1) {
	if (b < lo || hi < a) return inf;
	if (a <= lo && hi <= b) return t[x];
	int mid = (lo + hi) / 2;
	return min(query(2*x, a, b, lo, mid), query(2*x+1, a, b, mid+1, hi));
}

void add(int x, int val) {for (x++; x < maxn; x += x & -x) fen[x] += val;}
int suma(int x) {
	int out = 0;
	for (x++; x; x -= x & -x) out += fen[x];
	return out;
}
int get(int x) {
	x++;
	int sum = 0, y = 0;
	for (int i = 16; i >= 0; i--) {
		if (y+(1<<i) >= maxn) continue;
		if (sum + fen[y+(1<<i)] < x) {
			y += (1 << i);
			sum += fen[y];
		}
	}
	return y;
}

int GetBestPosition(int n, int c, int R, int *K, int *S, int *E) {
	memset(t, inf, sizeof t);
	set <pii> s; s.insert({n, n});
	for (int i = 0; i < n; i++) {
		add(i, 1);
		s.insert({i, i});
		st[i].insert(inf);
	}
	vector <int> le(c), ri(c);
	for (int i = 0; i < c; i++) {
		int l = S[i], r = E[i];
		int x = get(l), y = get(r);
		auto p = s.lower_bound({x, 0});
		while (p -> F <= y) {
			add(p -> F, -1);
			p = s.erase(p);
		}
		add(x, 1);
		le[i] = x;
		ri[i] = p -> F - 1;
		s.insert({le[i], ri[i]});
		ad[le[i]].pb(i);
		re[ri[i]].pb(i);
	}
	memset(fen, 0, sizeof fen);
	vector <int> pre(n-1, -1), suf(n-1, -1);
	for (int i = 0; i < n-1; i++) {
		if (i) pre[i] = pre[i-1];
		if (K[i] > R) pre[i] = i;
	}
	for (int i = n-2; i >= 0; i--) {
		if (i < n-2) suf[i] = suf[i+1];
		if (K[i] > R) suf[i] = i;
	}
	int mx = 0, poz = 0;
	for (int i = 0; i < n; i++) {
		for (auto x : ad[i]) {
			st[le[x]].insert(x);
			st[ri[x]].insert(x);
			update(le[x], *st[le[x]].begin());
			update(ri[x], *st[ri[x]].begin());
			add(x, 1);
		}
		int rj = c;
		if (i && pre[i-1] != -1) rj = min(rj, query(1, 0, pre[i-1]));
		if (i < n-1 && suf[i] != -1) rj = min(rj, query(1, suf[i]+1, n-1));
		rj = suma(rj-1);
		if (rj > mx) {
			mx = rj;
			poz = i;
		}
		for (auto x : re[i]) {
			st[le[x]].erase(x);
			st[ri[x]].erase(x);
			update(le[x], *st[le[x]].begin());
			update(ri[x], *st[ri[x]].begin());
			add(x, -1);
		}
	}
	return poz;
}

//-------------------
/*
int main() {
  int tmp;

  char *inbuf, *outbuf;
  inbuf = (char*) malloc(inbuf_len * sizeof(char));
  outbuf = (char*) malloc(outbuf_len * sizeof(char));
  tmp = setvbuf(stdin, inbuf, _IOFBF, inbuf_len);
  assert(tmp == 0);
  tmp = setvbuf(stdout, outbuf, _IOFBF, outbuf_len);
  assert(tmp == 0);

  int N, C, R;
  int *K, *S, *E;
  tmp = scanf("%d %d %d", &N, &C, &R);
  assert(tmp == 3);
  K = (int*) malloc((N-1) * sizeof(int));
  S = (int*) malloc(C * sizeof(int));
  E = (int*) malloc(C * sizeof(int));
  int i;
  for (i = 0; i < N-1; i++) {
    tmp = scanf("%d", &K[i]);
    assert(tmp == 1);
  }
  for (i = 0; i < C; i++) {
    tmp = scanf("%d %d", &S[i], &E[i]);
    assert(tmp == 2);
  }

  printf("%d\n", GetBestPosition(N, C, R, K, S, E));

  return 0;

}
*/
/*
5 3 3
1
0
2
4
1 3
0 1
0 1
*/

• Subtask 1: 17 / 17
• Subtask 2: 32 / 32
• Subtask 3: 51 / 51