Submission #605859

#	Time	Username	Problem	Language	Result	Execution time	Memory
605859		cheissmart	Teams (IOI15_teams)	C++14	21 / 100	4062 ms	18272 KiB

teams

#include "teams.h"
#include <bits/stdc++.h>
#define F first
#define S second
#define V vector
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(), (v).end()

using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
typedef V<int> vi;

const int INF = 1e9 + 7, N = 5e5 + 7;

int n;
int l[N], r[N];
vi p;

void init(int _n, int _l[], int _r[]) {
	n = _n;
	for(int i = 0; i < n; i++)
		l[i] = _l[i], r[i] = _r[i];

	p = vi(n); iota(ALL(p), 0);
	sort(ALL(p), [&] (int x, int y) {
		return r[x] < r[y];
	});
}

int qry(int x, int lb, int rb) {
	int ans = 0;
	for(int i = lb; i < rb; i++) {
		if(l[p[i]] <= x)
			ans++;
	}
	return ans;
}

int find_who(int lb, int rb, int at_least, int cnt) {
	for(int i = at_least; i < n; i++) {
		if(lb < l[p[i]] && l[p[i]] <= rb) {
			if(cnt == 0) return i;
			cnt--;
		}
	}
	throw;
}

struct seg {
	int r, hi;
};

int can(int m, int a[]) {
	if(accumulate(a, a + m, 0LL) > n) return 0;
	sort(a, a + m);

	V<seg> stk;
	stk.PB({0, n});
	for(int i = 0, j = 0; i < m; i++) {
		while(j < n && r[p[j]] < a[i]) j++;
		while(stk.back().hi < j) {
			assert(SZ(stk));
			stk.pop_back();
		}
		int need = a[i], at_least = j;
		while(need && SZ(stk)) {
			int lb = stk.back().r, rb = a[i]; // (lb, rb]
			int cnt = qry(rb, at_least, stk.back().hi) - qry(lb, at_least, stk.back().hi);
			if(cnt < need) {
				at_least = stk.back().hi;
				stk.pop_back();
				need -= cnt;
			} else if(cnt == need) {
				at_least = stk.back().hi;
				stk.pop_back();
				stk.PB({a[i], at_least});
				need -= cnt;
				break;
			} else {
				int who = find_who(lb, rb, at_least, need);
				stk.PB({a[i], who});
				break;
			}
		}
		if(stk.empty()) return 0;
	}
	return 1;
}

• Subtask 1: 21 / 21
• Subtask 2: 0 / 13
• Subtask 3: 0 / 43
• Subtask 4: 0 / 23