Submission #104064

#	Time	Username	Problem	Language	Result	Execution time	Memory
104064		RockyB	The Big Prize (IOI17_prize)	C++17	0 / 100	80 ms	3680 KiB

prize

/// In The Name Of God
 
#include <bits/stdc++.h>
#ifndef IOI2018
#include "prize.h"
#endif
 
#define f first
#define s second
 
#define pb push_back
#define pp pop_back
#define mp make_pair
 
#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()
 
#define rep(i, l, r) for (int i = (l); i < (r); i++)
#define per(i, l, r) for (int i = (l); i >= (r); i--)
 
#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
 
#define nl '\n'
#define ioi exit(0);
 
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
 
const int N = (int)5e5 + 7;
const int inf = (int)1e9 + 7;
const int mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;
 
const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1};
const int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};
 
using namespace std;
 
namespace com {
	static const int max_q = 10000;
	static int n;
	static int query_count = 0;
	static vector<int> g;
	static vector<vector<int> > rank_count;
 
}
 
namespace grader {
	using namespace com;
	vector<int> ask(int i) {
		query_count++;
		if(query_count > max_q) {
			cerr << "Query limit exceeded" << endl;
			exit(0);
		}
 
		if(i < 0 || i >= n) {
			cerr << "Bad index: " << i << endl;
			exit(0);
		}
 
		vector<int> res(2);
		res[0] = rank_count[g[i] - 1][i + 1];
		res[1] = rank_count[g[i] - 1][n] - res[0];
		return res;
	}
}
#ifdef IOI2018
using namespace grader;
#endif
 
map <int, vector <int > > dp;
 
int _n;
 
vector <int> get(int p) {
	if (dp.count(p)) return dp[p];
	return dp[p] = ask(p);
}

/*
	if (a[l] < a[r]) -> x[0] != y[0]
	if (a[l] > a[r]) {
		x[0] == y[0] min(l, r) = a[r]
		x[0] > y[0]
	}
*/
/// [5 5 5 5 5 5 5 1 5]
int mx;
int solve(int l, int r, vector <int> x, vector <int> y) {
	if (!(max(x[0], x[1]))) return l;
	if (!(max(y[0], y[1]))) return r;
	if (r - l <= 1) return -1;
	if (x[0] == y[0]) return -1;
	if (x[0] + x[1] != mx || !x[0]) return solve(l + 1, r, get(l + 1), y);
	if (y[0] + y[1] != mx || !y[0]) return solve(l, r - 1, x, get(r - 1));

	int m = l + r >> 1;
	if (rand() & 1) {
		int sol = solve(l, m, x, get(m));
		if (~sol) return sol;
		return solve(m + 1, r, get(m + 1), y);
	}
	int on = solve(m + 1, r, get(m + 1), y);
	if (~on) return on;
	return solve(l, m, x, get(m));
}
int find_best(int n) {
	rep(i, 0, min(500, n)) {
		vector <int> a = get(i);
		if (!max(a[0], a[1])) return i;
		mx = max(mx, a[0] + a[1]);
	}
	return solve(0, n - 1, get(0), get(n - 1));
} 
 
 
namespace read {
	using namespace com;
	void read() {
		cin >> n;
		g.resize(n);
		for(int i = 0; i < n; i++) {
			cin >> g[i];
			if(g[i] < 1) {
				cerr << "Invalid rank " << g[i] << " at index " << i << endl;
				exit(0);
			}
		}
 
		int max_rank = *max_element(g.begin(), g.end());
		rank_count.resize(max_rank + 1, vector<int>(n + 1, 0));
		for(int r = 0; r <= max_rank; r++) {
			for(int i = 1; i <= n; i++) {
				rank_count[r][i] = rank_count[r][i - 1];
				if(g[i - 1] == r)
				  rank_count[r][i]++;
			}
		}
 
		for(int i = 0; i <= n; i++)
			for(int r = 1; r <= max_rank; r++)
				rank_count[r][i] += rank_count[r - 1][i];
 
		int res = find_best(n);
		cout << res;
		ioi
		cout << res << endl << "Query count: " << query_count << endl;
		ioi
	}
}
 
#ifdef IOI2018
int main() {
	#ifdef IOI2018
		freopen ("in.txt", "r", stdin);
		freopen ("slow.out", "w", stdout);
	#endif
	read :: read();
}
#endif

Compilation message (stderr)

prize.cpp: In function 'int solve(int, int, std::vector<int>, std::vector<int>)':
prize.cpp:100:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m = l + r >> 1;
          ~~^~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 80