Submission #104101

#	Time	Username	Problem	Language	Result	Execution time	Memory
104101		turbat	The Big Prize (IOI17_prize)	C++14	0 / 100	80 ms	316 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
using vi = vector <int>;
using pii = pair <int, int>;
#define pb push_back
#define mp make_pairdefine F first
#define S second
#define N 200005
int mx;
int fen[N];
void add(int x){
	x++;
	while (x < N){
		fen[x]++;
		x += x & -x;
	}
}
int sum(int x){
	x++;
	int s = 0;
	while (x){
		s += fen[x];
		x -= x & -x;
	}
	return s;
}
int gg(int l, int r){
	vi tmp;
	if (l == r) {
		tmp = ask(l); 
		if (tmp[0] + tmp[1] == 0) return l;
		return -1;
	}
	while(l <= r){
		tmp = ask(r);
		if (tmp[0] + tmp[1] == 0) return r;
		if (tmp[0] + tmp[1] == mx) break;
		add(r);
		r--;
	}
	if (l > r) return -1;
	if (tmp[0] == sum(l - 1)) return -1;
	if (l == r) return gg(l, r);
	int mid = (l + r) / 2;
	return max(gg(l, mid), gg(mid + 1, r));
}
int find_best(int n) {
	int s[505];
	// for (int i = 0;i < 500;i++){
	// 	vi ans = ask(i);
	// 	s[i] = ans[0] + ans[1];
	// 	if (!s[i]) return i;
	// 	mx = max(mx, s[i]);
	// }
	// for (int i = 0;i * i < n;i++)
	// 	if (s[i] != mx)
	// 		add(i);
	vi ans = ask(0);
	mx = ans[0] + ans[1];
	return gg(0, n - 1);
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:49:6: warning: unused variable 's' [-Wunused-variable]
  int s[505];
      ^

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