Submission #43145

#	Time	Username	Problem	Language	Result	Execution time	Memory
43145		RayaBurong25_1	The Big Prize (IOI17_prize)	C++14	94.30 / 100	18 ms	4364 KiB

prize

#include "prize.h"
#include <stdio.h>
#include <vector>
#include <algorithm>
int L[200005], R[200005];
int V[200005];
int min(int a, int b)
{
	return (a < b)?a:b;
}
int max(int a, int b)
{
	return (a > b)?a:b;
}
int find_best(int n) {
	int i, j;
	for (i = 0; i < n; i++)
		L[i] = -1;
	int mn, md, mx;
	//first sig
	std::vector<int> r;
	r = ask(0);
	L[0] = r[0];
	R[0] = r[1];
	if (R[0] == 0)
		return 0;
	r = ask(n - 1);
	L[n - 1] = r[0];
	R[n - 1] = r[1];
	if (L[n - 1] == 0)
		return n - 1;
	int sigl = 0, sigr = n - 1;
	while (sigl < sigr)
	{
		for (i = 0; i < 2; i++)
		{
			for (j = sigr; j > sigl; j--)
				if (L[j] != -1 && L[j] != L[sigr] && R[j] != R[sigr])
					break;
		mn = j;
		mx = sigr;
		while (mx != mn)
		{
			if (mx - mn == 1)
			{
				sigr = mn;
				break;
			}
			md = (mn + mx)/2;
			if (L[md] == -1)
			{
				r = ask(md);
				L[md] = r[0];
				R[md] = r[1];
			}
			if (L[md] == 0 && R[md] == 0)
				return md;
			if (L[md] == L[sigr] && R[md] == R[sigr])
				mx = md;
			else
				mn = md;
		}
		if (L[sigr] == -1)
		{
			r = ask(sigr);
			L[sigr] = r[0];
			R[sigr] = r[1];
		}
		if (L[sigr] == 0 && R[sigr] == 0)
			return sigr;
		}
		// printf("sigl %d sigr %d\n", sigl, sigr);
		for (i = 0; i < 2; i++)
		{
			for (j = sigl; j < sigr; j++)
				if (L[j] != -1 && L[j] != L[sigr] && R[j] != R[sigr])
					break;
		mn = sigl;
		mx = j;
		while (mx != mn)
		{
			if (mx - mn == 1)
			{
				sigl = mx;
				break;
			}
			md = (mn + mx)/2;
			if (L[md] == -1)
			{
				r = ask(md);
				L[md] = r[0];
				R[md] = r[1];
			}
			if (L[md] == 0 && R[md] == 0)
				return md;
			if (L[md] == L[sigl] && R[md] == R[sigl])
				mn = md;
			else
				mx = md;
		}
		if (L[sigl] == -1)
		{
			r = ask(sigl);
			L[sigl] = r[0];
			R[sigl] = r[1];
		}
		if (L[sigl] == 0 && R[sigl] == 0)
			return sigl;
		}
	}
	if (sigl == sigr)
		return sigl;
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:113:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 20 / 20
• Subtask 2: 74.3 / 80