제출 #77144

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
77144		doowey	Aliens (IOI07_aliens)	C++14	0 / 100	3 ms	540 KiB

aliens

#pragma optimize ("O3")
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef double ld;
typedef pair<ll,int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ab(x) ((x) < 0 ? -(x) : (x))
#define all(x) ((x).begin(),(x).end())
#define len(x) ((int)(x).size())

ll n;

bool ask(ll xi, ll yi){
	if(xi <= 0)
		return false;
	if(yi <= 0)
		return false;
	if(xi > n)
		return false;
	if(yi > n)
		return false;
	printf("examine %d %d\n", (int)xi, (int)yi);
	fflush(stdout);
	string answer;
	cin >> answer;
	return answer == "true";
}

int main(){
	ll x0, y0;
	scanf("%lld %lld %lld", &n, &x0, &y0);
	ll L = x0 + 1, R = x0 + 1;
	for(ll i = 0;i < 32; i ++ ){
		if(!ask(x0 + (1 << i), y0)){
			R = x0 + (1 << i);
			break;
		}
	}
	ll md;
	
	ll lasx, lasy;
	
	while(L < R){
		md = (L + R) / 2;
		if(ask(md, y0))
			L = md + 1;
		else
			R = md;
	}
	ll tl = R - x0;
	
	lasx = R - 1;
	
	R = x0;
	L = x0;
	for(ll i = 0;i < 32; i ++ ){
		if(!ask(x0 - (1 << i), y0)){
			L = x0 - (1 << i);
			break;
		}
	}
	while(L < R){
		md = (L + R) / 2;
		if(ask(md, y0))
			R = md;
		else
			L = md + 1;
	}
	tl += x0 - L;
	
	ll M = tl;
	
	L = y0, R = y0 + M - 1;
	while(L < R){
		md = (L + R) / 2;
		if(!ask(x0, md))
			R = md;
		else
			L = md + 1;
	}
	-- L;
	lasy = L + 1;
	
	for(ll i = 1;i <= 3; i ++ ){
		if(ask(lasx + 2 * M, lasy))
			lasx += 2 * M;
		else
			break;
	}
	
	for(ll i = 1; i <= 3; i ++ ){
		if(ask(lasx, lasy + 2 * M))
			lasy += 2 * M;
		else
			break;
	}
	if(ask(lasx + M, lasy + M))
		lasx += M, lasy += M;
	lasx -= 2 * M;
	lasy -= 2 * M;
	lasx -= M / 2;
	lasy -= M / 2;
	printf("solution %d %d\n", (int)lasx, (int)lasy);
	fflush(stdout);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

aliens.cpp:1:0: warning: ignoring #pragma optimize  [-Wunknown-pragmas]
 #pragma optimize ("O3")
 
aliens.cpp: In function 'int main()':
aliens.cpp:38:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld %lld", &n, &x0, &y0);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
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