Submission #198682

#	Time	Username	Problem	Language	Result	Execution time	Memory
198682		sjimed	Aliens (IOI07_aliens)	C++14	0 / 100	9 ms	524 KiB

aliens

#include<bits/stdc++.h>  
using namespace std;  
  
#define fast ios::sync_with_stdio(false);cin.tie(NULL)  
#define fi first  
#define se second  
#define all(v) (v).begin(),(v).end()  
#define pb push_back  
#define eb emplace_back
#define pre(a) cout<<fixed; cout.precision(a)
#define mp make_pair
  
typedef long long ll;  
typedef pair<int,int> pii;  
typedef pair<ll,ll> pll;  
const long long INF = 1e18;  
const int inf = 1e9;

int n, M;
ll x, y;
pll s, e;
pll ans;

bool ask(ll i, ll j) {
	cout << "examine " << i << " " << j << endl;

	string s;
	cin >> s;

	return s == "true";
}

bool q(ll i, ll j) {
	if(!ask(i, j)) return false;
	i = i + x >> 1;
	j = j + y >> 1;
	if(!ask(i, j)) return false;
	i = i + x >> 1;
	j = j + y >> 1;
	if(!ask(i, j)) return false;

	return true;
}

int main() {
	cin >> n >> x >> y;

	ll l = x, r = n;

	while(l != r) {
		ll m = l + r + 1 >> 1;

		if(q(m, y)) l = m;
		else r = m-1;
	}

	e.fi = l;

	l = 1, r = x;

	while(l != r) {
		ll m = l + r >> 1;

		if(q(m, y)) r = m;
		else l = m+1;
	}

	s.fi = l;

	l = y, r = n;

	while(l != r) {
		ll m = l + r + 1 >> 1;

		if(q(x, m)) l = m;
		else r = m-1;
	}

	e.se = l;

	l = 1, r = y;

	while(l != r) {
		ll m = l + r >> 1;

		if(q(x, m)) r = m;
		else l = m+1;
	}

	s.se = l;

	x = s.fi + e.fi >> 1;
	y = s.se + e.se >> 1;

	M = e.se - s.se + 1;

	cout << x << " " << y << endl;

	ll cnt = 0;
	for(ll i = x - 4*M; i<=x + 4*M; i += 2*M) {
		if(i < 1 || i > n) continue;

		if(ask(i, y)) cnt++, ans.fi += i;
	}

	ans.fi /= cnt;

	cnt = 0;
	for(ll i = y - 4*M; i<=y + 4*M; i += 2*M) {
		if(i < 1 || i > n) continue;

		if(ask(x, i)) cnt++, ans.se += i;
	}

	ans.se /= cnt;

	cout << "solution " << ans.fi << " " << ans.se << endl;
}

Compilation message (stderr)

aliens.cpp: In function 'bool q(ll, ll)':
aliens.cpp:35:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  i = i + x >> 1;
      ~~^~~
aliens.cpp:36:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  j = j + y >> 1;
      ~~^~~
aliens.cpp:38:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  i = i + x >> 1;
      ~~^~~
aliens.cpp:39:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  j = j + y >> 1;
      ~~^~~
aliens.cpp: In function 'int main()':
aliens.cpp:51:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r + 1 >> 1;
          ~~~~~~^~~
aliens.cpp:62:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r >> 1;
          ~~^~~
aliens.cpp:73:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r + 1 >> 1;
          ~~~~~~^~~
aliens.cpp:84:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r >> 1;
          ~~^~~
aliens.cpp:92:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  x = s.fi + e.fi >> 1;
           ^
aliens.cpp:93:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  y = s.se + e.se >> 1;
           ^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10