oj.uz

Submission #198701

# Submission time Handle Problem Language Result Execution time Memory
198701 2020-01-27T11:01:27 Z sjimed Aliens (IOI07_aliens) C++14
100 / 100
 7 ms 504 KB 
#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 ll INF = 1e18;  
const int inf = 1e9;

ll 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[0] == 't';
}

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

	ll l = x, r = n;

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

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

	e.fi = l;

	l = 1, r = x;

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

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

	e.se = l;

	l = 1, r = y;

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

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

	s.se = l;

	if(!ask((s.fi + e.fi)/2, y)) M = (e.fi - s.fi + 1) / 3;
	else if(!ask((3 * s.fi + e.fi) / 4, y)) M = (e.fi - s.fi + 1) / 5;
	else M = e.fi - s.fi + 1;

	x = s.fi + M / 2;
	y = s.se + M / 2;

	assert(M > 0);

	ll cnt = 0;
	for(ll i = x-4*M; i <= x+4*M; i += 2LL*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 += 2LL*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

aliens.cpp: In function 'int main()':
aliens.cpp:39:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r + 1 >> 1;
          ~~~~~~^~~
aliens.cpp:50:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r >> 1;
          ~~^~~
aliens.cpp:61:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r + 1 >> 1;
          ~~~~~~^~~
aliens.cpp:72:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll m = l + r >> 1;
          ~~^~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 252 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 248 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 6 ms 504 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 248 KB Output is correct
2 Correct 6 ms 376 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 6 ms 248 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 7 ms 376 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 6 ms 408 KB Output is correct
3 Correct 6 ms 248 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 248 KB Output is correct
2 Correct 6 ms 248 KB Output is correct
3 Correct 6 ms 248 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 248 KB Output is correct
2 Correct 6 ms 248 KB Output is correct
3 Correct 5 ms 376 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 248 KB Output is correct
2 Correct 6 ms 376 KB Output is correct
3 Correct 6 ms 248 KB Output is correct