Submission #71493

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
71493	2018-08-24 23:11:54	RezwanArefin01	Aliens (IOI07_aliens)	C++17	100 / 100	5 ms	572 KiB

aliens

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> ii; 
int n;
map<pair<ll, ll>, bool> mp; 
bool get(ll x, ll y) {
  if(x < 1 || x > n || y < 1 || y > n) return 0;
  if(mp.count({x, y})) return mp[{x, y}]; 
  cout << "examine " << x << " " << y << endl;
  string s; cin >> s;
  return mp[{x, y}] = s[0] == 't'; 
}
void ans(ll x, ll y) {
  cout << "solution " << x << " " << y << endl;
}
ll find(ll x, ll y, ll dx, ll dy) {
  ll d = 1; 
  while(get(x + dx * d, y + dy * d)) d <<= 1; 
  ll lo = d >> 1, hi = d, idx; 
  while(lo <= hi) {
    ll mid = lo + hi >> 1; 
    if(get(x + dx * mid, y + dy * mid))
      lo = mid + 1, idx = mid; 
 
 
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Compilation message (stderr)

aliens.cpp: In function 'll find(ll, ll, ll, ll)':
aliens.cpp:28:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll mid = lo + hi >> 1; 
            ~~~^~~~
aliens.cpp: In function 'int main(int, const char**)':
aliens.cpp:45:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  ll xc = xr + xl >> 1, yc = yl + yr >> 1; 
          ~~~^~~~
aliens.cpp:45:32: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  ll xc = xr + xl >> 1, yc = yl + yr >> 1; 
                             ~~~^~~~
aliens.cpp: In function 'll find(ll, ll, ll, ll)':
aliens.cpp:32:11: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  } return idx;
           ^~~

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