Submission #70954

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
70954	2018-08-23 20:31:24	thebes	Aliens (IOI07_aliens)	C++14	100 / 100	5 ms	560 KiB

aliens

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#include <bits/stdc++.h>
using namespace std;
#define int long long
int N, M, x, y, i, d, a, lo, hi;
string inp;
bool get(int x,int y){
  printf("examine %d %d\n",(signed)x,(signed)y);
  fflush(stdout);
  cin >> inp;
  return inp == "true";
}
signed main(){
  scanf("%lld%lld%lld",&N,&x,&y);
  for(i=0;x+(1LL<<i)<=N;i++){
    if(!get(x+(1LL<<i),y)) break;
  }
  lo = 1, hi = 1LL<<i;
  while(lo<hi){
    int m=lo+hi>>1;
    if(!get(x+m,y)) hi=m;
    else lo=m+1;
  }
  lo--; d = lo; a = 0;
  for(i=0;x-(1LL<<i)>=1;i++){
    if(!get(x-(1LL<<i),y)) break;
  }
  lo = 1, hi = 1LL<<i;
  while(lo<hi){
    int m=lo+hi>>1;
 
 
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Compilation message (stderr)

aliens.cpp: In function 'int main()':
aliens.cpp:20:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=lo+hi>>1;
         ~~^~~
aliens.cpp:30:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=lo+hi>>1;
         ~~^~~
aliens.cpp:41:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=lo+hi>>1;
         ~~^~~
aliens.cpp:46:21: warning: variable 'd' set but not used [-Wunused-but-set-variable]
  int l=0, r=0, u=0, d=0;
                     ^
aliens.cpp:14:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld%lld",&N,&x,&y);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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