oj.uz

Submission #70954

# Submission time Handle Problem Language Result Execution time Memory
70954 2018-08-23T20:31:24 Z thebes Aliens (IOI07_aliens) C++14
100 / 100
 5 ms 560 KB 
#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;
		if(!get(x-m,y)) hi=m;
		else lo=m+1;
	}
	lo--; M = 1+lo+d; a=0;
	x += (M/2)-lo;
	for(i=0;y+(1LL<<i)<=N;i++){
		if(!get(x,y+(1LL<<i))) break;
	}
	lo = 1, hi = 1LL<<i;
	while(lo<hi){
		int m=lo+hi>>1;
		if(!get(x,y+m)) hi=m;
		else lo=m+1;
	}
	lo--; y -= (M/2)-lo;
	int l=0, r=0, u=0, d=0;
	for(i=1;2*M*i+x<=N;i++){
		if(!get(x+2*M*i,y)) break;
	}
	r = i-1;
	for(i=1;x-2*M*i>=1;i++){
		if(!get(x-2*M*i,y)) break;
	}
	l = i-1;
	for(i=1;y+2*M*i<=N;i++){
		if(!get(x,y+2*M*i)) break;
	}
	u = i-1;
	for(i=1;y-2*M*i>=1;i++){
		if(!get(x,y-2*M*i)) break;
	}
	d = i-1;
	if(l+r==1){
		if(!r) x -= M;
		else x += M;
		if(!u) y -= M;
		else y += M;
	}
	else{
		x += 2*M*(r-1);
		y += 2*M*(u-1);
	}
	printf("solution %d %d\n",(signed)x,(signed)y);
	fflush(stdout);
	return 0;
}//19 5 16

Compilation message

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
10.0 / 10.0

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

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 388 KB Output is correct
2 Correct 3 ms 472 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 472 KB Output is correct
2 Correct 2 ms 472 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 472 KB Output is correct
2 Correct 3 ms 472 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 472 KB Output is correct
2 Correct 2 ms 472 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 472 KB Output is correct
2 Correct 3 ms 500 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 500 KB Output is correct
2 Correct 3 ms 500 KB Output is correct
3 Correct 4 ms 500 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 500 KB Output is correct
2 Correct 3 ms 500 KB Output is correct
3 Correct 4 ms 500 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 500 KB Output is correct
2 Correct 5 ms 560 KB Output is correct
3 Correct 3 ms 560 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 560 KB Output is correct
2 Correct 4 ms 560 KB Output is correct
3 Correct 2 ms 560 KB Output is correct