Submission #547811

#	Time	Username	Problem	Language	Result	Execution time	Memory
547811		MilosMilutinovic	Aliens (IOI07_aliens)	C++14	10 / 100	3 ms	464 KiB

aliens

#include <bits/stdc++.h>
using namespace std;
#define y0 y1231
#define y1 y132131
int n,x,y,x0,y0,x1,y1,x2,y2,x3,y3;
bool Ask(int X,int Y){
	printf("examine %d %d\n",X,Y);
	fflush(stdout);
	char s[6];
	scanf("%s",s);
	return s[0]=='t';
}
int main(){
	scanf("%d%d%d",&n,&x,&y);
	int low=0,high=x-1,ans=0;
	while(low<=high){
		int mid=(low+high)/2;
		if(Ask(x-mid,y))ans=mid,low=mid+1;
		else high=mid-1;
	}
	x0=x-ans,y0=y;
	{
		int low=0,high=n-x-1,ans=0;
		while(low<=high){
			int mid=(low+high)>>1;
			if(Ask(x+mid,y))ans=mid,low=mid+1;
			else high=mid-1;
		}
		x1=x+ans,y1=y;
	}
	{
		int low=0,high=y-1,ans=0;
		while(low<=high){
			int mid=(low+high)>>1;
			if(Ask(x,y-mid))ans=mid,low=mid+1;
			else high=mid-1;
		}
		x2=x,y2=y-ans;
	}
	{
		int low=0,high=n-y-1,ans=0;
		while(low<=high){
			int mid=(low+high)>>1;
			if(Ask(x,y+mid))ans=mid,low=mid+1;
			else high=mid-1;
		}
		x3=x,y3=y+ans;
	}
	int lx=x1-x0+1,ly=y3-y2+1;
	for(int d:{1,3,5}){
		if(lx%d!=0)continue;
		int m=lx/d;
		if(ly%m!=0||(ly/d!=1&&ly/m!=3&&ly/m!=5))continue;
		if(m%2==0)continue;
		int xl=x0,xr=x1,yl=y2,yr=y3;
		while(xl>2*m){
			if(Ask(xl-2*m,y0)||(y>m&&Ask(x1-2*m,y0-m)||(y<=m&&y+m<=n&&Ask(x1-2*m,y0+m))))xl-=2*m;
			else break;
		}
		while(xr+2*m<=n){
			if(Ask(xr+2*m,y0)||(y>m&&Ask(xr+2*m,y0-m)||(y<=m&&y+m<=n&&Ask(xr+2*m,y0+m))))xr+=2*m;
			else break;
		}
		while(yl>2*m){
			if(Ask(x0,yl-2*m)||(x>m&&Ask(x,yl-2*m)||(x<=m&&x+m<=n&&Ask(x,yl-2*m))))yl-=2*m;
			else break;
		}
		while(yr+2*m<=n){
			if(Ask(x0,yr+2*m)||(x>m&&Ask(x,yr+2*m)||(x<=m&&x+m<=n&&Ask(x,yr+2*m))))yr+=2*m;
			else break;
		}
		if(xr-xl+1==5*m&&yr-yl+1==5*m){
			printf("solution %d %d",xl+2*m+m/2,yl+2*m+m/2);
			fflush(stdout);
			return 0;
		}
	}
	assert(false);
	return 0;
}

Compilation message (stderr)

aliens.cpp: In function 'int main()':
aliens.cpp:57:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   57 |    if(Ask(xl-2*m,y0)||(y>m&&Ask(x1-2*m,y0-m)||(y<=m&&y+m<=n&&Ask(x1-2*m,y0+m))))xl-=2*m;
      |                        ~~~^~~~~~~~~~~~~~~~~~
aliens.cpp:61:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   61 |    if(Ask(xr+2*m,y0)||(y>m&&Ask(xr+2*m,y0-m)||(y<=m&&y+m<=n&&Ask(xr+2*m,y0+m))))xr+=2*m;
      |                        ~~~^~~~~~~~~~~~~~~~~~
aliens.cpp:65:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   65 |    if(Ask(x0,yl-2*m)||(x>m&&Ask(x,yl-2*m)||(x<=m&&x+m<=n&&Ask(x,yl-2*m))))yl-=2*m;
      |                        ~~~^~~~~~~~~~~~~~~
aliens.cpp:69:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   69 |    if(Ask(x0,yr+2*m)||(x>m&&Ask(x,yr+2*m)||(x<=m&&x+m<=n&&Ask(x,yr+2*m))))yr+=2*m;
      |                        ~~~^~~~~~~~~~~~~~~
aliens.cpp: In function 'bool Ask(int, int)':
aliens.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |  scanf("%s",s);
      |  ~~~~~^~~~~~~~
aliens.cpp: In function 'int main()':
aliens.cpp:14:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  scanf("%d%d%d",&n,&x,&y);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 10 / 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