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Submission #547836

# Submission time Handle Problem Language Result Execution time Memory
547836 2022-04-11T20:37:40 Z MilosMilutinovic Aliens (IOI07_aliens) C++14
100 / 100
 2 ms 284 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define y0 y1231
#define y1 y132131
int n,x,y,x0,y0,x1,y1,x2,y2,x3,y3;
bool Ask(int X,int Y){
	//assert(1<=X&&X<=n&&1<=Y&&Y<=n);
	printf("examine %lld %lld\n",X,Y);
	fflush(stdout);
	char s[6];
	scanf("%s",s);
	return s[0]=='t';
}
signed main(){
	scanf("%lld%lld%lld",&n,&x,&y);
	{
		int low=0,high=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;
		}
		x0=x-ans,y0=y;
	}
	{
		int low=0,high=n-x,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,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/m!=1&&ly/m!=3&&ly/m!=5))continue;
		if(m%2==0)continue;
		int xl=x0,xr=x1,yl=y2,yr=y3;
		while(xl>m){
			if(Ask(xl-m,y)||((y>m&&Ask(xl-m,y-m))||(y+m<=n&&Ask(xl-m,y+m))))xl-=m;
			else break;
		}
		while(xr+m<=n){
			if(Ask(xr+m,y)||((y>m&&Ask(xr+m,y-m))||(y+m<=n&&Ask(xr+m,y+m))))xr+=m;
			else break;
		}
		while(yl>m){
			if(Ask(x,yl-m)||((x>m&&Ask(x-m,yl-m))||(x+m<=n&&Ask(x+m,yl-m))))yl-=m;
			else break;
		}
		while(yr+m<=n){
			if(Ask(x,yr+m)||((x>m&&Ask(x-m,yr+m))||(x+m<=n&&Ask(x+m,yr+m))))yr+=m;
			else break;
		}
		int tx=xr-xl+1,ty=yr-yl+1;
		if(tx==5*m&&ty==5*m){
			printf("solution %lld %lld",(xl+xr)/2,(yl+yr)/2);
			fflush(stdout);
			return 0;
		}
	}
	//assert(false);
	return 0;
}

Compilation message

aliens.cpp: In function 'bool Ask(long long int, long long int)':
aliens.cpp:12:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf("%s",s);
      |  ~~~~~^~~~~~~~
aliens.cpp: In function 'int main()':
aliens.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |  scanf("%lld%lld%lld",&n,&x,&y);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 284 KB Output is correct
2 Correct 1 ms 208 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 1 ms 208 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 1 ms 208 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB Output is correct
2 Correct 2 ms 208 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 1 ms 208 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 2 ms 208 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 1 ms 208 KB Output is correct
3 Correct 1 ms 208 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 208 KB Output is correct
2 Correct 2 ms 208 KB Output is correct
3 Correct 1 ms 208 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 1 ms 208 KB Output is correct
3 Correct 1 ms 208 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 208 KB Output is correct
2 Correct 1 ms 208 KB Output is correct
3 Correct 1 ms 208 KB Output is correct