Submission #266459

#	Time	Username	Problem	Language	Result	Execution time	Memory
266459		TadijaSebez	Worm Worries (BOI18_worm)	C++11	78 / 100	839 ms	5648 KiB

worm

#include <bits/stdc++.h>
using namespace std;
map<array<int,3>,int> was;
int n,m,k,q;
int Ask(int i,int j,int k){
	if(was.count({i,j,k}))return was[{i,j,k}];
	if(i<1||j<1||k<1||i>n||j>m||k>::k)return 0;
	printf("? %i %i %i\n",i,j,k);
	fflush(stdout);
	int b;scanf("%i",&b);
	was[{i,j,k}]=b;
	return b;
}
void Ans(int i,int j,int k){
	printf("! %i %i %i\n",i,j,k);
	fflush(stdout);
	exit(0);
}
bool Check(int i,int j,int k){
	int now=Ask(i,j,k);
	for(int a=-1;a<=1;a+=2)
		if(now<max({Ask(i+a,j,k),Ask(i,j+a,k),Ask(i,j,k+a)}))
			return 0;
	Ans(i,j,k);
	return 1;
}
mt19937 rng(time(0));
int main(){
	scanf("%i %i %i %i",&n,&m,&k,&q);
	if(m==1&&k==1){
		int top=n,bot=1,mid,las=0;
		while(top>bot){
			mid=top+bot>>1;
			if(las&&top-bot>1){
				if(las>mid&&Ask(mid,1,1)<Ask(las,1,1)){bot=mid;continue;}
				if(las<mid&&Ask(mid,1,1)<Ask(las,1,1)){top=mid;continue;}
			}
			if(Ask(mid,1,1)<Ask(mid+1,1,1))bot=mid+1,las=mid+1;
			else top=mid,las=mid;
		}
		Ans(bot,1,1);
	}else if(k==1){
		int X1=1,X2=n,Y1=1,Y2=m,Xm,Ym,last=0;
		pair<int,int> pre;
		while(X1<=X2&&Y1<=Y2){
			Xm=X1+X2>>1;
			int mx=0,pos=0;
			for(int i=Y1;i<=Y2;i++){
				int now=Ask(Xm,i,1);
				if(now>mx)mx=now,pos=i;
			}
			if(mx<last){
				if(Xm-1>=pre.first)X2=Xm-1;
				else X1=Xm+1;
			}else{
				if(Ask(Xm-1,pos,1)>mx){
					X2=Xm-1;
					pre={Xm-1,pos};
				}else if(Ask(Xm+1,pos,1)>mx){
					X1=Xm+1;
					pre={Xm+1,pos};
				}else Ans(Xm,pos,1);
				last=mx;
			}
			Ym=Y1+Y2>>1;
			mx=0,pos=0;
			for(int i=X1;i<=X2;i++){
				int now=Ask(i,Ym,1);
				if(now>mx)mx=now,pos=i;
			}
			if(mx<last){
				if(Ym-1>=pre.second)Y2=Ym-1;
				else Y1=Ym+1;
			}else{
				if(Ask(pos,Ym-1,1)>mx){
					Y2=Ym-1;
					pre={pos,Ym-1};
				}else if(Ask(pos,Ym+1,1)>mx){
					Y1=Ym+1;
					pre={pos,Ym+1};
				}else Ans(pos,Ym,1);
				last=mx;
			}
		}
	}else{
		int X,Y,Z,mx=0;
		for(int i=1;i<=q/2;i++){
			int x=rng()%n+1;
			int y=rng()%m+1;
			int z=rng()%k+1;
			if(Ask(x,y,z)>mx){
				mx=Ask(x,y,z);
				X=x;
				Y=y;
				Z=z;
			}
		}
		while(!Check(X,Y,Z)){
			if(Ask(X+1,Y,Z)>Ask(X,Y,Z))X++;
			else if(Ask(X-1,Y,Z)>Ask(X,Y,Z))X--;
			else if(Ask(X,Y+1,Z)>Ask(X,Y,Z))Y++;
			else if(Ask(X,Y-1,Z)>Ask(X,Y,Z))Y--;
			else if(Ask(X,Y,Z+1)>Ask(X,Y,Z))Z++;
			else if(Ask(X,Y,Z-1)>Ask(X,Y,Z))Z--;
		}
	}
	return 0;
}

Compilation message (stderr)

worm.cpp: In function 'int main()':
worm.cpp:33:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   33 |    mid=top+bot>>1;
      |        ~~~^~~~
worm.cpp:46:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |    Xm=X1+X2>>1;
      |       ~~^~~
worm.cpp:65:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   65 |    Ym=Y1+Y2>>1;
      |       ~~^~~
worm.cpp: In function 'int Ask(int, int, int)':
worm.cpp:10:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |  int b;scanf("%i",&b);
      |        ~~~~~^~~~~~~~~
worm.cpp: In function 'int main()':
worm.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |  scanf("%i %i %i %i",&n,&m,&k,&q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
worm.cpp:104:28: warning: 'Z' may be used uninitialized in this function [-Wmaybe-uninitialized]
  104 |    else if(Ask(X,Y,Z-1)>Ask(X,Y,Z))Z--;
      |                         ~~~^~~~~~~
worm.cpp:104:28: warning: 'Y' may be used uninitialized in this function [-Wmaybe-uninitialized]
worm.cpp:104:28: warning: 'X' may be used uninitialized in this function [-Wmaybe-uninitialized]

• Subtask 1: 10 / 10
• Subtask 2: 0 / 22
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 14 / 14
• Subtask 6: 23 / 23