Submission #742423

#	Time	Username	Problem	Language	Result	Execution time	Memory
742423		jamezzz	Worm Worries (BOI18_worm)	C++17	59 / 100	915 ms	5616 KiB

worm

#include <bits/stdc++.h>
using namespace std;

#define sf scanf
#define pf printf

int n,m,k,q,dx[]={1,0,0,-1,0,0},dy[]={0,1,0,0,-1,0},dz[]={0,0,1,0,0,-1};
map<tuple<int,int,int>,int> memo;
mt19937 rng(time(0));

int ask(int a,int b,int c){
	if(memo.find({a,b,c})!=memo.end())return memo[{a,b,c}];
	pf("? %d %d %d\n",a,b,c);
	fflush(stdout);
	int x;sf("%d",&x);
	return memo[{a,b,c}]=x;
}

void submit(int a,int b,int c){
	pf("! %d %d %d\n",a,b,c);
	fflush(stdout);
	exit(0);
}

int bad(int a,int b,int c){
	return a<=0||b<=0||c<=0||a>n||b>m||c>k;
}

int main(){
	sf("%d%d%d%d",&n,&m,&k,&q);
	int Q=q;
	tuple<int,int,int,int> ans={0,0,0,0};
	for(int i=0;i<Q/2;++i){
		int x=rng()%n+1,y=rng()%m+1,z=rng()%k+1;
		ans=max(ans,{ask(x,y,z),x,y,z});
	}
	auto[cur,x,y,z]=ans;
	while(q){
		bool done=true;
		for(int i=0;i<6;++i){
			int nx=x+dx[i],ny=y+dy[i],nz=z+dz[i];
			if(bad(nx,ny,nz))continue;
			int res=ask(nx,ny,nz);
			if(res>cur){
				cur=res,x=nx,y=ny,z=nz;
				done=false;
				break;
			}
		}
		if(done)break;
	}
	submit(x,y,z);
}

Compilation message (stderr)

worm.cpp: In function 'int ask(int, int, int)':
worm.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  int x;sf("%d",&x);
      |          ^
worm.cpp: In function 'int main()':
worm.cpp:30:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |  sf("%d%d%d%d",&n,&m,&k,&q);
      |    ^

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