Submission #986182

#	Time	Username	Problem	Language	Result	Execution time	Memory
986182		ByeWorld	Worm Worries (BOI18_worm)	C++14	32 / 100	3068 ms	7024 KiB

worm

#include <bits/stdc++.h>
#define ll long long
#define int long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,int> ipii;

vector <int> vx = {1, -1, 0, 0, 0, 0};
vector <int> vy = {0, 0, 1, -1, 0, 0};
vector <int> vz = {0, 0, 0, 0, 1, -1};

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int all, n, m, k, q;
int ansx=-1, ansy, ansz;
map <ipii, int> ma;
int num(int r){
	int x = rng(); x = abs(x);
	x %= r; x++;
	return x;
}

int que(int a, int b, int c){
	if(a<=0 || a>n || b<=0 || b>m || c<=0 || c>k) return 0;
	if(ma.count(ipii(pii(a, b), c)) != 0) return ma[ipii(pii(a, b), c)];
	if(all == q) assert(false);
	cout << "? " << a << ' ' << b << ' ' << c << endl;
	all++;
	int x; cin >> x; 
	ma[ipii(pii(a, b), c)] = x;
	return x;
}
bool aman(int a, int b, int c){
	if(a<=0 || a>n || b<=0 || b>m || c<=0 || c>k) return 0;
	for(int i=0; i<6; i++){
		if(que(a, b, c) < que(a+vx[i], b+vy[i], c+vz[i])) return 0;
	}
	return 1;
}

signed main(){
	cin >> n >> m >> k >> q; 
	if(m==1 && k==1){
		int len = n;
		int l=1, r=n, mid1=-1, mid2=-1;
		while(r-l+1 >= 4){
			len = r-l+1;
			if(mid1==-1) mid1 = l+0.382*len;
			if(mid2==-1) mid2 = l+0.618*len;
			if(mid1 >= mid2){
				mid1 = l+0.382*len;
				mid2 = l+0.618*len;
				if(mid1 >= mid2) break;
			}

			if(que(mid1, 1, 1) <= que(mid2, 1, 1)){
				l = mid1; mid1 = mid2; mid2 = -1;
			} else {
				r = mid2; mid2 = mid1; mid1 = -1;
			}
		}
		int ans = l;
		for(int i=l; i<=r; i++){
			if(que(i, 1, 1) >= max(que(i+1, 1, 1), que(i-1, 1, 1))){
				ans = i; break;
			}
		}
		// assert(ans != -1);
		cout << "! " << ans << " 1 1" << endl;
		exit(0);
	}
	if(m==1){
		exit(0);
	}
	int mx = -1, a=-1, b=-1, c=-1;
	for(int i=0; i<q/2; i++){
		int x=num(n), y=num(m), z=num(k);
		if(mx < que(x,y,z)){
			mx=que(x,y,z); a=x; b=y; c=z;
		}
	}
	while(all+6<q){
		if(aman(a, b, c)) break;
		int mx = -1, x=-1,y=-1,z=-1;
		for(int i=0; i<6; i++){
			if(mx < que(a+vx[i], b+vy[i], c+vz[i])){
				mx=que(a+vx[i], b+vy[i], c+vz[i]);
				x=a+vx[i]; y=b+vy[i]; z=c+vz[i];
			}
		}
	}
	cout << "! " <<a<<' '<<b<<' '<<c<<endl;
}

Compilation message (stderr)

worm.cpp: In function 'int main()':
worm.cpp:90:16: warning: variable 'x' set but not used [-Wunused-but-set-variable]
   90 |   int mx = -1, x=-1,y=-1,z=-1;
      |                ^
worm.cpp:90:21: warning: variable 'y' set but not used [-Wunused-but-set-variable]
   90 |   int mx = -1, x=-1,y=-1,z=-1;
      |                     ^
worm.cpp:90:26: warning: variable 'z' set but not used [-Wunused-but-set-variable]
   90 |   int mx = -1, x=-1,y=-1,z=-1;
      |                          ^

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