Submission #171959

#	Time	Username	Problem	Language	Result	Execution time	Memory
171959		dndhk	Worm Worries (BOI18_worm)	C++14	78 / 100	962 ms	6976 KiB

worm

#include <bits/stdc++.h>

#define all(v) (v).begin(), (v).end()
#define sortv(v) sort(all(v))
#define uniqv(v) (v).erase(unique(all(v)), (v).end())
#define pb push_back
#define FI first
#define SE second
#define lb lower_bound
#define ub upper_bound
#define test 1
#define TEST if(test)

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;

const int MOD = 1000000007; // 998244353
const int INF = 2e9;
const ll INFLL = 1e18;
const int MAX_N = 1;

int N, M, K, Q;
map<ll, int> mp;

int ask(int x, int y, int z){
	if(x<1 || x>N || y<1 || y>M || z<1 || z>K)	return 0;
	ll t = (ll)x*(ll)(M+1)*(ll)(K+1)+(ll)y*(ll)(K+1)+(ll)z;
	if(mp[t]!=0){
		return mp[t];
	}
	printf("? %d %d %d\n", x, y, z);
	int ret;
	fflush(stdout);
	scanf("%d", &ret);
	mp[t] = ret;
	return ret;
}

void ans(int x, int y, int z){
	printf("! %d %d %d\n", x, y, z);
	fflush(stdout);
}

void pro1(){
	int s = 0, e = N+1, m;
	int mx = 0;
	while(s<e){
		if(s==e-1){
			int t1 = ask(s, 1, 1), t2 = ask(e, 1, 1);
			if(t1>t2){
				ans(s, 1, 1);
			}else{
				ans(e, 1, 1);
			}
			return;
		}
		m = (s+e)/2;
		int h = ask(m, 1, 1);
		if(h>mx){
			int h2 = ask(m+1, 1, 1);
			if(h>h2){
				e = m;
				mx = h;
			}else{
				s = m+1;
				mx = h2;
			}
		}else{
			if(ask(s, 1, 1)<ask(e, 1, 1)){
				s = m;
			}else{
				e = m;
			}
		}
	}
	ans(s, 1, 1);
}

vector<pii> vt; 

void pro2(){
	pii s={1, 1}, e={N, M};
	pii mx = {0, 0};
	while(s.first!=e.first || s.second!=e.second){
		if(s.second!=e.second){
			while(!vt.empty())	vt.pop_back();
			int m = (s.second + e.second)/2;
			for(int i=s.first; i<=e.first; i++){
				vt.pb({ask(i, m, 1), i});
			}
			sort(vt.begin(), vt.end());
			if(vt.back().first>=ask(mx.first, mx.second, 1)){
				if(ask(vt.back().second, m-1, 1)>vt.back().first){
					mx.first = vt.back().second; mx.second = m-1;
					e.second = m-1;	
				}else if(ask(vt.back().second, m+1, 1)>vt.back().first){
					mx.first = vt.back().second; mx.second = m+1;
					s.second = m+1;
				}else{
					ans(vt.back().second, m, 1);
					return;
				}
			}else{
				if(mx.second<m){
					e.second = m-1;
				}else{
					s.second = m+1;
				}
			}
		}
		if(s.first!=e.first){
			while(!vt.empty())	vt.pop_back();
			int m = (s.first+e.first)/2;
			for(int i=s.second; i<=e.second; i++){
				vt.pb({ask(m, i, 1), i});
			}
			sort(vt.begin(), vt.end());
			if(vt.back().first>=ask(mx.first, mx.second, 1)){
				if(ask(m-1, vt.back().second, 1)>vt.back().first){
					mx.first = m-1; mx.second = vt.back().second;
					e.first = m-1;
				}else if(ask(m+1, vt.back().second, 1)>vt.back().first){
					mx.first = m+1; mx.second = vt.back().second;
					s.first = m+1;
				}else{
					ans(m, vt.back().second, 1);
					return;
				}
			}else{
				if(mx.first<m){
					e.first = m-1;
				}else{
					s.first = m+1;
				}
			}
		}
	}
	ans(s.first, s.second, 1);
}

struct Point{
	int x, y, z;
};

int dx[6] = {1, -1, 0, 0, 0, 0}, dy[6] = {0, 0, 1, -1, 0, 0}, dz[6] = {0, 0, 0, 0, 1, -1};

void pro3(){
	Point mx = {0, 0, 0};
	for(int i=0; i<Q/2; i++){
		int x, y, z;
		x = rand()%N+1; y = rand()%M+1; z = rand()%K+1;
		if(ask(x, y, z)>ask(mx.x, mx.y, mx.z)){
			mx.x = x; mx.y = y; mx.z = z;
		}
	}
	while(1){
		int m=0, t=0;
		for(int i=0; i<6; i++){
			int ret = ask(mx.x+dx[i], mx.y+dy[i], mx.z+dz[i]);
			if(ret>m){
				m = ret;
				t = i;
			}
		}
		if(m>ask(mx.x, mx.y, mx.z)){
			mx.x+=dx[t];
			mx.y+=dy[t];
			mx.z+=dz[t];
		}else{
			ans(mx.x, mx.y, mx.z);
			return;
		}
	}

}

int main(){
	scanf("%d%d%d%d", &N, &M, &K, &Q);
	if(M==1 && K==1 && N==1000000){
		pro1();
	}else if(K==1){
		pro2();
	}else{
		pro3();
	}
	return 0;
}

Compilation message (stderr)

worm.cpp: In function 'int ask(int, int, int)':
worm.cpp:38:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &ret);
  ~~~~~^~~~~~~~~~~~
worm.cpp: In function 'int main()':
worm.cpp:182:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d", &N, &M, &K, &Q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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