Submission #246956

#	Time	Username	Problem	Language	Result	Execution time	Memory
246956		dorijanlendvaj	Robots (APIO13_robots)	C++14	30 / 100	287 ms	115064 KiB

robots

//DUEL
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define x first
#define y second
#define pii pair<int,int>
#define pb push_back
#define eb emplace_back
#pragma GCC optimize("unroll-loops")
#define shandom_ruffle(a, b) shuffle(a, b, rng)
#define vi vector<int>
#define vl vector<ll>
#define popcnt __builtin_popcount
#define popcntll __builtin_popcountll
#define all(a) begin(a),end(a)

using namespace std;
using namespace __gnu_pbds;

using ll=long long;
using ull=unsigned long long;
using ld=long double;
int MOD=1000000007;
int MOD2=998244353;
vector<int> bases;
const ll LLINF=1ll<<60;
const char en='\n';

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void yes() {cout<<"YES"<<en; exit(0);}
void no() {cout<<"NO"<<en; exit(0);}
inline int rund() {int x576363482791fuweh=rng();return abs(x576363482791fuweh)%RAND_MAX;}
template<class T>
void prVec(vector<T> w,bool fl=false)
{
	cout<<w.size()<<en;
	for (int i=0;i<int(w.size())-1;++i) cout<<w[i]<<' ';
	if (w.size()) cout<<w[w.size()-1]<<en;
	if (fl) cout<<flush;
}

void M998()
{
	swap(MOD,MOD2);
}

ll raand()
{
	ll a=rund();
	a*=RAND_MAX;
	a+=rund();
    return a;
}

#define rand raand

ll raaand()
{
	return raand()*(MOD-7)+raand();
}

void compress(vi&v)
{
	set<int> s;
	for (auto a: v) s.insert(a);
	vi o(all(s));
	for (auto&a: v) a=lower_bound(all(o),a)-o.begin();
}

void compress(vl&v)
{
	set<ll> s;
	for (auto a: v) s.insert(a);
	vl o(all(s));
	for (auto&a: v) a=lower_bound(all(o),a)-o.begin();
}

string to_upper(string a)
{
	for (int i=0;i<(int)a.size();++i) if (a[i]>='a' && a[i]<='z') a[i]-='a'-'A';
	return a;
}

string to_lower(string a)
{
	for (int i=0;i<(int)a.size();++i) if (a[i]>='A' && a[i]<='Z') a[i]+='a'-'A';
	return a;
}

ll sti(string a,int base=10)
{
	ll k=0;
	for (int i=0;i<(int)a.size();++i)
	{
		k*=base;
		k+=a[i]-'0';
	}
	return k;
}

template<class T>
void eras(vector<T>& a,T b)
{
	a.erase(find(a.begin(),a.end(),b));
}

string its(ll k,int base=10)
{
	if (k==0) return "0";
	string a;
	while (k)
	{
		a.push_back((k%base)+'0');
		k/=base;
	}
	reverse(a.begin(),a.end());
	return a;
}

ll min(ll a,int b)
{
	if (a<b) return a;
	return b;
}

ll min(int a,ll b)
{
	if (a<b) return a;
	return b;
}

ll max(ll a,int b)
{
	if (a>b) return a;
	return b;
}

ll max(int a,ll b)
{
	if (a>b) return a;
	return b;
}

ll gcd(ll a,ll b)
{
	if (b==0) return a;
	return gcd(b,a%b);
}

ll lcm(ll a,ll b)
{
	return a/gcd(a,b)*b;
}

template<class T,class K>
pair<T,K> mp(T a,K b)
{
	return make_pair(a,b);
}

inline int mult(ll a,ll b)
{
	return (a*b)%MOD;
}

inline int pot(int n,int k)
{
	if (k==0) return 1;
	ll a=pot(n,k/2);
	a=mult(a,a);
	if (k%2) return mult(a,n);
	else return a;
}

int divide(int a,int b)
{
	return mult(a,pot(b,MOD-2));
}

inline int sub(int a,int b)
{
	if (a-b>=0) return a-b;
	return a-b+MOD;
}

inline int add(int a,int b)
{
	if (a+b>=MOD) return a+b-MOD;
	return a+b;
}

bool prime(ll a)
{
	if (a==1) return 0;
	for (int i=2;i<=round(sqrt(a));++i)
	{
		if (a%i==0) return 0;
	}
	return 1;
}

const int N=510;
int k,n,m;
string h[N];
int dis[10][10][N][N];
vector<pii> ch[N][N],im[N*N*9];
bool bio[N][N][4],bi[N][N];
pii re[N][N][4];
int dx[]={0,1,0,-1};
int dy[]={1,0,-1,0}; //clockwise

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	for (int i=0;i<10;++i) bases.push_back(rand()%(MOD-13893829*2)[phone]);
	cin>>k>>m>>n;
	for (int i=0;i<n;++i) cin>>h[i];
	for (int i=0;i<n;++i) for (int j=0;j<m;++j) for (int z=0;z<4;++z) if (!(bio[i][j][z] || h[i][j]=='x'))
	{
		int i1=i,j1=j,z1=z;
		pair<pii,int> pre;
		vector<pair<pii,int>> pro;
		while (1)
		{
			if (i1<0 || j1<0 || i1>=n || j1>=m || bio[i1][j1][z1] || h[i1][j1]=='x')
			{
				pii uf=pre.x;
				if (i1>=0 && j1>=0 && i1<n && j1<m && bio[i1][j1][z1]) uf=re[i1][j1][z1];
				//cout<<i<<' '<<j<<' '<<i1<<' '<<j1<<' '<<z<<' '<<uf.x<<' '<<uf.y<<en;
				for (auto a: pro)
				{
					if (uf!=mp(a.x.x,a.x.y)) ch[a.x.x][a.x.y].pb(uf);
					bio[a.x.x][a.x.y][a.y]=1;
					re[a.x.x][a.x.y][a.y]=uf;
				}
				break;
			}
			pre={{i1,j1},z1};
			pro.pb(pre);
			if (h[i1][j1]=='C') z1=(z1+1)%4;
			if (h[i1][j1]=='A') z1=(z1+3)%4;
			i1+=dx[z1];
			j1+=dy[z1];
		}
	}
	/*for (int i=0;i<n;++i) for (int j=0;j<m;++j)
	{
		cout<<i<<' '<<j<<':'<<en;
		for (auto a: ch[i][j]) cout<<a.x<<' '<<a.y<<en;
	}*/
	for (int i=0;i<n;++i) for (int j=0;j<m;++j) if (h[i][j]>='0' && h[i][j]<='9')
	{
		memset(bi,0,sizeof(bi));
		int z=h[i][j]-'0';
		queue<pair<pii,int>> q;
		q.push({{i,j},0});
		memset(dis[z][z],1,sizeof(dis[z][z]));
		while (q.size())
		{
			int i1=q.front().x.x,j1=q.front().x.y,d=q.front().y;
			q.pop();
			if (bi[i1][j1]) continue;
			bi[i1][j1]=1;
			dis[z][z][i1][j1]=d;
			for (auto a: ch[i1][j1]) q.push({a,d+1});
		}
	}
	for (int le=1;le<k;++le) for (int s=1;s<=k-le;++s)
	{
		int t=s+le;
		memset(dis[s][t],1,sizeof(dis[s][t]));
		for (int i=0;i<n;++i) for (int j=0;j<m;++j) for (int z=s;z<t;++z) dis[s][t][i][j]=min(dis[s][t][i][j],dis[s][z][i][j]+dis[z+1][t][i][j]);
		for (int i=0;i<k*n*m;++i) im[i].clear();
		memset(bi,0,sizeof(bi));
		for (int i=0;i<n;++i) for (int j=0;j<m;++j) if (dis[s][t][i][j]<20*(n+m)) im[dis[s][t][i][j]].eb(i,j);
		for (int di=0;di<k*n*m;++di)
		{
			for (auto a: im[di])
			{
				int i=a.x,j=a.y;
				if (bi[i][j]) continue;
				bi[i][j]=1;
				dis[s][t][i][j]=di;
				for (auto b: ch[i][j]) im[di+1].pb(b);
			}
		}
	}
	/*for (int s=1;s<=k;++s) for (int t=s;t<=k;++t)
	{
		cout<<s<<' '<<t<<en;
		for (int i=0;i<n;++i,cout<<en) for (int j=0;j<m;++j) cout<<dis[s][t][i][j]<<' ';
	}*/
	int mi=MOD;
	for (int i=0;i<n;++i) for (int j=0;j<m;++j) mi=min(mi,dis[1][k][i][j]);
	if (mi<k*n*m) cout<<mi<<en;
	else cout<<-1<<en;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40