Submission #1048765

#	Time	Username	Problem	Language	Result	Execution time	Memory
1048765		adiyer	Robots (APIO13_robots)	C++17	0 / 100	10 ms	72280 KiB

robots

// #pragma optimize ("g",on)
// #pragma GCC optimize("inline")
// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC optimize ("03")
// #pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")

#include <bits/stdc++.h>

#define file(s) freopen(s".in", "r", stdin); freopen(s".out", "w", stdout);
#define adiyer(); ios_base::sync_with_stdio(0); cin.tie(0);
#define bitcount(n) __builtin_popcountll(n)
#define puts(x) (x ? "YES\n" : "NO\n");
#define ent (i == n ? '\n' : ' ')
#define all(x) x.begin(), x.end()
#define md ((l + r) >> 1)
#define rv(v) ((v << 1) | 1)
#define lv(v) (v << 1)
#define rs(v) rv(v), md + 1, r
#define ls(v) lv(v), l, md
#define len(s) (int) s.size()

#define pb push_back
#define S second
#define F first

// #define int long long

using namespace std;

typedef long long ll;
typedef long double ld;
typedef vector < ll > vll;
typedef pair < ll, ll > pll;
typedef vector < pair < ll, ll > > vpll;

const int dx[8] = {1, 0, -1, 0, 1, 1, -1, -1};
const int dy[8] = {0, 1, 0, -1, -1, 1, -1, 1};
const int N = 5e2 + 23;
const int K = 2e5;
const int mod = 998244353;
const ll inf = 1e9 + 10;

//mt19937 rnd(07062006);

ll k, n, m, res, cur, cnt;	
ll d[10][N][N], ans[10][10][N][N];

pll was[N][N][2][2][2][2];

char a[N][N];

bool good(ll x, ll y){
	return x >= 1 && y >= 1 && x <= n && y <= m && a[x][y] != 'x';
}

void move(ll &x, ll &y, ll d1, ll d2, ll d3, ll d4){
	ll X = x, Y = y;
	vector < vll > v;
	v.pb({x, y, d1, d2, d3, d4});
	while(1){
		// cout << x << ' ' << y << '\n';
		if(a[x][y] == 'C'){
			if(d1) d1 = 0, d2 = 1;
			else if(d2) d2 = 0, d3 = 1;
			else if(d3) d3 = 0, d4 = 1;
			else d4 = 0, d1 = 1;
		}
		if(a[x][y] == 'A'){
			if(d1) d1 = 0, d4 = 1;
			else if(d2) d2 = 0, d1 = 1;
			else if(d3) d3 = 0, d2 = 1;
			else d4 = 0, d3 = 1;
		}
		if(d1) y++;
		else if(d2) x++;
		else if(d3) y--;
		else x--;
		if(!good(x, y)) break;
		v.pb({x, y, d1, d2, d3, d4});
	}
	x = v[len(v) - 1][0], y = v[len(v) - 1][1];
	if(!was[v[len(v) - 1][0]][v[len(v) - 1][1]][v[len(v) - 1][2]][v[len(v) - 1][3]][v[len(v) - 1][4]][v[len(v) - 1][5]].F){
		was[v[len(v) - 1][0]][v[len(v) - 1][1]][v[len(v) - 1][2]][v[len(v) - 1][3]][v[len(v) - 1][4]][v[len(v) - 1][5]] = {x, y};
	}
	for(auto it : v) was[it[0]][it[1]][it[2]][it[3]][it[4]][it[5]] = was[v[len(v) - 1][0]][v[len(v) - 1][1]][v[len(v) - 1][2]][v[len(v) - 1][3]][v[len(v) - 1][4]][v[len(v) - 1][5]] = {x, y};
	// for(auto it : v) cout << it[0] << ' ' << it[1] << '\n';
	// cout << x << ' ' << y << ' ' << d[1][x][y] << '\n';
}

void bfs(pll s, ll id){
	ll x, y;
	queue < pll > q;
	for(ll i = 1; i <= n; i++)
		for(ll j = 1; j <= m; j++)
			d[id][i][j] = inf;
	for(ll i = 1; i <= n; i++)
		for(ll j = 1; j <= m; j++)
			for(ll d1 = 0; d1 <= 1; d1++)
				for(ll d2 = 0; d2 <= 1; d2++)
					for(ll d3 = 0; d3 <= 1; d3++)
						for(ll d4 = 0; d4 <= 1; d4++)
							was[i][j][d1][d2][d3][d4] = {0, 0};
	q.push(s), d[id][s.F][s.S] = 0;
	while(len(q)){
		auto [X, Y] = q.front();
		q.pop();
		x = X, y = Y, move(x, y, 0, 0, 0, 1);
		if(good(x, y) && d[id][X][Y] + 1 < d[id][x][y]){
			d[id][x][y] = d[id][X][Y] + 1;
			q.push({x, y});
		}
		x = X, y = Y, move(x, y, 0, 0, 1, 0);
		if(good(x, y) && d[id][X][Y] + 1 < d[id][x][y]){
			d[id][x][y] = d[id][X][Y] + 1;
			q.push({x, y});
		}
		x = X, y = Y, move(x, y, 0, 1, 0, 0);
		if(good(x, y) && d[id][X][Y] + 1 < d[id][x][y]){
			d[id][x][y] = d[id][X][Y] + 1;
			q.push({x, y});
		}
		x = X, y = Y, move(x, y, 1, 0, 0, 0);
		if(good(x, y) && d[id][X][Y] + 1 < d[id][x][y]){
			d[id][x][y] = d[id][X][Y] + 1;
			q.push({x, y});
		}
	}
	// exit(0);
}

vll v;

vpll pos[N * N * 10];

vector < vll > vp = {{0, 0, 0, 1}, {0, 0, 1, 0}, {0, 1, 0, 0}, {1, 0, 0, 0}};

void output(){
	cin >> k >> m >> n, res = inf;
	for(ll i = 1; i <= n; i++)
		for(ll j = 1; j <= m; j++)
			cin >> a[i][j];
	for(ll i = 1; i <= n; i++)
		for(ll j = 1; j <= m; j++)
			if('1' <= a[i][j] && a[i][j] <= '9')
				bfs({i, j}, a[i][j] - '0');
	queue < pll > q;
	for(ll sz = 1; sz <= k; sz++){
		for(ll l = 1; l + sz - 1 <= n; l++){
			ll r = l + sz - 1;
			pair < ll, pll > mn = {inf, {inf, inf}};
			for(ll i = 1; i <= n; i++){
				for(ll j = 1; j <= m; j++){
					if(sz == 1){
						ans[l][r][i][j] = d[l][i][j];
						continue;
					}
					ans[l][r][i][j] = inf;
					for(ll id = l; id < r; id++){
						ans[l][r][i][j] = min(ans[l][r][i][j], ans[l][id][i][j] + ans[id + 1][r][i][j]);
					}
					if(ans[l][r][i][j] < inf){
						v.pb(ans[l][r][i][j]);
						pos[ans[l][r][i][j]].pb({i, j});
						mn = min(mn, {ans[l][r][i][j], {i, j}});
					}
				}
			}
			if(mn.F == inf) continue;
			for(auto x : pos[mn.F]) q.push(x);
			pos[mn.F].clear();
			while(len(q)){
				auto [x, y] = q.front();
				q.pop();
				ll cst = ans[l][r][x][y];
				if(pos[cst + 1].empty()){
					for(auto it : pos[cst + 1]){
						if(ans[l][r][it.F][it.S] <= cst) continue;
						q.push(it);
					}
				}
				for(auto it : vp){
					auto nxt = was[x][y][it[0]][it[1]][it[2]][it[3]];
					if(ans[l][r][nxt.F][nxt.S] <= cst) continue;
					ans[l][r][nxt.F][nxt.S] = cst + 1;
					q.push(nxt);
				}
				
			}
			for(auto it : v) pos[it].clear();
			v.clear();
		}
	}
	for(ll i = 1; i <= n; i++)
		for(ll j = 1; j <= m; j++)
			res = min(res, ans[1][k][i][j]);
	if(res == inf) res = -1;
	cout << res;
}

const bool cases = 0;

signed main(){
//  file("disrupt");
    adiyer();
    int tt = 1;
    if(cases) cin >> tt;
    for(int i = 1; i <= tt; i++){
    	output();
    }
}

Compilation message (stderr)

robots.cpp: In function 'void move(ll&, ll&, ll, ll, ll, ll)':
robots.cpp:58:5: warning: unused variable 'X' [-Wunused-variable]
   58 |  ll X = x, Y = y;
      |     ^
robots.cpp:58:12: warning: unused variable 'Y' [-Wunused-variable]
   58 |  ll X = x, Y = y;
      |            ^

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