Submission #1002037

#	Time	Username	Problem	Language	Result	Execution time	Memory
1002037		vjudge1	Robots (APIO13_robots)	C++17	10 / 100	1 ms	348 KiB

robots

//#pragma GCC optimize ("O3")
//#pragma GCC target ("sse4")

#include <bits/stdc++.h>

#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back	
#define pob pop_back
#define int long long
#define int2 __int128_t
#define Shrek_Crush228 ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define F first
#define S second
#define sz size()
#define FOR( i, x, n, d ) for( int i = x; i <= n; i += d )
#define FORR( i, x, n, d ) for( int i = x; i >= n; i -= d )
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define no cout << "NO\n"
#define yes cout << "YES\n"
#define nep next_permutation
#define sigma signed
#define pii pair <int, int> 

using namespace std;

string alp = "abcdefghijklmnopqrstuvwxyz";
string ae = "aoeiuy";
string nums = "123456789";

const int N = 3e5 + 123;
const int inf = 1e18;
const int MOD = 1e9 + 7;
const int MOD1 = 998244353;

int a[N], b[N], c[N], d[N], l, r, n, k, m, w, cur, cnt, res, sum, sum1, x, y, ans, ans1, mx = -inf, mn = inf, ind, ind1, pref[N], suf[N];
string s, s1;

struct RT
{
	int sum, l, r, ind;	
};
int gcd( int a, int b )
{
	return ( b ? gcd( b, a % b ) : a );
}
int lcm( int a, int b )
{
	return a / gcd( a, b ) * b;
}
int bp( int a, int b, int m )
{
	if( !b ) return 1;
	if( b & 1 ) return bp( a, b - 1, m ) * a % m;
	
	int it = bp( a, b >> 1, m );
	return it * it % m;
}
struct po
{
	int v1, v2, v3;
};
char maze[505][505];
int used[505][505];

pii to_left( int x, int y )
{
	if( maze[x][y - 1] == 'x' || y - 1 < 1 ) return { x, y };
	return to_left( x, y - 1 );
}
pii to_right( int x, int y )
{
	if( maze[x][y + 1] == 'x' || y + 1 > m ) return { x, y };
	return to_right( x, y + 1 );
}
pii to_up( int x, int y )
{
	if( maze[x - 1][y] == 'x' || x - 1 < 1 ) return { x, y };
	return to_up( x - 1, y );
}
pii to_down( int x, int y )
{
	if( maze[x + 1][y] == 'x' || x + 1 > n ) return { x, y };
	return to_down( x + 1, y );
}
void get( int xn, int yn, int xst, int yst, int dist )
{
	if( used[xn][yn] < dist ) return;
	if( xn == xst && yn == yst )
	{
		ans = min( ans, dist );
		return;
	}
	used[xn][yn] = dist;
	
	int xl, yl, xr, yr, xu, yu, xd, yd, okl = 0, okr = 0, oku = 0, okd = 0;
	
	tie( xl, yl ) = to_left( xn, yn );
	tie( xr, yr ) = to_right( xn, yn );
	tie( xu, yu ) = to_up( xn, yn );
	tie( xd, yd ) = to_down( xn, yn );
	
	get( xl, yl, xst, yst, dist + 1 );
	get( xr, yr, xst, yst, dist + 1 ); 
	get( xu, yu, xst, yst, dist + 1 );
	get( xd, yd, xst, yst, dist + 1 );
}
void clean()
{
	FOR( i, 0, n + 1, 1 )
	{
		FOR( j, 0, m + 1, 1 ) used[i][j] = inf;
	}
}
void solve()
{
	cin >> k >> n >> m;
	int x1, y1, x2, y2;	
	
	FOR( i, 1, n, 1 )
	{
		FOR( j, 1, m, 1 ) 
		{
			cin >> maze[i][j];
			if( maze[i][j] == '1' ) x1 = i, y1 = j;
			if( maze[i][j] == '2' ) x2 = i, y2 = j;
		}
	} 
	ans = 1e9;
	pii L = to_left( x2, y2 ), R = to_right( x2, y2 ), U = to_up( x2, y2 ), D = to_down( x2, y2 );
	
	clean();
	get( x1, y1, L.F, L.S, 1 );
	clean();
	get( x1, y1, R.F, R.S, 1 );
	clean();
	get( x1, y1, U.F, U.S, 1 );
	clean();
	get( x1, y1, D.F, D.S, 1 );
	clean();
	get( x1, y1, x2, y2, 0 );
	
	cout << ( ans == 1e9 ? -1 : ans );
}
sigma main() 
{
	//freopen("haircut.in", "r", stdin);
	//freopen("haircut.out", "w", stdout);
	
    Shrek_Crush228
    
    int test = 1;
    
    if( !test ) cin >> test;
	
	while( test -- )
	{
		solve();
	}
}
//// solved by KluydQ
/*
1.........
AA.x4.....
..A..x....
2....x....
..C.3.A...
*/

Compilation message (stderr)

robots.cpp: In function 'void get(long long int, long long int, long long int, long long int, long long int)':
robots.cpp:99:38: warning: unused variable 'okl' [-Wunused-variable]
   99 |  int xl, yl, xr, yr, xu, yu, xd, yd, okl = 0, okr = 0, oku = 0, okd = 0;
      |                                      ^~~
robots.cpp:99:47: warning: unused variable 'okr' [-Wunused-variable]
   99 |  int xl, yl, xr, yr, xu, yu, xd, yd, okl = 0, okr = 0, oku = 0, okd = 0;
      |                                               ^~~
robots.cpp:99:56: warning: unused variable 'oku' [-Wunused-variable]
   99 |  int xl, yl, xr, yr, xu, yu, xd, yd, okl = 0, okr = 0, oku = 0, okd = 0;
      |                                                        ^~~
robots.cpp:99:65: warning: unused variable 'okd' [-Wunused-variable]
   99 |  int xl, yl, xr, yr, xu, yu, xd, yd, okl = 0, okr = 0, oku = 0, okd = 0;
      |                                                                 ^~~
robots.cpp: In function 'void solve()':
robots.cpp:142:5: warning: 'y2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  142 |  get( x1, y1, D.F, D.S, 1 );
      |  ~~~^~~~~~~~~~~~~~~~~~~~~~~
robots.cpp:138:5: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  138 |  get( x1, y1, R.F, R.S, 1 );
      |  ~~~^~~~~~~~~~~~~~~~~~~~~~~
robots.cpp:142:5: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  142 |  get( x1, y1, D.F, D.S, 1 );
      |  ~~~^~~~~~~~~~~~~~~~~~~~~~~
robots.cpp:142:5: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized]

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