#include<cstdio>
#include<cstdlib>
#include<iostream>
#include<vector>
#include<queue>
#include<bitset>
#include<string>
#include<stack>
#include<set>
#include<unordered_set>
#include<map>
#include<unordered_map>
#include<cstring>
#include<complex>
#include<cmath>
#include<iomanip>
#include<numeric>
#include<algorithm>
#include<list>
#include<functional>
#include<cassert>
#define mp make_pair
#define pb push_back
#define X first
#define Y second
#define y0 y12
#define y1 y22
#define INF 987654321
#define PI 3.141592653589793238462643383279502884
#define fup(i,a,b,c) for(int (i)=(a);(i)<=(b);(i)+=(c))
#define fdn(i,a,b,c) for(int (i)=(a);(i)>=(b);(i)-=(c))
#define MEM0(a) memset((a),0,sizeof(a));
#define MEM_1(a) memset((a),-1,sizeof(a));
#define ALL(a) a.begin(),a.end()
#define SYNC ios_base::sync_with_stdio(false);cin.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef double db;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> Pi;
typedef pair<ll, ll> Pll;
typedef pair<ld, ld> Pd;
typedef vector<int> Vi;
typedef vector<ll> Vll;
typedef vector<double> Vd;
typedef vector<Pi> VPi;
typedef vector<Pll> VPll;
typedef vector<Pd> VPd;
typedef tuple<int, int, int> iii;
typedef tuple<int,int,int,int> iiii;
typedef tuple<ll, ll, ll> LLL;
typedef vector<iii> Viii;
typedef vector<LLL> VLLL;
typedef complex<double> base;
const ll MOD = 1000000007;
ll POW(ll a, ll b, ll MMM = MOD) {ll ret=1; for(;b;b>>=1,a=(a*a)%MMM)if(b&1)ret=(ret*a)% MMM; return ret; }
ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
ll lcm(ll a, ll b) { if (a == 0 || b == 0)return a + b; return a*(b / gcd(a, b)); }
int dx[] = { 0,1,0,-1,1,1,-1,-1 }, dy[] = { 1,0,-1,0,1,-1,1,-1 };
int n,m;
char s[1000][1002];
inline int z(int x,int y){return x*m+y;}
VPi v[1000000];
int dist[1000000];
bool chk[1000000];
int main() {
fill(dist,dist+1000000,INF);
scanf("%d%d",&n,&m);
fup(i,0,n-1,1)scanf("%s",s[i]);
int x1,y1,x2,y2;
scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
x1--,y1--,x2--,y2--;
fup(x,1,n-2,1)
{
fup(y,1,m-2,1)
{
fup(i,0,3,1)
{
int nx=x+dx[i],ny=y+dy[i];
if(nx>=0 && nx<n && ny>=0 && ny<m && s[nx][ny]=='.')v[z(x,y)].pb(mp(z(nx,ny),2));
}
}
}
fup(i,1,n-2,1)
{
int t=0;
fup(j,1,m-2,1)
{
if(s[i][j]=='#')t=j;
else
{
v[z(i,j)].pb(mp(z(i,t+1),1));
}
}
t=m-1;
fdn(j,m-2,1,1)
{
if(s[i][j]=='#')t=j;
else
{
v[z(i,j)].pb(mp(z(i,t-1),1));
}
}
}
fup(j,1,m-2,1)
{
int t=0;
fup(i,1,n-2,1)
{
if(s[i][j]=='#')t=i;
else
{
v[z(i,j)].pb(mp(z(t+1,j),1));
}
}
t=n-1;
fdn(i,n-2,1,1)
{
if(s[i][j]=='#')t=j;
else
{
v[z(i,j)].pb(mp(z(t-1,j),1));
}
}
}
priority_queue<Pi> q;
dist[z(x1,y1)] = 0;
q.push({ 0,z(x1,y1) });
while (!q.empty())
{
int x = q.top().Y;
q.pop();
if (chk[x])continue;
chk[x] = 1;
for (const auto& p : v[x])
{
int next = p.X, cost = p.Y;
if (dist[next] > dist[x]+cost)
{
dist[next] = dist[x] + cost;
q.push({ -dist[next],next });
}
}
}
int ans=dist[z(x2,y2)];
if(ans==INF)ans=-1;
printf("%d",ans);
}
Compilation message
skating.cpp: In function 'int main()':
skating.cpp:71:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&m);
~~~~~^~~~~~~~~~~~~~
skating.cpp:72:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
fup(i,0,n-1,1)scanf("%s",s[i]);
~~~~~^~~~~~~~~~~
skating.cpp:74:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
28 ms |
27896 KB |
Output is correct |
| 2 |
Correct |
28 ms |
27768 KB |
Output is correct |
| 3 |
Incorrect |
27 ms |
27768 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
28 ms |
27896 KB |
Output is correct |
| 2 |
Correct |
28 ms |
27768 KB |
Output is correct |
| 3 |
Incorrect |
27 ms |
27768 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
28 ms |
27896 KB |
Output is correct |
| 2 |
Correct |
28 ms |
27768 KB |
Output is correct |
| 3 |
Incorrect |
27 ms |
27768 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
