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Copy pathProblem A.cpp
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Copy pathProblem A.cpp
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136 lines (135 loc) · 3.5 KB
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#include<cstdio>
#include<cstring>
#include<queue>
#include<algorithm>
using namespace std;
#define INF 0x3f3f3f3f
int n,m;
int si,sj,sb,sg,ei,ej;
int map[30][30]; //0-G 1-B 2-T
int dist[30][30][6][21];
bool vis[30][30][6][21];
int di[4]={-1,0,1,0};
int dj[4]={0,1,0,-1};
int ki[8]={-2,-1,1,2,2,1,-1,-2};
int kj[8]={1,2,2,1,-1,-2,-2,-1};
int chk(int i,int j)
{
if(i>=0 && i<n && j>=0 && j<m)
return 1;
return 0;
}
struct heapnode
{
int i,j,b,g,t;
bool operator < (const heapnode& rhs) const
{
return t>rhs.t;
}
};
int dijsktra()
{
priority_queue <heapnode> q;
memset(dist,INF,sizeof(dist));
memset(vis,0,sizeof(vis));
dist[si][sj][sb][sg]=0;
q.push((heapnode){si,sj,sb,sg,0});
while(!q.empty())
{
heapnode x=q.top();q.pop();
int i=x.i,j=x.j,b=x.b,g=x.g,t=x.t;
if(vis[i][j][b][g])continue;
vis[i][j][b][g]=true;
if(i==ei && j==ej)
return t;
for(int k=0;k<4;k++)
{
int x=i+di[k];
int y=j+dj[k];
if(!chk(x,y))
continue;
if((map[i][j]==0 && map[x][y]==0) || (map[i][j]>0 && map[x][y]>0)) //Run
{
if(map[x][y]==2 && b>0 && dist[x][y][b-1][g]>t+3) //Titan
{
dist[x][y][b-1][g]=t+3;
q.push((heapnode){x,y,b-1,g,t+3});
}
else if(map[x][y]!=2 && dist[x][y][b][g]>t+3) //ground or building
{
dist[x][y][b][g]=t+3;
q.push((heapnode){x,y,b,g,t+3});
}
}
if(g>=2) //Jet
{
if(map[x][y]==2 && b>0 && dist[x][y][b-1][g-2]>t+1) //Titan
{
dist[x][y][b-1][g-2]=t+1;
q.push((heapnode){x,y,b-1,g-2,t+1});
}
else if(map[x][y]!=2 && dist[x][y][b][g-2]>t+1) //ground or building
{
dist[x][y][b][g-2]=t+1;
q.push((heapnode){x,y,b,g-2,t+1});
}
}
}
for(int k=0;k<8;k++) //Hook
{
int x=i+ki[k];
int y=j+kj[k];
if(!chk(x,y))
continue;
if(g>=1)
{
if(map[x][y]==2 && b>0 && dist[x][y][b-1][g-1]>t+2) //Titan
{
dist[x][y][b-1][g-1]=t+2;
q.push((heapnode){x,y,b-1,g-1,t+2});
}
else if(map[x][y]==1 && dist[x][y][b][g-1]>t+2) //building
{
dist[x][y][b][g-1]=t+2;
q.push((heapnode){x,y,b,g-1,t+2});
}
}
}
}
return -1;
}
int main()
{
char c;
while(~scanf("%d%d",&n,&m))
{
scanf("%d%d%d%d",&si,&sj,&sb,&sg);
si--,sj--;
for(int i=0;i<n;i++)
{
getchar();
for(int j=0;j<m;j++)
{
scanf("%c",&c);
if(c=='G')
map[i][j]=0;
else if(c=='B')
map[i][j]=1;
else if(c=='T')
map[i][j]=2;
else
{
map[i][j]=1;
ei=i;
ej=j;
}
}
}
int k=dijsktra();
if(k==-1)
printf("Eran!!\n");
else
printf("%d\n",k);
}
return 0;
}