This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <stdio.h>
#include <queue>
#define INF 0x7fffffff
using namespace std;
queue <int> Q;
int R, C, Sy, Sx, Cy, Cx, A[1001][1001], B[1001][1001], D[1001][1001];
int Dy[4]={0,1,0,-1}, Dx[4]={1,0,-1,0};
int Left[1001][1001], Right[1001][1001], Up[1001][1001], Down[1001][1001];
void input(void)
{
int i, j, x;
char temp[1002];
scanf("%d %d",&R,&C);
for(i=1 ; i<=R ; i++)
{
scanf("%s",&temp[1]);
for(j=1 ; j<=C ; j++)
{
if(temp[j]=='#')
A[i][j]=1;
else if(temp[j]=='S')
{
Sy=i;
Sx=j;
}
else if(temp[j]=='C')
{
Cy=i;
Cx=j;
}
B[i][j]=D[i][j]=INF;
}
}
for(i=1 ; i<=R ; i++)
{
x=0;
for(j=1 ; j<=C ; j++)
{
if(A[i][j])
x=0;
else
{
if(!x)
x=j;
Left[i][j]=x;
}
}
x=0;
for(j=C ; j>=1 ; j--)
{
if(A[i][j])
x=0;
else
{
if(!x)
x=j;
Right[i][j]=x;
}
}
}
for(i=1 ; i<=C ; i++)
{
x=0;
for(j=1 ; j<=R ; j++)
{
if(A[j][i])
x=0;
else
{
if(!x)
x=j;
Up[i][j]=x;
}
}
x=0;
for(j=R ; j>=1 ; j--)
{
if(A[i][j])
x=0;
else
{
if(!x)
x=j;
Down[i][j]=x;
}
}
}
}
void process(void)
{
int i, j, y, x, ty, tx;
for(i=1 ; i<=R ; i++)
for(j=1 ; j<=C ; j++)
if(A[i][j])
{
B[i][j]=0;
Q.push(i);
Q.push(j);
}
while(!Q.empty())
{
y=Q.front();
Q.pop();
x=Q.front();
Q.pop();
for(i=0 ; i<=3 ; i++)
{
ty=y+Dy[i];
tx=x+Dx[i];
if(ty>=1 && ty<=R && tx>=1 && tx<=C)
if(B[ty][tx]>B[y][x]+1)
{
B[ty][tx]=B[y][x]+1;
Q.push(ty);
Q.push(tx);
}
}
}
D[Sy][Sx]=0;
Q.push(Sy);
Q.push(Sx);
while(!Q.empty())
{
y=Q.front();
Q.pop();
x=Q.front();
Q.pop();
for(i=0 ; i<=3 ; i++)
{
ty=y+Dy[i];
tx=x+Dx[i];
if(ty>=1 && ty<=R && tx>=1 && tx<=C && !A[ty][tx])
if(D[ty][tx]>D[y][x]+1)
{
D[ty][tx]=D[y][x]+1;
Q.push(ty);
Q.push(tx);
}
}
ty=y;
tx=Left[y][x];
if(D[ty][tx]>D[y][x]+B[y][x])
{
D[ty][tx]=D[y][x]+B[y][x];
Q.push(ty);
Q.push(tx);
}
ty=y;
tx=Right[y][x];
if(D[ty][tx]>D[y][x]+B[y][x])
{
D[ty][tx]=D[y][x]+B[y][x];
Q.push(ty);
Q.push(tx);
}
ty=Up[y][x];
tx=x;
if(D[ty][tx]>D[y][x]+B[y][x])
{
D[ty][tx]=D[y][x]+B[y][x];
Q.push(ty);
Q.push(tx);
}
ty=Down[y][x];
tx=x;
if(D[ty][tx]>D[y][x]+B[y][x])
{
D[ty][tx]=D[y][x]+B[y][x];
Q.push(ty);
Q.push(tx);
}
}
}
void output(void)
{
printf("%d",D[Cy][Cx]);
}
int main(void)
{
input();
process();
output();
return 0;
}
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