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 <bits/stdc++.h>
using namespace std;
const int mxN=9, mxS=500, mxD=mxS*mxS*mxN/2;
int n, w, h, di[4]={-1, 0, 1, 0}, dj[4]={0, 1, 0, -1}, d[mxN*(mxN+1)/2][mxS][mxS], ans=INT_MAX, m1[mxN][mxN];
string g[mxS];
array<int, 2> e[mxS][mxS][4], m2[mxN*(mxN+1)/2];
vector<array<int, 2>> bd[mxD];
array<int, 2> dfs(int i, int j, int k) {
if(e[i][j][k][0]==-1) {
e[i][j][k][0]=-2;
int nk=k;
if(g[i][j]=='C')
nk=(k+1)%4;
else if(g[i][j]=='A')
nk=(k+3)%4;
int ni=i+di[nk], nj=j+dj[nk];
e[i][j][k]=ni<0||ni>=h||nj<0||nj>=w||g[ni][nj]=='x'?array<int, 2>{i, j}:dfs(ni, nj, nk);
}
return e[i][j][k];
}
void ud(int d[mxS][mxS], int i, int j, int k) {
if(k<mxD&&d[i][j]>k) {
d[i][j]=k;
bd[k].push_back({i, j});
}
}
void bfs(int d[mxS][mxS]) {
for(int di=0; di<mxD; ++di) {
for(array<int, 2> u : bd[di]) {
if(d[u[0]][u[1]]<di)
continue;
for(int i=0; i<4; ++i) {
array<int, 2> v=e[u[0]][u[1]][i];
if(v[0]!=-2)
ud(d, v[0], v[1], di+1);
}
}
bd[di].clear();
}
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> w >> h;
for(int i=0; i<h; ++i)
cin >> g[i];
memset(e, -1, sizeof(e));
for(int i=0; i<h; ++i)
for(int j=0; j<w; ++j)
for(int k=0; k<4; ++k)
dfs(i, j, k);
memset(d, 0x3f, sizeof(d));
for(int i=0, k=0; i<n; ++i) {
for(int j=i; j>=0; --j, ++k) {
m1[j][i]=k;
m2[k]={j, i};
if(j<i) {
for(int x=0; x<h; ++x)
for(int y=0; y<w; ++y)
for(int l=j; l<i; ++l)
ud(d[k], x, y, d[m1[j][l]][x][y]+d[m1[l+1][i]][x][y]);
} else
for(int x=0; x<h; ++x)
for(int y=0; y<w; ++y)
if(g[x][y]-'0'-1==j)
ud(d[k], x, y, 0);
bfs(d[k]);
}
}
for(int i=0; i<h; ++i)
for(int j=0; j<w; ++j)
ans=min(d[m1[0][n-1]][i][j], ans);
cout << (ans>1e9?-1:ans);
}
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