#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=a;i<b;i++)
using namespace std;
const int INF=INT_MAX;
int n,h,w;
char g[500][500];
pair<int,int> end_pos[500][500][4];
int dp[500][500][9][9];
vector<pair<int,int>> q[INF];
bool inside(int x,int y){
return (x>=0 && y>=0 && x<h && y<w && g[x][y]!='x');
}
int main(){
cin>>n>>w>>h;
memset(dp,0x3f,sizeof(dp));//0x3f is infinity for int
FOR(i,0,h) FOR(j,0,w){
cin>>g[i][j];
if(g[i][j]-'0'>0 && g[i][j]-'0'<10){
dp[i][j][g[i][j]-'1'][g[i][j]-'1']=0;
}
}
FOR(i,0,h)FOR(j,0,w)if(g[i][j]!='x'){
FOR(k, 0, 4) {
pair<int, int> pos = {i, j};
int d = (k + (g[i][j] == 'A') * 3 + (g[i][j] == 'C')) % 4; // NESW
while (true) {
if (d == 0) {
if (inside(pos.first - 1, pos.second)) pos.first--;
else break;
} else if (d == 1) {
if (inside(pos.first, pos.second + 1)) pos.second++;
else break;
} else if (d == 2) {
if (inside(pos.first + 1, pos.second)) pos.first++;
else break;
} else {
if (inside(pos.first, pos.second - 1)) pos.second--;
else break;
}
if (g[pos.first][pos.second] == 'A') d = (d + 3) % 4;
if (g[pos.first][pos.second] == 'C') d = (d + 1) % 4;
}
end_pos[i][j][k] = pos;
}
}
// Find the minimum no. of pushes to get robot k-l to block (i, j)
FOR(rng, 0, n) {
FOR(k, 0, n - rng) {
int l = k + rng;
FOR(i, 0, h) FOR(j, 0, w) if (g[i][j] != 'x') {
FOR(d, k, l) {
dp[i][j][k][l] =
min(dp[i][j][k][l],
dp[i][j][k][d] + dp[i][j][d + 1][l]);
}
}
}
FOR(k, 0, n - rng) {
int l = k + rng;
FOR(i, 0, h) FOR(j, 0, w) if (g[i][j] != 'x') {
if (dp[i][j][k][l] <= INF) q[dp[i][j][k][l]].push_back({i, j});
}
FOR(i, 0, INF) {
for (pair<int, int> pos : q[i]) {
int x, y;
tie(x, y) = pos;
if (dp[x][y][k][l] == i) {
FOR(d, 0, 4) {
int nx, ny;
tie(nx, ny) = end_pos[x][y][d];
if (dp[nx][ny][k][l] > dp[x][y][k][l] + 1) {
q[dp[nx][ny][k][l] = dp[x][y][k][l] + 1].push_back({nx, ny});
}
}
}
}
q[i].clear();
}
}
}
int ans = INT_MAX;
FOR(i, 0, h) FOR(j, 0, w) ans = min(ans, dp[i][j][0][n - 1]);
cout << (ans > INF ? -1 : ans);
return 0;
}
Compilation message
/usr/bin/ld: failed to convert GOTPCREL relocation; relink with --no-relax
collect2: error: ld returned 1 exit status
