| # | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 73674 | 2018-08-28T17:15:00 Z | georgerapeanu | Robots (APIO13_robots) | C++11 | 0 ms | 0 KB |
#define JUDGE 1
#include <cstdio>
#include <iostream>
#include <cstdlib>
#include <algorithm>
using namespace std;
#if JUDGE
FILE *f = stdin;
FILE *g = stdout;
#else
FILE *f = fopen("robots.in","r");
FILE *g = fopen("robots.out","w");
#endif
int n,w,h;
int dp[505][505][9][9];
pair<int,int> where_do_i_end[505][505][4];
char C[505][505];
const int dx[] = {-1,0,1,0};
const int dy[] = {0,1,0,-1};
const int inf = 1 << 28;
const int MAX_COST = 2 * 500 * 500;
vector< pair<int,int> > chestii[MAX_COST];
inline void push(int x,int y,int cost){
if(cost == inf){
return ;
}
chestii[cost].push_back({x,y});
}
void solve(int st,int dr){
for(int cost = 0;cost < MAX_COST;cost++){
for(auto pos:chestii[cost]){
if(dp[pos.first][pos.second][st][dr] != cost){
continue;
}
for(int k = 0;k < 4;k++){
pair<int,int> npos = where_do_i_end[pos.first][pos.second][k];
if(npos.first == -1 && npos.second == -1){
continue;
}
if(dp[npos.first][npos.second][st][dr] > cost + 1){
dp[npos.first][npos.second][st][dr] = cost + 1;
push(npos.first,npos.second,cost + 1);
}
}
}
chestii[cost].clear();
}
}
int which_viz[505][505][4];
int last_viz;
pair<int,int> get_end(int i,int j,int k){
if(where_do_i_end[i][j][k].first || where_do_i_end[i][j][k].second){
return where_do_i_end[i][j][k];
}
if(C[i][j] == 'x'){
where_do_i_end[i][j][k] = {-1,-1};
}
where_do_i_end[i][j][k] = {i,j};
vector< pair<pair<int,int>,int> > V = {make_pair(make_pair(i,j),k)};
which_viz[i][j][k] = ++last_viz;
pair<int,int> ans = {-1,-1};
for(int k = 0;k < (int)V.size();k++){
int dir = (V[k].second + (C[V[k].first.first][V[k].first.second] == 'C') + (C[V[k].first.first][V[k].first.second] == 'A' ? 3:0)) & 3;
int x = V[k].first.first + dx[dir];
int y = V[k].first.second + dy[dir];
if(!(x && y && x <= h && y <= w && C[x][y] != 'x')){
ans = V[k].first;
break;
}
else if(!which_viz[x][y][dir]){
V.push_back({{x,y},dir});
which_viz[x][y][dir] = last_viz;
}
else{
if(which_viz[x][y][dir] != last_viz){
ans = where_do_i_end[x][y][dir];
}
else{
break;
}
}
}
for(auto it:V){
where_do_i_end[it.first.first][it.first.second][it.second] = ans;
}
return where_do_i_end[i][j][k];
}
int main(){
fscanf(f,"%d %d %d\n",&n,&w,&h);
for(int i = 1;i <= h;i++){
fgets(C[i] + 1,505,f);
}
for(int i = 1;i <= h;i++ ){
for(int j = 1;j <= w;j++){
for(int k = 0;k < 4;k++){
where_do_i_end[i][j][k] = get_end(i,j,k);
}
}
}
for(int i = 1;i <= h;i++){
for(int j = 1;j <= w;j++){
for(int st = 0;st < n;st++){
for(int dr = 0;dr < n;dr++){
dp[i][j][st][dr] = inf;
}
}
}
}
for(int i = 1;i <= h;i++){
for(int j = 1;j <= w;j++){
if('1' <= C[i][j] && C[i][j] <= '9'){
dp[i][j][C[i][j] - '1'][C[i][j] - '1'] = 0;
push(i,j,0);
solve(C[i][j] - '1',C[i][j] - '1');
}
}
}
for(int l = 1;l < 9;l++){
for(int st = 0;st < n;st++){
int dr = st + l;
for(int i = 1;i <= h;i++){
for(int j = 1;j <= w;j++){
for(int k = st;k < dr;k++){
dp[i][j][st][dr] = min(dp[i][j][st][k] + dp[i][j][k + 1][dr],dp[i][j][st][dr]);
}
push(i,j,dp[i][j][st][dr]);
}
}
solve(st,dr);
}
}
int ans = inf;
for(int i = 1;i <= h;i++){
for(int j = 1;j <= w;j++){
if(ans > dp[i][j][0][n - 1]){
ans = dp[i][j][0][n - 1];
}
}
}
fprintf(g,"%d\n",(ans == inf ? -1:ans));
return 0;
}