結果
| 問題 |
No.1323 うしらずSwap
|
| コンテスト | |
| ユーザー |
emthrm
|
| 提出日時 | 2020-12-20 02:32:40 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,429 bytes |
| コンパイル時間 | 2,370 ms |
| コンパイル使用メモリ | 212,064 KB |
| 最終ジャッジ日時 | 2025-01-17 04:23:14 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 57 WA * 2 |
ソースコード
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
constexpr int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
IOSetup() {
std::cin.tie(nullptr);
std::ios_base::sync_with_stdio(false);
std::cout << fixed << setprecision(20);
}
} iosetup;
int main() {
int h, w, ra, ca, rb, cb; cin >> h >> w >> ra >> ca >> rb >> cb; --ra; --ca; --rb; --cb;
vector<string> s(h); REP(i, h) cin >> s[i];
vector dist(h, vector(w, -1)), dp(h, vector(w, 0));
dist[ra][ca] = 0;
dp[ra][ca] = 1;
vector prev(h, vector(w, make_pair(-1, -1)));
queue<pair<int, int>> que({{ra, ca}});
while (!que.empty()) {
auto [i, j] = que.front(); que.pop();
REP(k, 4) {
int y = i + dy[k], x = j + dx[k];
if (s[y][x] == '.') {
if (dist[y][x] == -1) {
dist[y][x] = dist[i][j] + 1;
dp[y][x] = dp[i][j];
prev[y][x] = {i, j};
que.emplace(y, x);
} else if (dist[y][x] == dist[i][j] + 1) {
dp[y][x] = min(dp[y][x] + dp[i][j], 2);
}
}
}
}
if (dist[rb][cb] == -1) {
cout << "-1\n";
return 0;
}
if (dp[rb][cb] == 2) {
cout << dist[rb][cb] * 2 << '\n';
return 0;
}
s[rb][cb] = 'b';
int cr = rb, cc = cb;
while (cr != ra || cc != ca) {
tie(cr, cc) = prev[cr][cc];
s[cr][cc] = '$';
}
s[ra][ca] = 'a';
REP(i, h) REP(j, w) {
if (s[i][j] == '$') {
REP(k, 4) {
int y = i + dy[k], x = j + dx[k];
if (s[y][x] == '.') {
cout << dist[rb][cb] * 2 + 2 << '\n';
return 0;
}
}
}
}
s[ra][ca] = '.';
s[rb][cb] = '$';
int ans = INF;
vector dista(h, vector(w, -1));
dista[ra][ca] = 0;
que.emplace(ra, ca);
while (!que.empty()) {
auto [i, j] = que.front(); que.pop();
int cnt = 0;
REP(k, 4) {
int y = i + dy[k], x = j + dx[k];
if (s[y][x] == '.') {
++cnt;
if (dista[y][x] == -1) {
dista[y][x] = dista[i][j] + 1;
que.emplace(y, x);
}
}
}
if (cnt >= 3) chmin(ans, dist[rb][cb] * 2 + (dista[i][j] + 1) * 4);
}
s[ra][ca] = '$';
REP(k, 4) {
int y = rb + dy[k], x = cb + dx[k];
if (s[y][x] == '.' && dista[y][x] != -1) chmin(ans, dist[rb][cb] + dista[y][x] + 1);
}
s[rb][cb] = '.';
vector distb(h, vector(w, -1));
distb[rb][cb] = 0;
que.emplace(rb, cb);
while (!que.empty()) {
auto [i, j] = que.front(); que.pop();
int cnt = 0;
REP(k, 4) {
int y = i + dy[k], x = j + dx[k];
if (s[y][x] == '.') {
++cnt;
if (distb[y][x] == -1) {
distb[y][x] = distb[i][j] + 1;
que.emplace(y, x);
}
}
}
if (cnt >= 3) chmin(ans, dist[rb][cb] * 2 + (distb[i][j] + 1) * 4);
}
cout << (ans == INF ? -1 : ans) << '\n';
return 0;
}
emthrm