結果
| 問題 |
No.2411 Reverse Directions
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2023-08-16 12:56:06 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 4,948 bytes |
| コンパイル時間 | 1,838 ms |
| コンパイル使用メモリ | 183,928 KB |
| 実行使用メモリ | 6,820 KB |
| 最終ジャッジ日時 | 2024-11-25 01:52:22 |
| 合計ジャッジ時間 | 4,321 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 28 WA * 1 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
int h, w, k, l, r;
cin >> h >> w >> k >> l >> r;
l--;
if(r - l & 1){
cout << "No" << '\n';
exit(0);
}
if(k - (h + w - 2) & 1){
cout << "No" << '\n';
exit(0);
}
vector<string> A(h);
for(auto &&s : A) cin >> s;
auto bfs = [&](int sy, int sx){
vector<vector<int>> dp(h, vector<int>(w, 1 << 29));
queue<pair<int,int>> nxt;
nxt.emplace(sy, sx);
dp[sy][sx] = 0;
while(!nxt.empty()){
int y, x;
tie(y, x) = nxt.front();
nxt.pop();
for(int i = 0; i < 4; i++){
int ny = y + (i == 0) - (i == 1);
int nx = x + (i == 2) - (i == 3);
if(ny < 0 || nx < 0 || ny >= h || nx >= w) continue;
if(A[ny][nx] == '#') continue;
if(dp[y][x] + 1 >= dp[ny][nx]) continue;
dp[ny][nx] = dp[y][x] + 1;
nxt.emplace(ny, nx);
}
}
return dp;
};
auto dist1 = bfs(0, 0);
auto dist2 = bfs(h - 1, w - 1);
for(int y = 0; y < h; y++){
for(int x = 0; x < w; x++){
if(dist1[y][x] > l || dist2[y][x] > k - r) continue;
if(y >= 1 && y + 1 < h && A[y - 1][x] != '#' && A[y + 1][x] != '#'){
int cy = y, cx = x;
vector<pair<int,int>> dir = {{1, 0}, {-1, 0},{0, 1}, {0, -1}};
string c = "UDLR";
string ans;
while(cy != 0 || cx != 0){
for(int i = 0; i < 4; i++){
int ny, nx;
tie(ny, nx) = dir[i];
ny += cy, nx += cx;
if(ny < 0 || nx < 0 || ny >= h || nx >= w) continue;
if(dist1[ny][nx] + 1 == dist1[cy][cx]){
ans += c[i];
tie(cy, cx) = make_pair(ny, nx);
break;
}
}
}
reverse(ans.begin(), ans.end());
int rem = k - (dist1[y][x] + dist2[y][x]);
for(int j = 0; j < rem; j++){
ans += j & 1 ? 'U' : 'D';
}
c = "DURL";
cy = y, cx = x;
while(cy != h - 1 || cx != w - 1){
for(int i = 0; i < 4; i++){
int ny, nx;
tie(ny, nx) = dir[i];
ny += cy, nx += cx;
if(ny < 0 || nx < 0 || ny >= h || nx >= w) continue;
if(dist2[ny][nx] + 1 == dist2[cy][cx]){
ans += c[i];
tie(cy, cx) = make_pair(ny, nx);
break;
}
}
}
cout << "Yes" << '\n';
cout << ans << '\n';
exit(0);
}
if(x >= 1 && x + 1 < w && A[y][x - 1] != '#' && A[y][x + 1] != '#'){
int cy = y, cx = x;
vector<pair<int,int>> dir = {{1, 0}, {-1, 0},{0, 1}, {0, -1}};
string c = "UDLR";
string ans;
while(cy != 0 || cx != 0){
for(int i = 0; i < 4; i++){
int ny, nx;
tie(ny, nx) = dir[i];
ny += cy, nx += cx;
if(ny < 0 || nx < 0 || ny >= h || nx >= w) continue;
if(dist1[ny][nx] + 1 == dist1[cy][cx]){
ans += c[i];
tie(cy, cx) = make_pair(ny, nx);
break;
}
}
}
reverse(ans.begin(), ans.end());
int rem = k - (dist1[y][x] + dist2[y][x]);
for(int j = 0; j < rem; j++){
ans += j & 1 ? 'L' : 'R';
}
c = "DURL";
cy = y, cx = x;
while(cy != h - 1 || cx != w - 1){
for(int i = 0; i < 4; i++){
int ny, nx;
tie(ny, nx) = dir[i];
ny += cy, nx += cx;
if(ny < 0 || nx < 0 || ny >= h || nx >= w) continue;
if(dist2[ny][nx] + 1 == dist2[cy][cx]){
ans += c[i];
tie(cy, cx) = make_pair(ny, nx);
break;
}
}
}
cout << "Yes" << '\n';
cout << ans << '\n';
exit(0);
}
}
}
cout << "No" << '\n';
}