結果
| 問題 |
No.340 雪の足跡
|
| コンテスト | |
| ユーザー |
ckawatak
|
| 提出日時 | 2017-10-26 11:15:59 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 3,089 bytes |
| コンパイル時間 | 850 ms |
| コンパイル使用メモリ | 81,804 KB |
| 実行使用メモリ | 49,776 KB |
| 最終ジャッジ日時 | 2024-11-21 20:02:30 |
| 合計ジャッジ時間 | 21,699 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 5 |
| other | AC * 22 TLE * 10 |
ソースコード
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
struct Block {
Block() : top(-1), bottom(-1),left(-1),right(-1) {}
int top;
int bottom;
int left;
int right;
};
int hop[(1<<10) * (1<<10)];
int INF = 1<<10;
int main(int argc, char* argv[]) {
// Retrieve data
int W,H,N; cin >> W >> H >> N;
vector<vector<int> > paths(N);
for (int i = 0; i < N; i++) {
int m; cin >> m;
for (int j = 0; j < m+1; j++) {
int b; cin >> b;
paths[i].push_back(b);
}
}
// Initialize the path for each block
int nblocks = W * H;
vector<Block> blocks(nblocks);
for (int i = 0; i < N; i++) {
vector<int> path = paths[i];
int size = path.size();
for (int j = 0; j < size-1; j++) {
int start = path[j];
int end = path[j+1];
if (end < start) {
int temp = start;
start = end;
end = temp;
}
// the starting point and the ending point are in the same row
if (start/W == end/W) {
for (int k = start; k <= end; k++) {
if (k == start) {
blocks[k].right = k+1;
}
else if (k == end) {
blocks[k].left = k-1;
}
else {
blocks[k].left = k-1;
blocks[k].right = k+1;
}
}
}
// the starting point and the ending point are NOT in the same row
else {
for (int k = start; k <= end; k+=W) {
if (k == start) {
blocks[k].top = k+W;
}
else if (k == end) {
blocks[k].bottom = k-W;
}
else {
blocks[k].bottom = k-W;
blocks[k].top = k+W;
}
}
}
}
}
// Initialize the number of hops
for (int i = 0; i < H; i++) {
for (int j = 0; j < W; j++) {
hop[i * W + j] = INF;
}
}
hop[0] = 0;
// Do BFS to search for a path
queue<int> que;
que.push(0);
int solution = -1;
while (!que.empty()) {
int current = que.front();
que.pop();
if (current == nblocks-1) {
break;
}
Block block = blocks[current];
int directions[] = {block.top, block.bottom, block.left, block.right};
for (int i = 0; i < sizeof(directions)/sizeof(int); i++) {
if (directions[i] != -1 && hop[directions[i]] == INF) {
que.push(directions[i]);
hop[directions[i]] = hop[current] + 1;
}
}
}
solution = hop[nblocks-1];
if (solution == INF) {
cout << "Odekakedekinai.." << endl;
}
else {
cout << solution << endl;
}
}
ckawatak