結果

問題 No.340 雪の足跡
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
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ファイルパターン 結果
sample AC * 5
other AC * 22 TLE * 10
権限があれば一括ダウンロードができます

ソースコード

diff # 

#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;
    }
}
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