Submission #1055237

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055237		CodeLakVN	Maze (JOI23_ho_t3)	C++17	100 / 100	434 ms	82572 KiB

Main

#include <bits/stdc++.h>

#define no "NO"
#define yes "YES"
#define F first
#define S second
#define vec vector
#define task "main"
#define ll long long
#define _mp make_pair
#define ii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define evoid(val) return void(std::cout << val)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)
#define unq(x) sort(all(x)); x.resize(unique(all(x)) - x.begin())

using namespace std;

template<typename U, typename V> bool maximize(U &a, V b) {
    if (a < b) { a = b; return 1; } return 0;
}
template<typename U, typename V> bool minimize(U &a, V b) {
    if (a > b) { a = b; return 1; } return 0;
}

const int N = (int)2e5 + 9;
const int INF = (int)1e9;
const int MOD = (int)1e9 + 7;

const int dx[4] = {-1, 0, 1, 0};
const int dy[4] = {0, 1, 0, -1};

int numRow, numCol, numSize;
vector<string> a;
vector<vector<int>> dist;

struct Data {
    int x, y, sizeVer, sizeHor;
};

bool inside(int i, int j) {
    return i >= 1 && i <= numRow && j >= 1 && j <= numCol;
}

void main_code() {
    int sR, sC, eR, eC;
    cin >> numRow >> numCol >> numSize >> sR >> sC >> eR >> eC;
    a.assign(numRow + 1, "");
    FOR(i, 1, numRow) {
        cin >> a[i];
        a[i] = " " + a[i];
    }

    dist.assign(numRow + 1, vector<int> (numCol + 1, -1));
    queue<ii> whiteQueue;
    queue<Data> blackQueue;
    dist[sR][sC] = 0;
    whiteQueue.push(make_pair(sR, sC));
    while (whiteQueue.size() + blackQueue.size()) {
        while (whiteQueue.size()) {
            int x = whiteQueue.front().F, y = whiteQueue.front().S;
            whiteQueue.pop();
            FOR(i, 0, 3) {
                int u = x + dx[i], v = y + dy[i];
                if (!inside(u, v) || dist[u][v] != -1) continue;
                if (a[u][v] == '.') {
                    dist[u][v] = dist[x][y];
                    whiteQueue.push(make_pair(u, v));
                }
                else {
                    dist[u][v] = dist[x][y] + 1;
                    blackQueue.push({u, v, numSize - 1, numSize - 1});
                }
            }
        }

        while (blackQueue.size()) {
            auto [x, y, sizeVer, sizeHor] = blackQueue.front();
            blackQueue.pop();

            if (sizeVer == 0 || sizeHor == 0) {
                whiteQueue.push(make_pair(x, y));
            }

            FOR(i, 0, 3) {
                int u = x + dx[i], v = y + dy[i];
                if (!inside(u, v)|| dist[u][v] != -1) continue;
                int newVer = sizeVer - (dy[i] != 0), newHor = sizeHor - (dx[i] != 0);
                if (newVer < 0 || newHor < 0) continue;
                dist[u][v] = dist[x][y];
                blackQueue.push({u, v, newVer, newHor});
            }
        }
    }

    cout << dist[eR][eC];
}

int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    const bool MULTITEST = 0;
    int num_test = 1; if (MULTITEST) cin >> num_test;
    while (num_test--) { main_code(); cout << "\n"; }
}

/* Lak lu theo dieu nhac */

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:104:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 19 / 19
• Subtask 3: 16 / 16
• Subtask 4: 19 / 19
• Subtask 5: 5 / 5
• Subtask 6: 19 / 19
• Subtask 7: 8 / 8
• Subtask 8: 6 / 6