Submission #922020

#	Time	Username	Problem	Language	Result	Execution time	Memory
922020		SUNWOOOOOOOO	Maze (JOI23_ho_t3)	C++17	0 / 100	1 ms	348 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using pint = array <int, 2>;
vector <vector <int>> ans, vst; // 0 based
int r, c, n, dx[4] = {0, 0, 1, -1}, dy[4] = {1, -1, 0, 0};
vector <string> A;
pint s, g;

int main()
{
    scanf("%d %d %d", &r, &c, &n);
    A.resize(r);
    ans.resize(r, vector <int> (c, -1));
    vst.resize(r, vector <int> (c, 0));
    scanf("%d %d %d %d", &s[0], &s[1], &g[0], &g[1]);
    s[0]--, s[1]--, g[0]--, g[1]--;
    for (int i = 0; i < r; i++) cin >> A[i];

    deque <pint> dq;
    ans[s[0]][s[1]] = 0;
    dq.push_front(s);
    while (!dq.empty()){
        pint now = dq.front(); dq.pop_front();
        if (vst[now[0]][now[1]]) continue;
        vst[now[0]][now[1]] = 1;
        for (int k : {0, 1, 2, 3}){
            int nx = now[0] + dx[k], ny = now[1] + dy[k];
            if (nx < 0 || ny < 0 || nx >= r || ny >= c) continue;
            if (vst[nx][ny]) continue;
            if (A[nx][ny] == A[now[0]][now[1]]){
                if (ans[nx][ny] == -1 || ans[nx][ny] > ans[now[0]][now[1]]){
                    ans[nx][ny] = ans[now[0]][now[1]];
                    dq.push_front({nx, ny});
                }
            }
            else {
                if (ans[nx][ny] == -1 || ans[nx][ny] > ans[now[0]][now[1]] + 1){
                    ans[nx][ny] = ans[now[0]][now[1]] + 1;
                    dq.push_back({nx, ny});
                }
            }
        }
    }

    printf("%d\n", ans[g[0]][g[1]]);

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf("%d %d %d", &r, &c, &n);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     scanf("%d %d %d %d", &s[0], &s[1], &g[0], &g[1]);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 19
• Subtask 3: 0 / 16
• Subtask 4: 0 / 19
• Subtask 5: 0 / 5
• Subtask 6: 0 / 19
• Subtask 7: 0 / 8
• Subtask 8: 0 / 6