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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#611317#7701. A (Fast) Walk in the WoodsAlorithmAC ✓150ms4912kbC++173.9kb2024-10-04 20:21:322024-10-04 20:21:33

Judging History

This is the latest submission verdict.

  • [2024-10-04 20:21:33]
  • Judged
  • Verdict: AC
  • Time: 150ms
  • Memory: 4912kb
  • [2024-10-04 20:21:32]
  • Submitted

answer

#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
using i64 = long long;
using a2 = array<int, 2>;

const int MAXN = 2505;
int n, m;
vector<a2> pos(MAXN);
vector<vector<a2>> edge(MAXN, vector<a2>(4));

// 0 N
// 1 E
// 2 S
// 3 W

void add_edge(int u, int v, int w) {
    if (pos[u][0] == pos[v][0]) {
        if (pos[u][1] > pos[v][1]) {
            edge[u][2] = { v, w };
            edge[v][0] = { u, w };
        } else {
            edge[u][0] = { v, w };
            edge[v][2] = { u, w };
        }
    } else {
        if (pos[u][0] > pos[v][0]) {
            edge[u][3] = { v, w };
            edge[v][1] = { u, w };
        } else {
            edge[u][1] = { v, w };
            edge[v][3] = { u, w };
        }
    }
}

inline int prv(int x) {
    return (x + 3) % 4;
}

inline int nxt(int x) {
    return (x + 1) % 4;
}

inline int get_dir(int now, int dir) {
    int cnt = 0;
    for (int i = prv(dir); i != (dir + 2) % 4; i = nxt(i)) {
        if (edge[now][i][1])
            cnt++;
    }

    if (cnt == 0) {
        cout << pos[now][0] << ' ' << pos[now][1] << endl;
        exit(0);
    }

    int go = -1;
    if (cnt <= 2) {
        for (int i = prv(dir); i != (dir + 2) % 4; i = nxt(i)) {
            if (edge[now][i][1]) {
                go = i;
                break;
            }
        }
    }

    if (cnt == 3) {
        for (int i = prv(dir); i != (dir + 2) % 4; i = nxt(i)) {
            if (edge[now][i][1])
                cnt--;
            if (cnt == 1) {
                go = i;
                break;
            }
        }
    }

    return go;
}

vector<vector<int>> vis_edge(MAXN, vector<int>(4));
vector<vector<bool>> vis(MAXN, vector<bool>(4)), vis_circle(MAXN, vector<bool>(4));

a2 find_circle(int now, int dir, int& minn) {
    // cout << now << ' ' << dir << ' ' << minn << endl;
    if (vis_circle[now][dir])
        return {now, dir};
    
    int go = get_dir(now, dir);

    vis_circle[now][dir] = true;
    vis_edge[now][go]++;
    vis_edge[edge[now][go][0]][(go + 2) % 4]++;
    edge[now][go][1]--;
    edge[edge[now][go][0]][(go + 2) % 4][1]--;
    minn = min(minn, edge[now][go][1] / vis_edge[now][go]);

    auto tmp = find_circle(edge[now][go][0], go, minn);

    vis_circle[now][dir] = false;
    edge[now][go][1] -= minn * vis_edge[now][go];
    edge[edge[now][go][0]][(go + 2) % 4][1] -= minn * vis_edge[now][go];
    vis_edge[now][go] = 0;
    vis_edge[edge[now][go][0]][(go + 2) % 4] = 0;

    return tmp;
}

void dfs(int now, int dir) {
    // cout << now << ' ' << dir << endl;
    if (vis[now][dir]) {
        int minn = 1 << 30;
        auto [x, y] = find_circle(now, dir, minn);
        vector<vector<bool>>(MAXN, vector<bool>(4)).swap(vis);
        dfs(x, y);
    }

    vis[now][dir] = true;
    int go = get_dir(now, dir);
    edge[now][go][1]--;
    edge[edge[now][go][0]][(go + 2) % 4][1]--;
    dfs(edge[now][go][0], go);
}

/*
1 2
   
3 4 5 6
       
    7 8

3-6-9
| | |
2-5-8
| | |
1-4-7

*/

void solve() {
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
        cin >> pos[i][0] >> pos[i][1];
    for (int i = 1; i <= m; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        // cout << u << ' ' << v << ' ' << w << endl;
        add_edge(u, v, w);
    }
    // cout << n << ' ' << m << endl;

    int now, go;
    char dir;
    cin >> now >> dir;
    if (dir == 'N')
        go = 0;
    if (dir == 'E')
        go = 1;
    if (dir == 'S')
        go = 2;
    if (dir == 'W')
        go = 3;
    // cout << now << ' ' << go << endl;

    vis[now][go] = true;
    edge[now][go][1]--;
    edge[edge[now][go][0]][(go + 2) % 4][1]--;
    // cout << edge[now][go][0] << endl;
    dfs(edge[now][go][0], go);
}

int main() {
    ios::sync_with_stdio(NULL);
    cin.tie(nullptr);

    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 1ms
memory: 4344kb

input:

7 8
0 0 5 0 12 0 0 5 5 5 0 10 12 10
1 2 2
2 3 4
4 5 5
6 7 8
1 4 4
2 5 7
3 7 4
4 6 6
4 N

output:

0 0

result:

ok single line: '0 0'

Test #2:

score: 0
Accepted
time: 1ms
memory: 4304kb

input:

2 1
5 5 100 5
1 2 10000
2 W

output:

5 5

result:

ok single line: '5 5'

Test #3:

score: 0
Accepted
time: 1ms
memory: 4596kb

input:

4 4
0 0 0 10 10 10 10 0
1 2 10
2 3 10
3 4 10
1 4 10
4 N

output:

10 0

result:

ok single line: '10 0'

Test #4:

score: 0
Accepted
time: 1ms
memory: 4220kb

input:

9 12
0 0 0 1 0 2 1 0 1 1 1 2 2 0 2 1 2 2
1 2 1
2 3 1
4 1 1
4 5 1
5 2 1
5 6 1
6 3 1
6 9 1
9 8 1
8 5 1
8 7 1
7 4 1
8 N

output:

1 0

result:

ok single line: '1 0'

Test #5:

score: 0
Accepted
time: 1ms
memory: 4208kb

input:

9 12
0 0 0 1 0 2 1 0 1 1 1 2 2 0 2 1 2 2
1 2 1
2 3 1
4 1 1
4 5 1
5 2 1
5 6 1
6 3 1
6 9 1
9 8 1
8 5 1
8 7 1
7 4 1
8 W

output:

0 1

result:

ok single line: '0 1'

Test #6:

score: 0
Accepted
time: 1ms
memory: 4300kb

input:

4 4
0 0 0 5 5 5 5 0
1 2 1
2 3 1
3 4 1
4 1 1
1 E

output:

0 0

result:

ok single line: '0 0'

Test #7:

score: 0
Accepted
time: 1ms
memory: 4284kb

input:

4 4
0 0 0 5 5 5 5 0
1 2 1
2 3 1
3 4 1
4 1 1
1 N

output:

0 0

result:

ok single line: '0 0'

Test #8:

score: 0
Accepted
time: 1ms
memory: 4364kb

input:

4 4
0 0 0 5 5 5 5 0
1 2 10000
2 3 10000
3 4 10000
4 1 10000
1 E

output:

0 0

result:

ok single line: '0 0'

Test #9:

score: 0
Accepted
time: 1ms
memory: 4592kb

input:

4 4
0 0 0 5 5 5 5 0
1 2 101
2 3 101
3 4 100
4 1 100
1 E

output:

0 0

result:

ok single line: '0 0'

Test #10:

score: 0
Accepted
time: 1ms
memory: 4348kb

input:

4 4
0 0 0 5 5 5 5 0
1 2 101
2 3 100
3 4 101
4 1 100
1 E

output:

0 0

result:

ok single line: '0 0'

Test #11:

score: 0
Accepted
time: 1ms
memory: 4456kb

input:

8 9
0 20 10 20 0 10 10 10 20 10 30 10 20 0 30 0
1 2 10
3 4 10
4 5 11
5 6 10
7 8 10
1 3 10
2 4 10
5 7 10
6 8 10
4 E

output:

20 10

result:

ok single line: '20 10'

Test #12:

score: 0
Accepted
time: 1ms
memory: 4472kb

input:

8 9
0 20 10 20 0 10 10 10 20 10 30 10 20 0 30 0
1 2 10
3 4 10
4 5 10
5 6 10
7 8 10
1 3 10
2 4 10
5 7 10
6 8 10
4 E

output:

10 10

result:

ok single line: '10 10'

Test #13:

score: 0
Accepted
time: 0ms
memory: 4296kb

input:

8 7
0 53 10 17 25 8 25 17 37 0 0 8 10 0 37 53
1 8 100
4 2 200
6 3 100
1 6 100
7 2 100
4 3 100
5 8 100
7 N

output:

37 0

result:

ok single line: '37 0'

Test #14:

score: 0
Accepted
time: 0ms
memory: 4624kb

input:

2400 2999
0 0 1 0 1 1 0 1 2 0 3 0 3 1 2 1 4 0 5 0 5 1 4 1 6 0 7 0 7 1 6 1 8 0 9 0 9 1 8 1 10 0 11 0 11 1 10 1 12 0 13 0 13 1 12 1 14 0 15 0 15 1 14 1 16 0 17 0 17 1 16 1 18 0 19 0 19 1 18 1 20 0 21 0 21 1 20 1 22 0 23 0 23 1 22 1 24 0 25 0 25 1 24 1 26 0 27 0 27 1 26 1 28 0 29 0 29 1 28 1 30 0 31 0 ...

output:

0 1

result:

ok single line: '0 1'

Test #15:

score: 0
Accepted
time: 77ms
memory: 4884kb

input:

2500 3748
0 0 0 10 10 0 10 10 20 0 20 10 30 0 30 10 40 0 40 10 50 0 50 10 60 0 60 10 70 0 70 10 80 0 80 10 90 0 90 10 100 0 100 10 110 0 110 10 120 0 120 10 130 0 130 10 140 0 140 10 150 0 150 10 160 0 160 10 170 0 170 10 180 0 180 10 190 0 190 10 200 0 200 10 210 0 210 10 220 0 220 10 230 0 230 10 ...

output:

12490 10

result:

ok single line: '12490 10'

Test #16:

score: 0
Accepted
time: 4ms
memory: 4704kb

input:

2500 2548
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 200 0 210 0 220 0 230 0 240 0 250 0 260 0 270 0 280 0 290 0 300 0 310 0 320 0 330 0 340 0 350 0 360 0 370 0 380 0 390 0 400 0 410 0 420 0 430 0 440 0 450 0 460 0 470 0 480 0 490 0 0...

output:

490 0

result:

ok single line: '490 0'

Test #17:

score: 0
Accepted
time: 0ms
memory: 4644kb

input:

2500 2524
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 200 0 210 0 220 0 230 0 240 0 250 0 260 0 270 0 280 0 290 0 300 0 310 0 320 0 330 0 340 0 350 0 360 0 370 0 380 0 390 0 400 0 410 0 420 0 430 0 440 0 450 0 460 0 470 0 480 0 490 0 0...

output:

240 250

result:

ok single line: '240 250'

Test #18:

score: 0
Accepted
time: 2ms
memory: 4168kb

input:

2500 4420
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 200 0 210 0 220 0 230 0 240 0 250 0 260 0 270 0 280 0 290 0 300 0 310 0 320 0 330 0 340 0 350 0 360 0 370 0 380 0 390 0 400 0 410 0 420 0 430 0 440 0 450 0 460 0 470 0 480 0 490 0 0...

output:

40 130

result:

ok single line: '40 130'

Test #19:

score: 0
Accepted
time: 0ms
memory: 4216kb

input:

2500 4373
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 200 0 210 0 220 0 230 0 240 0 250 0 260 0 270 0 280 0 290 0 300 0 310 0 320 0 330 0 340 0 350 0 360 0 370 0 380 0 390 0 400 0 410 0 420 0 430 0 440 0 450 0 460 0 470 0 480 0 490 0 5...

output:

70 70

result:

ok single line: '70 70'

Test #20:

score: 0
Accepted
time: 0ms
memory: 4436kb

input:

2500 3891
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 200 0 210 0 220 0 230 0 240 0 0 10 10 10 20 10 30 10 40 10 50 10 60 10 70 10 80 10 90 10 100 10 110 10 120 10 130 10 140 10 150 10 160 10 170 10 180 10 190 10 200 10 210 10 220 10 2...

output:

70 160

result:

ok single line: '70 160'

Test #21:

score: 0
Accepted
time: 2ms
memory: 4224kb

input:

2500 4352
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 200 0 210 0 220 0 230 0 240 0 250 0 260 0 270 0 280 0 290 0 300 0 310 0 320 0 330 0 340 0 350 0 360 0 370 0 380 0 390 0 400 0 410 0 420 0 430 0 440 0 450 0 460 0 470 0 480 0 490 0 5...

output:

300 190

result:

ok single line: '300 190'

Test #22:

score: 0
Accepted
time: 2ms
memory: 4308kb

input:

2500 4363
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 0 10 10 10 20 10 30 10 40 10 50 10 60 10 70 10 80 10 90 10 100 10 110 10 120 10 130 10 140 10 150 10 160 10 170 10 180 10 190 10 0 20 10 20 20 20 30 20 40 20 50 20 60 20 70 20 80 20...

output:

100 170

result:

ok single line: '100 170'

Test #23:

score: 0
Accepted
time: 2ms
memory: 4304kb

input:

2500 4043
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 200 0 210 0 220 0 230 0 240 0 250 0 260 0 270 0 280 0 290 0 300 0 310 0 320 0 330 0 340 0 350 0 360 0 370 0 380 0 390 0 400 0 410 0 420 0 430 0 440 0 450 0 460 0 470 0 480 0 490 0 5...

output:

130 90

result:

ok single line: '130 90'

Test #24:

score: 0
Accepted
time: 2ms
memory: 4572kb

input:

2500 2812
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 0 10 10 10 20 10 30 10 40 10 50 10 60 10 70 10 80 10 90 10 0 20 10 20 20 20 30 20 40 20 50 20 60 20 70 20 80 20 90 20 0 30 10 30 20 30 30 30 40 30 50 30 60 30 70 30 80 30 90 30 0 40 10 40 20 40 30 40 40 40 50 40 60 40 70 40 80 40 90 40 0 50 ...

output:

0 10

result:

ok single line: '0 10'

Test #25:

score: 0
Accepted
time: 2ms
memory: 4416kb

input:

2500 4009
0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 110 0 120 0 130 0 140 0 150 0 160 0 170 0 180 0 190 0 200 0 210 0 220 0 230 0 240 0 250 0 260 0 270 0 280 0 290 0 300 0 310 0 320 0 330 0 340 0 350 0 360 0 370 0 380 0 390 0 400 0 410 0 420 0 430 0 440 0 450 0 460 0 470 0 480 0 490 0 5...

output:

300 30

result:

ok single line: '300 30'

Test #26:

score: 0
Accepted
time: 0ms
memory: 4228kb

input:

2500 4044
0 0 10 0 20 0 30 0 40 0 0 10 10 10 20 10 30 10 40 10 0 20 10 20 20 20 30 20 40 20 0 30 10 30 20 30 30 30 40 30 0 40 10 40 20 40 30 40 40 40 0 50 10 50 20 50 30 50 40 50 0 60 10 60 20 60 30 60 40 60 0 70 10 70 20 70 30 70 40 70 0 80 10 80 20 80 30 80 40 80 0 90 10 90 20 90 30 90 40 90 0 100...

output:

0 150

result:

ok single line: '0 150'

Test #27:

score: 0
Accepted
time: 150ms
memory: 4912kb

input:

2500 3748
0 998809 1000000 998809 0 998163 1000000 998163 0 996915 1000000 996915 0 996154 1000000 996154 0 994351 1000000 994351 0 993498 1000000 993498 0 992719 1000000 992719 0 992353 1000000 992353 0 991299 1000000 991299 0 991255 1000000 991255 0 990904 1000000 990904 0 989447 1000000 989447 0 ...

output:

1000000 0

result:

ok single line: '1000000 0'