oj.uz

Submission #1056555

# Submission time Handle Problem Language Result Execution time Memory
1056555 2024-08-13T10:00:56 Z Ignut Soccer Stadium (IOI23_soccer) C++17
52 / 100
 2765 ms 151300 KB 
/* Ignut
started: 13.08.2024
now: 13.08.2024
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*/

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

const int MAXN = 2222;
int n;
vector<vector<int>> f;

bool used[MAXN][MAXN];

vector<pair<int, int>> delta = {{0, -1}, {0, 1}, {-1, 0}, {1, 0}};

bool Good(int i, int j) {
    return i >= 0 && j >= 0 && i < n && j < n && f[i][j] == 0 && !used[i][j];
}

int cnt = 0;
void dfs(int i, int j) {
    cnt ++;
    used[i][j] = true;
    for (auto [di, dj] : delta) {
        int ci = i + di, cj = j + dj;
        if (Good(ci, cj)) {
            dfs(ci, cj);
        }
    }
}

int Check() {
    for (int i = 0; i < n; i ++)
        for (int j = 0; j < n; j ++)
            used[i][j] = false;
    int prev_l = -1, prev_r = -1;
    bool have_sm = false;
    for (int i = 0; i < n; i ++) {
        int first = -1, last = -1, cnt = 0;
        for (int j = 0; j < n; j ++) {
            if (f[i][j] == 1) continue;
            if (first == -1) first = j;
            last = j;
            cnt ++;
        }
        if (cnt > 0 && cnt != last - first + 1) return 0;

        if (prev_l == -1) {
            prev_l = first;
            prev_r = last;
            continue;
        }
        if (cnt == 0) continue;

        bool sm = false;
        if (first > prev_l || last < prev_r) sm = true;
        bool bg = false;
        if (first < prev_l || last > prev_r) bg = true;
        
        if (sm && bg) return 0;
        if (bg && have_sm) return 0;
        if (sm) have_sm = true;

        prev_l = first;
        prev_r = last;
    }

    prev_l = -1, prev_r = -1;
    have_sm = false;
    for (int j = 0; j < n; j ++) {
        int first = -1, last = -1, cnt = 0;
        for (int i = 0; i < n; i ++) {
            if (f[i][j] == 1) continue;
            if (first == -1) first = i;
            last = i;
            cnt ++;
        }
        if (cnt > 0 && cnt != last - first + 1) return 0;
     
        if (prev_l == -1) {
            prev_l = first;
            prev_r = last;
            continue;
        }
        if (cnt == 0) continue;

        bool sm = false;
        if (first > prev_l || last < prev_r) sm = true;
        bool bg = false;
        if (first < prev_l || last > prev_r) bg = true;
        
        if (sm && bg) return 0;
        if (bg && have_sm) return 0;
        if (sm) have_sm = true;
        
        prev_l = first;
        prev_r = last;
    }

    for (int i = 0; i < n; i ++) {
        for (int j = 0; j < n; j ++) {
            if (f[i][j] == 1) continue;
            int up = 0;
            for (int ii = i; ii >= 0; ii --) {
                if (f[ii][j] == 1) break;
                up ++;
            }
            int left = 0;
            for (int jj = j; jj >= 0; jj --) {
                if (f[i][jj] == 1) break;
                left ++;
            }
            if (Good(i - up, j - left)) return 0;

            int right = 0;
            for (int jj = j; jj < n; jj ++) {
                if (f[i][jj] == 1) break;
                right ++;
            }
            if (Good(i - up, j + right)) return 0;
        }
    }

    int i0, j0;
    for (int i = 0; i < n; i ++)
        for (int j = 0; j < n; j ++)
            if (f[i][j] == 0)
                i0 = i, j0 = j;
    cnt = 0;
    dfs(i0, j0);

    int sum = n * n;
    for (int i = 0; i < n; i ++)
        for (int j = 0; j < n; j ++)
            sum -= f[i][j];

    if (cnt != sum) return 0;
    
    // for (int i = 0; i < n; i ++) {
    //     for (int j = 0; j < n; j ++) {
    //         cout << f[i][j] << ' ';
    //     }
    //     cout << '\n';
    // }
    // cout << '\n';

    return sum;
}

vector<vector<int>> FF;

int res = 1;

void Rec(int i) {
    if (i == n) return;
    for (int l = 0; l < n; l ++) {
        for (int r = l; r < n; r ++) {
            bool ok = true;
            for (int j = l; j <= r; j ++) {
                if (FF[i][j] == 1) {
                    ok = false; break;
                }
            }
            if (!ok) continue;

            for (int j = l; j <= r; j ++) f[i][j] = 0;

            int ch = Check();
            res = max(res, ch);
            if (ch > 0) {
                Rec(i + 1);
            }
            for (int j = l; j <= r; j ++) f[i][j] = 1;
        }
    }
    Rec(i + 1);
}

int biggest_stadium(int N, vector<vector<int>> F) {
    int cntT = 0;
    for (int i = 0; i < N; i ++)
        for (int j = 0; j < N; j ++)
            cntT += F[i][j];
    if (cntT <= 1) {
        for (int i = 0; i < N; i ++) {
            for (int j = 0; j < N; j ++) {
                if (F[i][j] == 0) continue;
                int mn = N * N;
                mn = min(mn, (i + 1) * (j + 1));
                mn = min(mn, (N - i) * (N - j));
                mn = min(mn, (N - i) * (j + 1));
                mn = min(mn, (i + 1) * (N - j));
                return N * N - mn;
            }
        }
        return N * N;
    }
    
    n = N;
    f = F;
    FF = F;

    if (N > 8) return max(1, Check());

    for (int i = 0; i < N; i ++)
        for (int j = 0; j < N; j ++)
            f[i][j] = 1;
    Rec(0);

    return res;
}

Compilation message

soccer.cpp: In function 'int Check()':
soccer.cpp:155:8: warning: 'j0' may be used uninitialized in this function [-Wmaybe-uninitialized]
  155 |     dfs(i0, j0);
      |     ~~~^~~~~~~~
soccer.cpp:155:8: warning: 'i0' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 456 KB ok

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB ok
2 Correct 0 ms 348 KB ok
3 Correct 0 ms 348 KB ok
4 Correct 0 ms 348 KB ok
5 Correct 0 ms 348 KB ok
6 Correct 0 ms 348 KB ok
7 Correct 0 ms 348 KB ok
8 Correct 16 ms 2212 KB ok
9 Correct 233 ms 31792 KB ok

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB ok
2 Correct 0 ms 348 KB ok
3 Correct 0 ms 348 KB ok
4 Correct 0 ms 348 KB ok
5 Correct 0 ms 348 KB ok
6 Correct 0 ms 348 KB ok
7 Correct 0 ms 348 KB ok
8 Correct 0 ms 348 KB ok
9 Correct 0 ms 348 KB ok
10 Correct 0 ms 348 KB ok
11 Correct 0 ms 348 KB ok
12 Correct 0 ms 348 KB ok
13 Correct 0 ms 348 KB ok

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 456 KB ok
2 Correct 0 ms 348 KB ok
3 Correct 0 ms 348 KB ok
4 Correct 0 ms 348 KB ok
5 Correct 0 ms 348 KB ok
6 Correct 0 ms 348 KB ok
7 Correct 0 ms 348 KB ok
8 Correct 0 ms 348 KB ok
9 Correct 0 ms 348 KB ok
10 Correct 0 ms 348 KB ok
11 Correct 0 ms 348 KB ok
12 Correct 0 ms 348 KB ok
13 Correct 0 ms 348 KB ok
14 Correct 0 ms 348 KB ok
15 Correct 1724 ms 432 KB ok
16 Correct 215 ms 348 KB ok
17 Correct 9 ms 348 KB ok
18 Correct 1 ms 348 KB ok
19 Correct 0 ms 348 KB ok
20 Correct 0 ms 348 KB ok
21 Correct 0 ms 348 KB ok
22 Correct 1 ms 348 KB ok
23 Correct 1 ms 348 KB ok
24 Correct 1 ms 348 KB ok
25 Correct 8 ms 348 KB ok
26 Correct 52 ms 600 KB ok

Subtask #4
4.5 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 456 KB ok
2 Correct 0 ms 348 KB ok
3 Correct 0 ms 348 KB ok
4 Correct 0 ms 348 KB ok
5 Correct 0 ms 348 KB ok
6 Correct 0 ms 348 KB ok
7 Correct 0 ms 348 KB ok
8 Correct 0 ms 348 KB ok
9 Correct 0 ms 348 KB ok
10 Correct 0 ms 348 KB ok
11 Correct 0 ms 348 KB ok
12 Correct 0 ms 348 KB ok
13 Correct 0 ms 348 KB ok
14 Correct 0 ms 348 KB ok
15 Correct 0 ms 348 KB ok
16 Correct 0 ms 348 KB ok
17 Correct 1724 ms 432 KB ok
18 Correct 215 ms 348 KB ok
19 Correct 9 ms 348 KB ok
20 Correct 1 ms 348 KB ok
21 Correct 0 ms 348 KB ok
22 Correct 0 ms 348 KB ok
23 Correct 0 ms 348 KB ok
24 Correct 1 ms 348 KB ok
25 Correct 1 ms 348 KB ok
26 Correct 1 ms 348 KB ok
27 Correct 8 ms 348 KB ok
28 Correct 52 ms 600 KB ok
29 Correct 13 ms 344 KB ok
30 Partially correct 0 ms 444 KB partial
31 Partially correct 0 ms 348 KB partial
32 Partially correct 1 ms 604 KB partial
33 Partially correct 0 ms 344 KB partial
34 Correct 1 ms 348 KB ok
35 Correct 0 ms 348 KB ok
36 Partially correct 0 ms 376 KB partial
37 Partially correct 1 ms 348 KB partial
38 Partially correct 0 ms 348 KB partial
39 Partially correct 0 ms 604 KB partial
40 Partially correct 0 ms 348 KB partial
41 Partially correct 0 ms 504 KB partial

Subtask #5
4.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 456 KB ok
2 Correct 0 ms 348 KB ok
3 Correct 0 ms 348 KB ok
4 Correct 0 ms 348 KB ok
5 Correct 0 ms 348 KB ok
6 Correct 0 ms 348 KB ok
7 Correct 0 ms 348 KB ok
8 Correct 0 ms 348 KB ok
9 Correct 0 ms 348 KB ok
10 Correct 0 ms 348 KB ok
11 Correct 0 ms 348 KB ok
12 Correct 0 ms 348 KB ok
13 Correct 0 ms 348 KB ok
14 Correct 0 ms 348 KB ok
15 Correct 0 ms 348 KB ok
16 Correct 0 ms 348 KB ok
17 Correct 1724 ms 432 KB ok
18 Correct 215 ms 348 KB ok
19 Correct 9 ms 348 KB ok
20 Correct 1 ms 348 KB ok
21 Correct 0 ms 348 KB ok
22 Correct 0 ms 348 KB ok
23 Correct 0 ms 348 KB ok
24 Correct 1 ms 348 KB ok
25 Correct 1 ms 348 KB ok
26 Correct 1 ms 348 KB ok
27 Correct 8 ms 348 KB ok
28 Correct 52 ms 600 KB ok
29 Correct 13 ms 344 KB ok
30 Partially correct 0 ms 444 KB partial
31 Partially correct 0 ms 348 KB partial
32 Partially correct 1 ms 604 KB partial
33 Partially correct 0 ms 344 KB partial
34 Correct 1 ms 348 KB ok
35 Correct 0 ms 348 KB ok
36 Partially correct 0 ms 376 KB partial
37 Partially correct 1 ms 348 KB partial
38 Partially correct 0 ms 348 KB partial
39 Partially correct 0 ms 604 KB partial
40 Partially correct 0 ms 348 KB partial
41 Partially correct 0 ms 504 KB partial
42 Partially correct 11 ms 7004 KB partial
43 Partially correct 12 ms 7004 KB partial
44 Partially correct 15 ms 7064 KB partial
45 Partially correct 15 ms 7128 KB partial
46 Partially correct 22 ms 6992 KB partial
47 Partially correct 13 ms 7060 KB partial
48 Correct 55 ms 12000 KB ok
49 Partially correct 13 ms 7116 KB partial
50 Partially correct 21 ms 6996 KB partial
51 Partially correct 21 ms 7000 KB partial
52 Partially correct 13 ms 7004 KB partial
53 Partially correct 18 ms 7004 KB partial
54 Partially correct 14 ms 7000 KB partial
55 Partially correct 29 ms 7056 KB partial
56 Partially correct 14 ms 7256 KB partial
57 Partially correct 11 ms 7000 KB partial
58 Partially correct 12 ms 6928 KB partial
59 Partially correct 12 ms 6932 KB partial

Subtask #6
7.5 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 456 KB ok
2 Correct 0 ms 348 KB ok
3 Correct 0 ms 348 KB ok
4 Correct 0 ms 348 KB ok
5 Correct 0 ms 348 KB ok
6 Correct 0 ms 348 KB ok
7 Correct 0 ms 348 KB ok
8 Correct 0 ms 348 KB ok
9 Correct 16 ms 2212 KB ok
10 Correct 233 ms 31792 KB ok
11 Correct 0 ms 348 KB ok
12 Correct 0 ms 348 KB ok
13 Correct 0 ms 348 KB ok
14 Correct 0 ms 348 KB ok
15 Correct 0 ms 348 KB ok
16 Correct 0 ms 348 KB ok
17 Correct 0 ms 348 KB ok
18 Correct 0 ms 348 KB ok
19 Correct 0 ms 348 KB ok
20 Correct 0 ms 348 KB ok
21 Correct 0 ms 348 KB ok
22 Correct 1724 ms 432 KB ok
23 Correct 215 ms 348 KB ok
24 Correct 9 ms 348 KB ok
25 Correct 1 ms 348 KB ok
26 Correct 0 ms 348 KB ok
27 Correct 0 ms 348 KB ok
28 Correct 0 ms 348 KB ok
29 Correct 1 ms 348 KB ok
30 Correct 1 ms 348 KB ok
31 Correct 1 ms 348 KB ok
32 Correct 8 ms 348 KB ok
33 Correct 52 ms 600 KB ok
34 Correct 13 ms 344 KB ok
35 Partially correct 0 ms 444 KB partial
36 Partially correct 0 ms 348 KB partial
37 Partially correct 1 ms 604 KB partial
38 Partially correct 0 ms 344 KB partial
39 Correct 1 ms 348 KB ok
40 Correct 0 ms 348 KB ok
41 Partially correct 0 ms 376 KB partial
42 Partially correct 1 ms 348 KB partial
43 Partially correct 0 ms 348 KB partial
44 Partially correct 0 ms 604 KB partial
45 Partially correct 0 ms 348 KB partial
46 Partially correct 0 ms 504 KB partial
47 Partially correct 11 ms 7004 KB partial
48 Partially correct 12 ms 7004 KB partial
49 Partially correct 15 ms 7064 KB partial
50 Partially correct 15 ms 7128 KB partial
51 Partially correct 22 ms 6992 KB partial
52 Partially correct 13 ms 7060 KB partial
53 Correct 55 ms 12000 KB ok
54 Partially correct 13 ms 7116 KB partial
55 Partially correct 21 ms 6996 KB partial
56 Partially correct 21 ms 7000 KB partial
57 Partially correct 13 ms 7004 KB partial
58 Partially correct 18 ms 7004 KB partial
59 Partially correct 14 ms 7000 KB partial
60 Partially correct 29 ms 7056 KB partial
61 Partially correct 14 ms 7256 KB partial
62 Partially correct 11 ms 7000 KB partial
63 Partially correct 12 ms 6928 KB partial
64 Partially correct 12 ms 6932 KB partial
65 Partially correct 254 ms 73816 KB partial
66 Partially correct 191 ms 73880 KB partial
67 Partially correct 173 ms 73888 KB partial
68 Partially correct 194 ms 73972 KB partial
69 Partially correct 180 ms 73812 KB partial
70 Partially correct 230 ms 73880 KB partial
71 Partially correct 210 ms 73788 KB partial
72 Partially correct 183 ms 73752 KB partial
73 Correct 2689 ms 151300 KB ok
74 Correct 2765 ms 151044 KB ok
75 Partially correct 221 ms 73760 KB partial
76 Partially correct 222 ms 73792 KB partial
77 Partially correct 172 ms 73812 KB partial
78 Partially correct 233 ms 73792 KB partial
79 Partially correct 212 ms 73944 KB partial
80 Partially correct 186 ms 73808 KB partial
81 Partially correct 254 ms 73972 KB partial
82 Partially correct 247 ms 73820 KB partial
83 Partially correct 257 ms 73760 KB partial
84 Partially correct 265 ms 73812 KB partial
85 Partially correct 280 ms 74040 KB partial
86 Partially correct 319 ms 73944 KB partial
87 Partially correct 388 ms 73808 KB partial
88 Partially correct 215 ms 73812 KB partial
89 Partially correct 168 ms 73812 KB partial
90 Partially correct 221 ms 74180 KB partial
91 Partially correct 172 ms 73816 KB partial
92 Partially correct 183 ms 73956 KB partial
93 Partially correct 182 ms 73808 KB partial
94 Partially correct 180 ms 73936 KB partial
95 Partially correct 172 ms 73780 KB partial
96 Partially correct 187 ms 73736 KB partial
97 Partially correct 168 ms 73808 KB partial
98 Partially correct 196 ms 73748 KB partial
99 Partially correct 209 ms 73808 KB partial
100 Partially correct 174 ms 73812 KB partial
101 Partially correct 172 ms 73832 KB partial
102 Partially correct 172 ms 73808 KB partial
103 Partially correct 174 ms 73808 KB partial
104 Partially correct 168 ms 73908 KB partial
105 Partially correct 172 ms 73808 KB partial
106 Partially correct 178 ms 73808 KB partial
107 Partially correct 171 ms 73812 KB partial
108 Partially correct 176 ms 73980 KB partial
109 Partially correct 195 ms 73808 KB partial