oj.uz

Submission #682566

# Submission time Handle Problem Language Result Execution time Memory
682566 2023-01-16T14:14:44 Z opPO Bomb (IZhO17_bomb) C++17
41 / 100
 1000 ms 73924 KB 
#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>

using namespace std;

#define f first
#define s second
#define pb push_back
#define ld long double
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define vec vector

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

mt19937_64 gen(chrono::steady_clock::now().time_since_epoch().count());
const ld eps = 1e-6;
const int mod = 998244353;
const int oo = 2e9;
const ll OO = 2e18;
const int N = 2501;
int n, m, a[N][N], pref[N][N], p[N][N];

int get(int x1, int y1, int x2, int y2)
{
    return pref[x2][y2] - pref[x1 - 1][y2] - pref[x2][y1 - 1] + pref[x1 - 1][y1 - 1];
}

bool check(int h, int w)
{
    for (int i = 1; i <= n; i++) for (int j = 1; j <= m; j++) p[i][j] = 0;
    for (int x1 = 1; x1 <= n; x1++)
    {
        for (int y1 = 1; y1 <= m; y1++)
        {
            int x2 = x1 + h - 1, y2 = y1 + w - 1;
            if (x2 > n || y2 > m) break;
            if (get(x1, y1, x2, y2) == h * w)
            {
                p[x1][y1]++;
                p[x1][y2 + 1]--;
                p[x2 + 1][y1]--;
                p[x2 + 1][y2 + 1]++;
            }
        }
    }
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= m; j++)
        {
            p[i][j] += p[i - 1][j];
            p[i][j] += p[i][j - 1];
            p[i][j] -= p[i - 1][j - 1];
            if (a[i][j] == 1 && p[i][j] == 0) return false;
        }
    }
    return true;
}

void solve()
{
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= m; j++)
        {
            char c;
            cin >> c;
            a[i][j] = c - '0';
            pref[i][j] += a[i][j];
            pref[i][j] += pref[i - 1][j];
            pref[i][j] += pref[i][j - 1];
            pref[i][j] -= pref[i - 1][j - 1];
        }
    }
    int ans = 0;
    int ptr = m;
    for (int h = 1; h <= n; h++)
    {
        while (ptr >= 1 && !check(h, ptr)) ptr--;
        ans = max(ans, h * ptr);
    }
    cout << ans;
}

int32_t main()
{
//    freopen("bomb.in", "r", stdin);
//    freopen("bomb.out", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    solve();
    return 0;
}

Subtask #1
41.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 468 KB Output is correct
3 Correct 22 ms 30444 KB Output is correct
4 Correct 21 ms 30356 KB Output is correct
5 Correct 4 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 468 KB Output is correct
9 Correct 0 ms 468 KB Output is correct
10 Correct 0 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 0 ms 468 KB Output is correct
13 Correct 0 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 0 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 1108 KB Output is correct
18 Correct 2 ms 1236 KB Output is correct
19 Correct 2 ms 1492 KB Output is correct
20 Correct 2 ms 1492 KB Output is correct
21 Correct 1 ms 980 KB Output is correct
22 Correct 2 ms 1236 KB Output is correct
23 Correct 2 ms 1620 KB Output is correct
24 Correct 2 ms 1320 KB Output is correct
25 Correct 4 ms 1620 KB Output is correct
26 Correct 2 ms 1620 KB Output is correct
27 Correct 23 ms 4824 KB Output is correct
28 Correct 33 ms 5156 KB Output is correct
29 Correct 78 ms 6504 KB Output is correct
30 Correct 122 ms 7720 KB Output is correct
31 Correct 84 ms 6104 KB Output is correct
32 Correct 89 ms 7040 KB Output is correct
33 Correct 143 ms 8116 KB Output is correct
34 Correct 22 ms 5588 KB Output is correct
35 Correct 79 ms 8112 KB Output is correct
36 Correct 136 ms 8120 KB Output is correct
37 Correct 0 ms 468 KB Output is correct
38 Execution timed out 1098 ms 73924 KB Time limit exceeded
39 Correct 1 ms 468 KB Output is correct
40 Execution timed out 1080 ms 19896 KB Time limit exceeded
41 Correct 0 ms 468 KB Output is correct
42 Correct 3 ms 1620 KB Output is correct
43 Execution timed out 1088 ms 73728 KB Time limit exceeded
44 Correct 192 ms 8120 KB Output is correct
45 Execution timed out 1094 ms 73668 KB Time limit exceeded
46 Execution timed out 1093 ms 73692 KB Time limit exceeded
47 Execution timed out 1101 ms 73680 KB Time limit exceeded
48 Execution timed out 1099 ms 73724 KB Time limit exceeded
49 Execution timed out 1087 ms 73732 KB Time limit exceeded
50 Execution timed out 1096 ms 73620 KB Time limit exceeded
51 Execution timed out 1096 ms 73668 KB Time limit exceeded
52 Execution timed out 1100 ms 73604 KB Time limit exceeded
53 Execution timed out 1095 ms 73708 KB Time limit exceeded
54 Execution timed out 1089 ms 73808 KB Time limit exceeded
55 Execution timed out 1058 ms 73700 KB Time limit exceeded
56 Execution timed out 1088 ms 73648 KB Time limit exceeded
57 Execution timed out 1100 ms 73708 KB Time limit exceeded
58 Execution timed out 1094 ms 73704 KB Time limit exceeded
59 Execution timed out 1090 ms 73676 KB Time limit exceeded
60 Execution timed out 1089 ms 73724 KB Time limit exceeded
61 Execution timed out 1099 ms 73676 KB Time limit exceeded
62 Execution timed out 1092 ms 73728 KB Time limit exceeded
63 Execution timed out 1084 ms 73736 KB Time limit exceeded
64 Execution timed out 1084 ms 73728 KB Time limit exceeded
65 Execution timed out 1085 ms 73628 KB Time limit exceeded
66 Execution timed out 1095 ms 73608 KB Time limit exceeded
67 Execution timed out 1096 ms 73676 KB Time limit exceeded
68 Execution timed out 1090 ms 73700 KB Time limit exceeded
69 Execution timed out 1087 ms 73676 KB Time limit exceeded
70 Execution timed out 1091 ms 59044 KB Time limit exceeded
71 Execution timed out 1096 ms 73672 KB Time limit exceeded
72 Execution timed out 1097 ms 73696 KB Time limit exceeded
73 Execution timed out 1089 ms 73672 KB Time limit exceeded
74 Execution timed out 1077 ms 73664 KB Time limit exceeded
75 Execution timed out 1091 ms 73676 KB Time limit exceeded
76 Execution timed out 1096 ms 73704 KB Time limit exceeded
77 Execution timed out 1093 ms 73632 KB Time limit exceeded
78 Execution timed out 1098 ms 73724 KB Time limit exceeded
79 Execution timed out 1098 ms 73784 KB Time limit exceeded
80 Execution timed out 1100 ms 73676 KB Time limit exceeded
81 Execution timed out 1104 ms 73676 KB Time limit exceeded
82 Execution timed out 1104 ms 73620 KB Time limit exceeded
83 Execution timed out 1093 ms 73608 KB Time limit exceeded
84 Execution timed out 1099 ms 73700 KB Time limit exceeded
85 Execution timed out 1100 ms 73676 KB Time limit exceeded
86 Execution timed out 1091 ms 73732 KB Time limit exceeded
87 Execution timed out 1097 ms 73676 KB Time limit exceeded
88 Execution timed out 1073 ms 73672 KB Time limit exceeded
89 Execution timed out 1094 ms 73676 KB Time limit exceeded
90 Execution timed out 1101 ms 59032 KB Time limit exceeded
91 Execution timed out 1080 ms 73660 KB Time limit exceeded
92 Execution timed out 1063 ms 73808 KB Time limit exceeded
93 Execution timed out 1101 ms 73732 KB Time limit exceeded
94 Execution timed out 1103 ms 73612 KB Time limit exceeded
95 Execution timed out 1104 ms 73664 KB Time limit exceeded
96 Execution timed out 1099 ms 73652 KB Time limit exceeded
97 Execution timed out 1082 ms 73752 KB Time limit exceeded
98 Execution timed out 1075 ms 73676 KB Time limit exceeded
99 Execution timed out 1073 ms 73676 KB Time limit exceeded
100 Execution timed out 1100 ms 73736 KB Time limit exceeded