oj.uz

Submission #173105

# Submission time Handle Problem Language Result Execution time Memory
173105 2020-01-03T11:19:24 Z VEGAnn Bomb (IZhO17_bomb) C++14
41 / 100
 1000 ms 100472 KB 
#include <bits/stdc++.h>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define sz(x) ((int)x.size())
#define MP make_pair
#define ft first
#define sd second
#define pii pair<int, int>
#define PB push_back
using namespace std;
using namespace __gnu_pbds;
template <class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 2510;
const int oo = 2e9;
int n, m, ans, a[N][N], pref[N][N], vl[N][N], pl[N][N];

bool ok(int ht, int wd){
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            pl[i][j] = 0;

    for (int i = 1; i <= n; i++)
    for (int j = 1; j <= m; j++){
        if (i + ht - 1 > n || j + wd - 1 > m)
            break;
        int i1 = i + ht - 1, i2 = i - 1;
        int j1 = j + wd - 1, j2 = j - 1;
        int kol = pref[i1][j1] - pref[i2][j1] - pref[i1][j2] + pref[i2][j2];

        if (kol > 0) continue;

        pl[i][j]++; pl[i][j + wd]--;
        pl[i + ht][j]--; pl[i + ht][j + wd]++;

    }

    for (int i = 1; i <= n; i++){
        int cr = 0;
        for (int j = 1; j <= m; j++){
            cr += pl[i][j];
            vl[i][j] = cr;
        }
    }

    for (int j = 1; j <= m; j++){
        int cr = 0;
        for (int i = 1; i <= n; i++){
            cr += vl[i][j];
            if (a[i][j] == 1 && cr == 0)
                return 0;
        }
    }

    return 1;
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
//    freopen("in.txt","r",stdin);
    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 == '1' ? 1 : 0);
        pref[i][j] = (a[i][j] ^ 1) + pref[i - 1][j] + pref[i][j - 1] - pref[i - 1][j - 1];
    }

    int wd = m;
    for (int ht = 1; ht <= n; ht++){
        if (ht == 1){
            int l = 1, r = m;
            while (l < r){
                int md = (l + r + 1) >> 1;
                if (ok(ht, md))
                    l = md;
                else r = md - 1;
            }
            wd = l;
        } else {
            while (wd > 0 && !ok(ht, wd))
                wd--;
        }
        if (wd == 0) break;
        ans = max(ans, ht * wd);
    }

    cout << ans;

    return 0;
}

Subtask #1
41.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 632 KB Output is correct
3 Correct 45 ms 40568 KB Output is correct
4 Correct 49 ms 40568 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 476 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 632 KB Output is correct
10 Correct 2 ms 632 KB Output is correct
11 Correct 2 ms 632 KB Output is correct
12 Correct 2 ms 632 KB Output is correct
13 Correct 2 ms 632 KB Output is correct
14 Correct 2 ms 632 KB Output is correct
15 Correct 2 ms 604 KB Output is correct
16 Correct 2 ms 760 KB Output is correct
17 Correct 3 ms 1528 KB Output is correct
18 Correct 3 ms 1528 KB Output is correct
19 Correct 5 ms 2040 KB Output is correct
20 Correct 5 ms 2040 KB Output is correct
21 Correct 3 ms 1272 KB Output is correct
22 Correct 4 ms 1656 KB Output is correct
23 Correct 6 ms 2172 KB Output is correct
24 Correct 4 ms 1784 KB Output is correct
25 Correct 7 ms 2168 KB Output is correct
26 Correct 5 ms 2168 KB Output is correct
27 Correct 12 ms 6392 KB Output is correct
28 Correct 19 ms 6904 KB Output is correct
29 Correct 128 ms 8696 KB Output is correct
30 Correct 238 ms 10456 KB Output is correct
31 Correct 138 ms 8332 KB Output is correct
32 Correct 145 ms 9564 KB Output is correct
33 Correct 297 ms 11000 KB Output is correct
34 Correct 18 ms 7416 KB Output is correct
35 Correct 159 ms 11000 KB Output is correct
36 Correct 132 ms 11000 KB Output is correct
37 Correct 2 ms 632 KB Output is correct
38 Execution timed out 1088 ms 100188 KB Time limit exceeded
39 Correct 2 ms 632 KB Output is correct
40 Execution timed out 1084 ms 27128 KB Time limit exceeded
41 Correct 2 ms 632 KB Output is correct
42 Correct 8 ms 2168 KB Output is correct
43 Execution timed out 1094 ms 99960 KB Time limit exceeded
44 Correct 434 ms 11000 KB Output is correct
45 Execution timed out 1080 ms 99960 KB Time limit exceeded
46 Execution timed out 1082 ms 99980 KB Time limit exceeded
47 Execution timed out 1084 ms 100060 KB Time limit exceeded
48 Execution timed out 1088 ms 99856 KB Time limit exceeded
49 Execution timed out 1085 ms 99960 KB Time limit exceeded
50 Execution timed out 1080 ms 99832 KB Time limit exceeded
51 Execution timed out 1090 ms 99960 KB Time limit exceeded
52 Execution timed out 1089 ms 100088 KB Time limit exceeded
53 Execution timed out 1095 ms 100344 KB Time limit exceeded
54 Execution timed out 1067 ms 100472 KB Time limit exceeded
55 Execution timed out 1093 ms 100344 KB Time limit exceeded
56 Execution timed out 1076 ms 100428 KB Time limit exceeded
57 Execution timed out 1095 ms 100344 KB Time limit exceeded
58 Execution timed out 1079 ms 100344 KB Time limit exceeded
59 Execution timed out 1085 ms 100344 KB Time limit exceeded
60 Execution timed out 1080 ms 100364 KB Time limit exceeded
61 Execution timed out 1086 ms 100368 KB Time limit exceeded
62 Execution timed out 1079 ms 100344 KB Time limit exceeded
63 Execution timed out 1093 ms 100344 KB Time limit exceeded
64 Execution timed out 1088 ms 100472 KB Time limit exceeded
65 Execution timed out 1089 ms 100472 KB Time limit exceeded
66 Execution timed out 1084 ms 100344 KB Time limit exceeded
67 Execution timed out 1079 ms 99888 KB Time limit exceeded
68 Execution timed out 1073 ms 99704 KB Time limit exceeded
69 Execution timed out 1086 ms 99704 KB Time limit exceeded
70 Execution timed out 1078 ms 80120 KB Time limit exceeded
71 Execution timed out 1061 ms 99704 KB Time limit exceeded
72 Execution timed out 1076 ms 99960 KB Time limit exceeded
73 Execution timed out 1080 ms 100464 KB Time limit exceeded
74 Execution timed out 1078 ms 100324 KB Time limit exceeded
75 Execution timed out 1080 ms 100344 KB Time limit exceeded
76 Execution timed out 1077 ms 100472 KB Time limit exceeded
77 Execution timed out 1081 ms 100472 KB Time limit exceeded
78 Execution timed out 1089 ms 100196 KB Time limit exceeded
79 Execution timed out 1067 ms 99320 KB Time limit exceeded
80 Execution timed out 1082 ms 98808 KB Time limit exceeded
81 Execution timed out 1085 ms 98808 KB Time limit exceeded
82 Execution timed out 1084 ms 98936 KB Time limit exceeded
83 Execution timed out 1079 ms 98892 KB Time limit exceeded
84 Execution timed out 1070 ms 98916 KB Time limit exceeded
85 Execution timed out 1092 ms 98680 KB Time limit exceeded
86 Execution timed out 1087 ms 98552 KB Time limit exceeded
87 Execution timed out 1081 ms 98600 KB Time limit exceeded
88 Execution timed out 1074 ms 99304 KB Time limit exceeded
89 Execution timed out 1076 ms 99184 KB Time limit exceeded
90 Execution timed out 1076 ms 79384 KB Time limit exceeded
91 Execution timed out 1083 ms 99252 KB Time limit exceeded
92 Execution timed out 1065 ms 99224 KB Time limit exceeded
93 Execution timed out 1072 ms 99216 KB Time limit exceeded
94 Execution timed out 1087 ms 99192 KB Time limit exceeded
95 Execution timed out 1083 ms 99320 KB Time limit exceeded
96 Execution timed out 1068 ms 99220 KB Time limit exceeded
97 Execution timed out 1084 ms 99192 KB Time limit exceeded
98 Execution timed out 1081 ms 99240 KB Time limit exceeded
99 Execution timed out 1081 ms 99268 KB Time limit exceeded
100 Execution timed out 1095 ms 99192 KB Time limit exceeded