oj.uz

Submission #835450

# Submission time Handle Problem Language Result Execution time Memory
835450 2023-08-23T14:38:18 Z vjudge1 Bomb (IZhO17_bomb) C++17
32 / 100
 1000 ms 101680 KB 
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*******************************************************************************/
#include <bits/stdc++.h>

using namespace std;


const int N = 3e3 + 5;
int n, m;
int mp[N][N], pre[N][N];

bool bisa(int w, int h){
    int mpt[n + 1][m + 1];
    int sz = w*h;
    memset(mpt, 0, sizeof(mpt));
    for(int i = 1; i + w - 1 <= n; i++){
        for(int j = 1; j + h - 1 <= m; j++){
            int bi = i + w - 1, bj = j + h - 1;
            if(pre[bi][bj] + pre[i - 1][j - 1] - pre[i - 1][bj] - pre[bi][j - 1] == 0){
                mpt[i][j] = 1;
            }
        }
    }
    
    
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            mpt[i][j] += mpt[i][j - 1];
        }
    }
    
    for(int j = 1; j <= m; j++){
        for(int i = 1; i <= n; i++){
            mpt[i][j] += mpt[i - 1][j];
        }
    }
    
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            if(mp[i][j] == 0){
                int bi = max(i - w, 0);
                int bj = max(j - h, 0);
                if(mpt[i][j] + mpt[bi][bj] - mpt[bi][j] - mpt[i][bj] == 0){
                    return false;
                }
            }
        }
    }
    
    return true;
}

void solve(){
    cin >> n >> m;
    memset(mp, 0, sizeof(mp));
    memset(pre, 0, sizeof(pre));
    string s;
    for(int i = 1; i <= n; i++){
        cin >> s;
        for(int j = 1; j <= m; j++){
            if(s[j - 1] == '0'){
                mp[i][j] = 1;
            }
        }
    }
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            pre[i][j] = pre[i][j - 1] + mp[i][j];
        }
    }
    
    for(int j = 1; j <= m; j++){
        for(int i = 1; i <= n; i++){
            pre[i][j] += pre[i - 1][j];
        }
    }
    
    int mx = 0;
    for(int i = 1; i <= n; i++){
        int l = 1, r = m;
        while(l <= r){
            int mid = (l + r)/2;
            if(bisa(i, mid)){
                l = mid + 1;
            }else{
                r = mid - 1;
            }
        }
        mx = max(mx, i*r);
    }
    cout << mx << endl;
    
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int t = 1;
    while(t--){
        solve();
    }

    return 0;
}

Compilation message

bomb.cpp: In function 'bool bisa(int, int)':
bomb.cpp:20:9: warning: unused variable 'sz' [-Wunused-variable]
   20 |     int sz = w*h;
      |         ^~

Subtask #1
32.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 70996 KB Output is correct
2 Correct 34 ms 70932 KB Output is correct
3 Correct 77 ms 71012 KB Output is correct
4 Correct 69 ms 71012 KB Output is correct
5 Correct 26 ms 70972 KB Output is correct
6 Correct 25 ms 70996 KB Output is correct
7 Correct 26 ms 70916 KB Output is correct
8 Correct 26 ms 70972 KB Output is correct
9 Correct 26 ms 70896 KB Output is correct
10 Correct 26 ms 70916 KB Output is correct
11 Correct 26 ms 70972 KB Output is correct
12 Correct 26 ms 70860 KB Output is correct
13 Correct 25 ms 70984 KB Output is correct
14 Correct 25 ms 70872 KB Output is correct
15 Correct 25 ms 70968 KB Output is correct
16 Correct 26 ms 70904 KB Output is correct
17 Correct 33 ms 70992 KB Output is correct
18 Correct 31 ms 70988 KB Output is correct
19 Correct 43 ms 71020 KB Output is correct
20 Correct 44 ms 70944 KB Output is correct
21 Correct 33 ms 70996 KB Output is correct
22 Correct 39 ms 71024 KB Output is correct
23 Correct 54 ms 70996 KB Output is correct
24 Correct 38 ms 71012 KB Output is correct
25 Correct 54 ms 71040 KB Output is correct
26 Correct 52 ms 71048 KB Output is correct
27 Correct 878 ms 71380 KB Output is correct
28 Execution timed out 1078 ms 71500 KB Time limit exceeded
29 Execution timed out 1075 ms 71576 KB Time limit exceeded
30 Execution timed out 1084 ms 71892 KB Time limit exceeded
31 Execution timed out 1082 ms 71628 KB Time limit exceeded
32 Execution timed out 1084 ms 71740 KB Time limit exceeded
33 Execution timed out 1082 ms 71928 KB Time limit exceeded
34 Correct 936 ms 71396 KB Output is correct
35 Execution timed out 1084 ms 71920 KB Time limit exceeded
36 Execution timed out 1079 ms 71884 KB Time limit exceeded
37 Correct 27 ms 70860 KB Output is correct
38 Execution timed out 1060 ms 101568 KB Time limit exceeded
39 Correct 28 ms 70876 KB Output is correct
40 Execution timed out 1084 ms 74700 KB Time limit exceeded
41 Correct 29 ms 70928 KB Output is correct
42 Correct 56 ms 71036 KB Output is correct
43 Execution timed out 1062 ms 101564 KB Time limit exceeded
44 Execution timed out 1085 ms 71932 KB Time limit exceeded
45 Execution timed out 1050 ms 101580 KB Time limit exceeded
46 Execution timed out 1054 ms 101564 KB Time limit exceeded
47 Execution timed out 1051 ms 101592 KB Time limit exceeded
48 Execution timed out 1062 ms 101568 KB Time limit exceeded
49 Execution timed out 1071 ms 101680 KB Time limit exceeded
50 Execution timed out 1045 ms 101576 KB Time limit exceeded
51 Execution timed out 1032 ms 101560 KB Time limit exceeded
52 Execution timed out 1061 ms 101556 KB Time limit exceeded
53 Execution timed out 1055 ms 101496 KB Time limit exceeded
54 Execution timed out 1016 ms 101580 KB Time limit exceeded
55 Execution timed out 1040 ms 101564 KB Time limit exceeded
56 Execution timed out 1055 ms 101572 KB Time limit exceeded
57 Execution timed out 1047 ms 101556 KB Time limit exceeded
58 Execution timed out 1064 ms 101580 KB Time limit exceeded
59 Execution timed out 1062 ms 101584 KB Time limit exceeded
60 Execution timed out 1053 ms 101580 KB Time limit exceeded
61 Execution timed out 1051 ms 101572 KB Time limit exceeded
62 Execution timed out 1046 ms 101552 KB Time limit exceeded
63 Execution timed out 1073 ms 101572 KB Time limit exceeded
64 Execution timed out 1056 ms 101600 KB Time limit exceeded
65 Execution timed out 1056 ms 101580 KB Time limit exceeded
66 Execution timed out 1060 ms 101580 KB Time limit exceeded
67 Execution timed out 1054 ms 101480 KB Time limit exceeded
68 Execution timed out 1051 ms 101568 KB Time limit exceeded
69 Execution timed out 1050 ms 101652 KB Time limit exceeded
70 Execution timed out 1059 ms 90568 KB Time limit exceeded
71 Execution timed out 1064 ms 101564 KB Time limit exceeded
72 Execution timed out 1052 ms 101580 KB Time limit exceeded
73 Execution timed out 1064 ms 101576 KB Time limit exceeded
74 Execution timed out 1100 ms 101568 KB Time limit exceeded
75 Execution timed out 1057 ms 101568 KB Time limit exceeded
76 Execution timed out 1049 ms 101460 KB Time limit exceeded
77 Execution timed out 1060 ms 101492 KB Time limit exceeded
78 Execution timed out 1027 ms 101576 KB Time limit exceeded
79 Execution timed out 1051 ms 101556 KB Time limit exceeded
80 Execution timed out 1054 ms 101568 KB Time limit exceeded
81 Execution timed out 1052 ms 101580 KB Time limit exceeded
82 Execution timed out 1055 ms 101556 KB Time limit exceeded
83 Execution timed out 1048 ms 101580 KB Time limit exceeded
84 Execution timed out 1057 ms 101576 KB Time limit exceeded
85 Execution timed out 1053 ms 101580 KB Time limit exceeded
86 Execution timed out 1057 ms 101560 KB Time limit exceeded
87 Execution timed out 1065 ms 101560 KB Time limit exceeded
88 Execution timed out 1034 ms 101556 KB Time limit exceeded
89 Execution timed out 1053 ms 101576 KB Time limit exceeded
90 Execution timed out 1063 ms 90524 KB Time limit exceeded
91 Execution timed out 1061 ms 101560 KB Time limit exceeded
92 Execution timed out 1052 ms 101584 KB Time limit exceeded
93 Execution timed out 1054 ms 101556 KB Time limit exceeded
94 Execution timed out 1016 ms 101504 KB Time limit exceeded
95 Execution timed out 1067 ms 101580 KB Time limit exceeded
96 Execution timed out 1058 ms 101472 KB Time limit exceeded
97 Execution timed out 1057 ms 101576 KB Time limit exceeded
98 Execution timed out 1044 ms 101580 KB Time limit exceeded
99 Execution timed out 1058 ms 101516 KB Time limit exceeded
100 Execution timed out 1047 ms 101676 KB Time limit exceeded