oj.uz

Submission #835947

# Submission time Handle Problem Language Result Execution time Memory
835947 2023-08-24T00:23:22 Z vjudge1 Bomb (IZhO17_bomb) C++17
33 / 100
 1000 ms 95468 KB 
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#include <bits/stdc++.h>

using namespace std;

#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,tune=native")


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:23:9: warning: unused variable 'sz' [-Wunused-variable]
   23 |     int sz = w*h;
      |         ^~

Subtask #1
33.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 70996 KB Output is correct
2 Correct 23 ms 70928 KB Output is correct
3 Correct 75 ms 70992 KB Output is correct
4 Correct 61 ms 71004 KB Output is correct
5 Correct 24 ms 70996 KB Output is correct
6 Correct 24 ms 70996 KB Output is correct
7 Correct 25 ms 70956 KB Output is correct
8 Correct 25 ms 70992 KB Output is correct
9 Correct 25 ms 70876 KB Output is correct
10 Correct 25 ms 70916 KB Output is correct
11 Correct 25 ms 71008 KB Output is correct
12 Correct 24 ms 70928 KB Output is correct
13 Correct 24 ms 70896 KB Output is correct
14 Correct 23 ms 70944 KB Output is correct
15 Correct 24 ms 70948 KB Output is correct
16 Correct 25 ms 70900 KB Output is correct
17 Correct 27 ms 71000 KB Output is correct
18 Correct 27 ms 70944 KB Output is correct
19 Correct 34 ms 71020 KB Output is correct
20 Correct 37 ms 71156 KB Output is correct
21 Correct 28 ms 70996 KB Output is correct
22 Correct 32 ms 70996 KB Output is correct
23 Correct 41 ms 70988 KB Output is correct
24 Correct 31 ms 71028 KB Output is correct
25 Correct 42 ms 70952 KB Output is correct
26 Correct 42 ms 71040 KB Output is correct
27 Correct 465 ms 71300 KB Output is correct
28 Correct 614 ms 71380 KB Output is correct
29 Execution timed out 1090 ms 71380 KB Time limit exceeded
30 Execution timed out 1047 ms 71636 KB Time limit exceeded
31 Execution timed out 1012 ms 71576 KB Time limit exceeded
32 Execution timed out 1087 ms 71500 KB Time limit exceeded
33 Execution timed out 1082 ms 71704 KB Time limit exceeded
34 Correct 490 ms 71304 KB Output is correct
35 Execution timed out 1086 ms 71716 KB Time limit exceeded
36 Execution timed out 1081 ms 71704 KB Time limit exceeded
37 Correct 25 ms 70996 KB Output is correct
38 Execution timed out 1074 ms 95452 KB Time limit exceeded
39 Correct 25 ms 70996 KB Output is correct
40 Execution timed out 1076 ms 74012 KB Time limit exceeded
41 Correct 28 ms 70996 KB Output is correct
42 Correct 46 ms 71020 KB Output is correct
43 Execution timed out 1091 ms 95456 KB Time limit exceeded
44 Execution timed out 1090 ms 71764 KB Time limit exceeded
45 Execution timed out 1093 ms 95360 KB Time limit exceeded
46 Execution timed out 1089 ms 95404 KB Time limit exceeded
47 Execution timed out 1075 ms 95436 KB Time limit exceeded
48 Execution timed out 1091 ms 95436 KB Time limit exceeded
49 Execution timed out 1090 ms 95468 KB Time limit exceeded
50 Execution timed out 1064 ms 95452 KB Time limit exceeded
51 Execution timed out 1080 ms 95432 KB Time limit exceeded
52 Execution timed out 1091 ms 95436 KB Time limit exceeded
53 Execution timed out 1088 ms 95428 KB Time limit exceeded
54 Execution timed out 1092 ms 95440 KB Time limit exceeded
55 Execution timed out 1086 ms 95448 KB Time limit exceeded
56 Execution timed out 1093 ms 95464 KB Time limit exceeded
57 Execution timed out 1072 ms 95400 KB Time limit exceeded
58 Execution timed out 1072 ms 95408 KB Time limit exceeded
59 Execution timed out 1087 ms 95464 KB Time limit exceeded
60 Execution timed out 1082 ms 95448 KB Time limit exceeded
61 Execution timed out 1040 ms 95436 KB Time limit exceeded
62 Execution timed out 1083 ms 95396 KB Time limit exceeded
63 Execution timed out 1085 ms 95452 KB Time limit exceeded
64 Execution timed out 1078 ms 95452 KB Time limit exceeded
65 Execution timed out 1081 ms 95456 KB Time limit exceeded
66 Execution timed out 1088 ms 95436 KB Time limit exceeded
67 Execution timed out 1085 ms 95448 KB Time limit exceeded
68 Execution timed out 1087 ms 95416 KB Time limit exceeded
69 Execution timed out 1075 ms 95444 KB Time limit exceeded
70 Execution timed out 1086 ms 86600 KB Time limit exceeded
71 Execution timed out 1077 ms 95436 KB Time limit exceeded
72 Execution timed out 1092 ms 95400 KB Time limit exceeded
73 Execution timed out 1078 ms 95412 KB Time limit exceeded
74 Execution timed out 1095 ms 95456 KB Time limit exceeded
75 Execution timed out 1081 ms 95396 KB Time limit exceeded
76 Execution timed out 1083 ms 95448 KB Time limit exceeded
77 Execution timed out 1075 ms 95440 KB Time limit exceeded
78 Execution timed out 1076 ms 95436 KB Time limit exceeded
79 Execution timed out 1090 ms 95436 KB Time limit exceeded
80 Execution timed out 1085 ms 95456 KB Time limit exceeded
81 Execution timed out 1076 ms 95436 KB Time limit exceeded
82 Execution timed out 1093 ms 95436 KB Time limit exceeded
83 Execution timed out 1086 ms 95436 KB Time limit exceeded
84 Execution timed out 1083 ms 95436 KB Time limit exceeded
85 Execution timed out 1082 ms 95436 KB Time limit exceeded
86 Execution timed out 1092 ms 95448 KB Time limit exceeded
87 Execution timed out 1073 ms 95396 KB Time limit exceeded
88 Execution timed out 1095 ms 95444 KB Time limit exceeded
89 Execution timed out 1089 ms 95400 KB Time limit exceeded
90 Execution timed out 1077 ms 86668 KB Time limit exceeded
91 Execution timed out 1093 ms 95428 KB Time limit exceeded
92 Execution timed out 1095 ms 95436 KB Time limit exceeded
93 Execution timed out 1084 ms 95440 KB Time limit exceeded
94 Execution timed out 1095 ms 95452 KB Time limit exceeded
95 Execution timed out 1098 ms 95436 KB Time limit exceeded
96 Execution timed out 1096 ms 95452 KB Time limit exceeded
97 Execution timed out 1087 ms 95444 KB Time limit exceeded
98 Execution timed out 1086 ms 95436 KB Time limit exceeded
99 Execution timed out 1052 ms 95436 KB Time limit exceeded
100 Execution timed out 1085 ms 95356 KB Time limit exceeded