oj.uz

Submission #836335

# Submission time Handle Problem Language Result Execution time Memory
836335 2023-08-24T10:20:51 Z vjudge1 Bomb (IZhO17_bomb) C++17
41 / 100
 1000 ms 100044 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;
    int mw = n, cw = 0, mh = m, ch = 0;
    for(int i = 1; i <= n; i++){
        cin >> s;
        ch = 0;
        for(int j = 1; j <= m; j++){
            if(s[j - 1] == '0'){
                mp[i][j] = 1;
                if(ch != 0){
                    mh = min(mh, ch);
                }
                ch = 0;
            }else{
                ch++;
            }
        }
        if(ch != 0){
            mh = min(mh, ch);
        }
    }
    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++){
        cw = 0;
        for(int i = 1; i <= n; i++){
            pre[i][j] += pre[i - 1][j];
            if(mp[i][j] == 0){
                cw++;
            }else{
                if(cw != 0){
                    mw = min(mw, cw);
                }
                cw = 0;
            }
        }
        if(cw != 0){
            mw = min(mw, cw);
        }
    }
    int mx = 1;
    for(int i = 1; i <= mw; i++){
        int l = ceil((double)mx/i), r = mh;
        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:22:9: warning: unused variable 'sz' [-Wunused-variable]
   22 |     int sz = w*h;
      |         ^~

Subtask #1
41.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 70996 KB Output is correct
2 Correct 24 ms 70980 KB Output is correct
3 Correct 26 ms 70884 KB Output is correct
4 Correct 29 ms 70904 KB Output is correct
5 Correct 26 ms 70956 KB Output is correct
6 Correct 25 ms 70932 KB Output is correct
7 Correct 25 ms 70892 KB Output is correct
8 Correct 25 ms 70956 KB Output is correct
9 Correct 24 ms 70988 KB Output is correct
10 Correct 24 ms 70940 KB Output is correct
11 Correct 24 ms 70996 KB Output is correct
12 Correct 23 ms 70920 KB Output is correct
13 Correct 25 ms 70864 KB Output is correct
14 Correct 25 ms 70996 KB Output is correct
15 Correct 25 ms 70988 KB Output is correct
16 Correct 24 ms 70924 KB Output is correct
17 Correct 24 ms 71012 KB Output is correct
18 Correct 24 ms 70968 KB Output is correct
19 Correct 30 ms 70988 KB Output is correct
20 Correct 27 ms 71044 KB Output is correct
21 Correct 25 ms 70944 KB Output is correct
22 Correct 25 ms 70996 KB Output is correct
23 Correct 27 ms 70936 KB Output is correct
24 Correct 26 ms 70960 KB Output is correct
25 Correct 28 ms 70996 KB Output is correct
26 Correct 29 ms 71004 KB Output is correct
27 Correct 27 ms 71364 KB Output is correct
28 Correct 31 ms 71452 KB Output is correct
29 Correct 189 ms 71504 KB Output is correct
30 Correct 412 ms 71912 KB Output is correct
31 Correct 224 ms 71636 KB Output is correct
32 Correct 269 ms 71868 KB Output is correct
33 Correct 597 ms 71980 KB Output is correct
34 Correct 31 ms 71276 KB Output is correct
35 Correct 96 ms 71972 KB Output is correct
36 Correct 159 ms 71884 KB Output is correct
37 Correct 25 ms 70860 KB Output is correct
38 Execution timed out 1079 ms 99900 KB Time limit exceeded
39 Correct 27 ms 70888 KB Output is correct
40 Execution timed out 1081 ms 74752 KB Time limit exceeded
41 Correct 25 ms 70996 KB Output is correct
42 Correct 32 ms 70956 KB Output is correct
43 Execution timed out 1058 ms 99892 KB Time limit exceeded
44 Correct 987 ms 71980 KB Output is correct
45 Execution timed out 1056 ms 99892 KB Time limit exceeded
46 Execution timed out 1100 ms 99864 KB Time limit exceeded
47 Execution timed out 1046 ms 99908 KB Time limit exceeded
48 Execution timed out 1012 ms 99924 KB Time limit exceeded
49 Execution timed out 1008 ms 99956 KB Time limit exceeded
50 Execution timed out 1039 ms 99916 KB Time limit exceeded
51 Execution timed out 1012 ms 100044 KB Time limit exceeded
52 Execution timed out 1045 ms 99900 KB Time limit exceeded
53 Execution timed out 1037 ms 99920 KB Time limit exceeded
54 Execution timed out 1057 ms 99952 KB Time limit exceeded
55 Execution timed out 1072 ms 99916 KB Time limit exceeded
56 Execution timed out 1040 ms 99920 KB Time limit exceeded
57 Execution timed out 1040 ms 99916 KB Time limit exceeded
58 Execution timed out 1060 ms 99920 KB Time limit exceeded
59 Execution timed out 1043 ms 99920 KB Time limit exceeded
60 Execution timed out 1030 ms 99920 KB Time limit exceeded
61 Execution timed out 1050 ms 99936 KB Time limit exceeded
62 Execution timed out 1060 ms 99920 KB Time limit exceeded
63 Execution timed out 1070 ms 99856 KB Time limit exceeded
64 Execution timed out 1053 ms 99920 KB Time limit exceeded
65 Execution timed out 1051 ms 99920 KB Time limit exceeded
66 Execution timed out 1024 ms 99920 KB Time limit exceeded
67 Execution timed out 1053 ms 99920 KB Time limit exceeded
68 Execution timed out 1051 ms 99924 KB Time limit exceeded
69 Execution timed out 1096 ms 99852 KB Time limit exceeded
70 Execution timed out 1051 ms 90512 KB Time limit exceeded
71 Execution timed out 1025 ms 99920 KB Time limit exceeded
72 Execution timed out 1093 ms 99920 KB Time limit exceeded
73 Execution timed out 1018 ms 99944 KB Time limit exceeded
74 Execution timed out 1046 ms 99916 KB Time limit exceeded
75 Execution timed out 1049 ms 99832 KB Time limit exceeded
76 Execution timed out 1044 ms 99844 KB Time limit exceeded
77 Execution timed out 1078 ms 99920 KB Time limit exceeded
78 Execution timed out 1043 ms 99932 KB Time limit exceeded
79 Execution timed out 1056 ms 99916 KB Time limit exceeded
80 Execution timed out 1045 ms 99920 KB Time limit exceeded
81 Execution timed out 1106 ms 99884 KB Time limit exceeded
82 Execution timed out 1051 ms 99916 KB Time limit exceeded
83 Execution timed out 1060 ms 99928 KB Time limit exceeded
84 Execution timed out 1036 ms 99912 KB Time limit exceeded
85 Execution timed out 1018 ms 99916 KB Time limit exceeded
86 Execution timed out 1049 ms 99916 KB Time limit exceeded
87 Execution timed out 1010 ms 99924 KB Time limit exceeded
88 Execution timed out 1052 ms 99916 KB Time limit exceeded
89 Execution timed out 1057 ms 99844 KB Time limit exceeded
90 Execution timed out 1045 ms 90556 KB Time limit exceeded
91 Execution timed out 1010 ms 99932 KB Time limit exceeded
92 Execution timed out 1037 ms 99896 KB Time limit exceeded
93 Execution timed out 1055 ms 100032 KB Time limit exceeded
94 Execution timed out 1056 ms 99912 KB Time limit exceeded
95 Execution timed out 1037 ms 99920 KB Time limit exceeded
96 Execution timed out 1054 ms 99948 KB Time limit exceeded
97 Execution timed out 1050 ms 99908 KB Time limit exceeded
98 Execution timed out 1068 ms 99860 KB Time limit exceeded
99 Execution timed out 1061 ms 99932 KB Time limit exceeded
100 Execution timed out 1038 ms 99976 KB Time limit exceeded