oj.uz

Submission #835946

# Submission time Handle Problem Language Result Execution time Memory
835946 2023-08-24T00:17:36 Z vjudge1 Bomb (IZhO17_bomb) C++17
40 / 100
 1000 ms 95564 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;
    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:20:9: warning: unused variable 'sz' [-Wunused-variable]
   20 |     int sz = w*h;
      |         ^~

Subtask #1
40.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 70996 KB Output is correct
2 Correct 23 ms 70996 KB Output is correct
3 Correct 27 ms 70996 KB Output is correct
4 Correct 27 ms 70904 KB Output is correct
5 Correct 25 ms 70996 KB Output is correct
6 Correct 26 ms 70988 KB Output is correct
7 Correct 24 ms 70996 KB Output is correct
8 Correct 25 ms 70988 KB Output is correct
9 Correct 23 ms 70996 KB Output is correct
10 Correct 24 ms 70952 KB Output is correct
11 Correct 23 ms 70996 KB Output is correct
12 Correct 26 ms 70996 KB Output is correct
13 Correct 24 ms 71004 KB Output is correct
14 Correct 23 ms 70996 KB Output is correct
15 Correct 23 ms 70860 KB Output is correct
16 Correct 26 ms 70860 KB Output is correct
17 Correct 23 ms 70996 KB Output is correct
18 Correct 24 ms 70968 KB Output is correct
19 Correct 26 ms 70996 KB Output is correct
20 Correct 32 ms 70996 KB Output is correct
21 Correct 24 ms 70916 KB Output is correct
22 Correct 24 ms 70996 KB Output is correct
23 Correct 31 ms 71016 KB Output is correct
24 Correct 25 ms 70996 KB Output is correct
25 Correct 31 ms 70996 KB Output is correct
26 Correct 25 ms 70996 KB Output is correct
27 Correct 26 ms 71252 KB Output is correct
28 Correct 36 ms 71448 KB Output is correct
29 Correct 245 ms 71472 KB Output is correct
30 Correct 706 ms 71720 KB Output is correct
31 Correct 384 ms 71632 KB Output is correct
32 Correct 464 ms 71596 KB Output is correct
33 Execution timed out 1012 ms 71776 KB Time limit exceeded
34 Correct 36 ms 71252 KB Output is correct
35 Correct 163 ms 71764 KB Output is correct
36 Correct 150 ms 71784 KB Output is correct
37 Correct 24 ms 70996 KB Output is correct
38 Execution timed out 1088 ms 95340 KB Time limit exceeded
39 Correct 25 ms 70996 KB Output is correct
40 Execution timed out 1057 ms 73940 KB Time limit exceeded
41 Correct 25 ms 70860 KB Output is correct
42 Correct 35 ms 70988 KB Output is correct
43 Execution timed out 1090 ms 95500 KB Time limit exceeded
44 Execution timed out 1058 ms 71756 KB Time limit exceeded
45 Execution timed out 1062 ms 95512 KB Time limit exceeded
46 Execution timed out 1060 ms 95444 KB Time limit exceeded
47 Execution timed out 1042 ms 95440 KB Time limit exceeded
48 Execution timed out 1062 ms 95436 KB Time limit exceeded
49 Correct 940 ms 95472 KB Output is correct
50 Execution timed out 1059 ms 95564 KB Time limit exceeded
51 Execution timed out 1064 ms 95436 KB Time limit exceeded
52 Execution timed out 1074 ms 95436 KB Time limit exceeded
53 Execution timed out 1068 ms 95428 KB Time limit exceeded
54 Execution timed out 1076 ms 95436 KB Time limit exceeded
55 Execution timed out 1039 ms 95436 KB Time limit exceeded
56 Execution timed out 1071 ms 95444 KB Time limit exceeded
57 Execution timed out 1045 ms 95436 KB Time limit exceeded
58 Execution timed out 1065 ms 95440 KB Time limit exceeded
59 Execution timed out 1070 ms 95436 KB Time limit exceeded
60 Execution timed out 1050 ms 95436 KB Time limit exceeded
61 Execution timed out 1055 ms 95440 KB Time limit exceeded
62 Execution timed out 1048 ms 95436 KB Time limit exceeded
63 Execution timed out 1068 ms 95436 KB Time limit exceeded
64 Execution timed out 1056 ms 95440 KB Time limit exceeded
65 Execution timed out 1067 ms 95436 KB Time limit exceeded
66 Execution timed out 1064 ms 95440 KB Time limit exceeded
67 Execution timed out 1060 ms 95564 KB Time limit exceeded
68 Execution timed out 1073 ms 95436 KB Time limit exceeded
69 Execution timed out 1070 ms 95436 KB Time limit exceeded
70 Execution timed out 1072 ms 86604 KB Time limit exceeded
71 Execution timed out 1059 ms 95444 KB Time limit exceeded
72 Execution timed out 1042 ms 95564 KB Time limit exceeded
73 Execution timed out 1049 ms 95436 KB Time limit exceeded
74 Execution timed out 1080 ms 95436 KB Time limit exceeded
75 Execution timed out 1051 ms 95440 KB Time limit exceeded
76 Execution timed out 1047 ms 95464 KB Time limit exceeded
77 Execution timed out 1053 ms 95356 KB Time limit exceeded
78 Execution timed out 1058 ms 95436 KB Time limit exceeded
79 Execution timed out 1079 ms 95444 KB Time limit exceeded
80 Execution timed out 1073 ms 95440 KB Time limit exceeded
81 Execution timed out 1066 ms 95436 KB Time limit exceeded
82 Execution timed out 1061 ms 95436 KB Time limit exceeded
83 Execution timed out 1072 ms 95436 KB Time limit exceeded
84 Execution timed out 1050 ms 95564 KB Time limit exceeded
85 Execution timed out 1067 ms 95436 KB Time limit exceeded
86 Execution timed out 1069 ms 95436 KB Time limit exceeded
87 Execution timed out 1056 ms 95444 KB Time limit exceeded
88 Execution timed out 1053 ms 95444 KB Time limit exceeded
89 Execution timed out 1058 ms 95440 KB Time limit exceeded
90 Execution timed out 1072 ms 86604 KB Time limit exceeded
91 Execution timed out 1068 ms 95432 KB Time limit exceeded
92 Execution timed out 1052 ms 95444 KB Time limit exceeded
93 Execution timed out 1052 ms 95436 KB Time limit exceeded
94 Execution timed out 1077 ms 95440 KB Time limit exceeded
95 Execution timed out 1045 ms 95436 KB Time limit exceeded
96 Execution timed out 1057 ms 95440 KB Time limit exceeded
97 Execution timed out 1068 ms 95436 KB Time limit exceeded
98 Execution timed out 1059 ms 95436 KB Time limit exceeded
99 Execution timed out 1056 ms 95564 KB Time limit exceeded
100 Execution timed out 1061 ms 95404 KB Time limit exceeded