답안 #835946

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
835946	2023-08-24T00:17:36 Z	vjudge1	Bomb (IZhO17_bomb)	C++17	40 / 100	1000 ms	95564 KB

bomb

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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

#	결과	실행 시간	메모리	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