oj.uz

Submission #170982

# Submission time Handle Problem Language Result Execution time Memory
170982 2019-12-26T21:45:09 Z davitmarg Bomb (IZhO17_bomb) C++17
100 / 100
 843 ms 74116 KB 
/*DavitMarg*/
#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <cstring>
#include <map>
#include <unordered_map>
#include <set>
#include <queue>
#include <iomanip>
#include <bitset>
#include <stack>
#include <cassert>
#include <iterator>
#include <fstream>
#define mod 1000000007ll
#define LL long long
#define LD long double
#define MP make_pair
#define PB push_back
#define all(v) v.begin(), v.end()
using namespace std;

const int N = 2505;

int n, m, a[N][N], nxt[N][N], lst[N][N], d[N], Y, X, ans;

int main()
{
    cin >> n >> m;

    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
        {
            char x;
            scanf(" %c", &x);
            a[i][j] += (x - '0');
        }
    X = m;
    Y = n;
    for (int i = 1; i <= n; i++)
    {
        for (int j = m; j >= 1; j--)
        {
            if (a[i][j])
            {
                nxt[i][j] = nxt[i][j + 1] + 1;
                if (a[i][j - 1] == 0)
                    X = min(nxt[i][j], X);
            }
            else
                nxt[i][j] = 0;
        }

        for (int j = 1; j <= m; j++)
            if (a[i][j])
                lst[i][j] = lst[i][j - 1] + 1;
            else
                lst[i][j] = 0;
    }

    for (int i = 1; i <= Y; i++)
        d[i] = X;

    for (int j = 1; j <= m; j++)
    {
        int y = 0, l = X, r = X;
        for (int i = 1; i <= n; i++)
        {
            if (a[i][j] == 0)
            {
                y = 0;
                l = r = X;
            }
            else
            {
                y++;
                r = min(r, nxt[i][j]);
                l = min(l, lst[i][j]);
                d[y] = min(l + r - 1, d[y]);
            }
            //cout << i << " : " << j << " = " << y << " : " << x << endl;
        }

        y = 0;
        l = X;
        r = X;
        for (int i = n; i >= 1; i--)
        {

            if (a[i][j] == 0)
            {
                y = 0;
                l = r = X;
            }
            else
            {
                y++;
                if (a[i - 1][j] == 0)
                    Y = min(y, Y);
                r = min(r, nxt[i][j]);
                l = min(l, lst[i][j]);
                d[y] = min(l + r - 1, d[y]);
            }
            //cout << i << " : " << j << " = " << y << " : " << x << endl;
        }
    }

    for (int i = 1; i <= Y; i++)
    {
        //d[i + 1] = min(d[i + 1], d[i]);
        //cout << i << " : " << d[i] << endl;
        ans = max(ans, i * d[i]);
    }

    cout << ans << endl;
    return 0;
}

/*

4 3
110
111
111
011

5 6
100000
111110
111110
111110
100000

6 5
00110
01110
11110
11011
11111
11111


9 9
000000000
000111000
000111000
011111110
011101110
011111110
000111000
000111000
000000000
 
9 9
000000000
000111000
000111000
011111110
011101110
011111110
000111000
000111000
000000000

6 6
000111
000111
001111
111100
111000
111000

6 6
000000
111000
111100
001111
000111
000111

6 6
000111
011111
011111
111000
111000
111000
 
*/

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:38:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf(" %c", &x);
             ~~~~~^~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 636 KB Output is correct
3 Correct 33 ms 30412 KB Output is correct
4 Correct 33 ms 30456 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 632 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 504 KB Output is correct
12 Correct 2 ms 504 KB Output is correct
13 Correct 2 ms 504 KB Output is correct
14 Correct 2 ms 504 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 504 KB Output is correct
17 Correct 3 ms 1144 KB Output is correct
18 Correct 3 ms 1272 KB Output is correct
19 Correct 3 ms 1532 KB Output is correct
20 Correct 3 ms 1528 KB Output is correct
21 Correct 3 ms 1016 KB Output is correct
22 Correct 3 ms 1400 KB Output is correct
23 Correct 3 ms 1656 KB Output is correct
24 Correct 3 ms 1400 KB Output is correct
25 Correct 3 ms 1656 KB Output is correct
26 Correct 4 ms 1784 KB Output is correct
27 Correct 11 ms 4856 KB Output is correct
28 Correct 12 ms 5112 KB Output is correct
29 Correct 16 ms 6520 KB Output is correct
30 Correct 20 ms 7672 KB Output is correct
31 Correct 16 ms 6136 KB Output is correct
32 Correct 17 ms 7032 KB Output is correct
33 Correct 21 ms 8056 KB Output is correct
34 Correct 10 ms 5624 KB Output is correct
35 Correct 20 ms 8056 KB Output is correct
36 Correct 24 ms 8056 KB Output is correct
37 Correct 2 ms 632 KB Output is correct
38 Correct 833 ms 74104 KB Output is correct
39 Correct 2 ms 636 KB Output is correct
40 Correct 96 ms 19960 KB Output is correct
41 Correct 2 ms 632 KB Output is correct
42 Correct 4 ms 1656 KB Output is correct
43 Correct 722 ms 73968 KB Output is correct
44 Correct 22 ms 8188 KB Output is correct
45 Correct 708 ms 73976 KB Output is correct
46 Correct 670 ms 74004 KB Output is correct
47 Correct 715 ms 73948 KB Output is correct
48 Correct 690 ms 74004 KB Output is correct
49 Correct 833 ms 73948 KB Output is correct
50 Correct 700 ms 74104 KB Output is correct
51 Correct 694 ms 74104 KB Output is correct
52 Correct 690 ms 73976 KB Output is correct
53 Correct 687 ms 73860 KB Output is correct
54 Correct 601 ms 73848 KB Output is correct
55 Correct 600 ms 74012 KB Output is correct
56 Correct 824 ms 73976 KB Output is correct
57 Correct 593 ms 73976 KB Output is correct
58 Correct 594 ms 74116 KB Output is correct
59 Correct 589 ms 73848 KB Output is correct
60 Correct 671 ms 73848 KB Output is correct
61 Correct 843 ms 73980 KB Output is correct
62 Correct 837 ms 74040 KB Output is correct
63 Correct 838 ms 74104 KB Output is correct
64 Correct 593 ms 73980 KB Output is correct
65 Correct 677 ms 74032 KB Output is correct
66 Correct 684 ms 74104 KB Output is correct
67 Correct 714 ms 73872 KB Output is correct
68 Correct 733 ms 73940 KB Output is correct
69 Correct 603 ms 74064 KB Output is correct
70 Correct 335 ms 59160 KB Output is correct
71 Correct 556 ms 73976 KB Output is correct
72 Correct 582 ms 73980 KB Output is correct
73 Correct 589 ms 73880 KB Output is correct
74 Correct 590 ms 74084 KB Output is correct
75 Correct 600 ms 74080 KB Output is correct
76 Correct 636 ms 74012 KB Output is correct
77 Correct 611 ms 73944 KB Output is correct
78 Correct 605 ms 73976 KB Output is correct
79 Correct 490 ms 74008 KB Output is correct
80 Correct 491 ms 73980 KB Output is correct
81 Correct 519 ms 74000 KB Output is correct
82 Correct 611 ms 73976 KB Output is correct
83 Correct 605 ms 73848 KB Output is correct
84 Correct 485 ms 73852 KB Output is correct
85 Correct 593 ms 73976 KB Output is correct
86 Correct 803 ms 73924 KB Output is correct
87 Correct 588 ms 73848 KB Output is correct
88 Correct 605 ms 73976 KB Output is correct
89 Correct 658 ms 73976 KB Output is correct
90 Correct 368 ms 59128 KB Output is correct
91 Correct 618 ms 74084 KB Output is correct
92 Correct 676 ms 73976 KB Output is correct
93 Correct 796 ms 73976 KB Output is correct
94 Correct 682 ms 73900 KB Output is correct
95 Correct 620 ms 74032 KB Output is correct
96 Correct 610 ms 74104 KB Output is correct
97 Correct 799 ms 73976 KB Output is correct
98 Correct 621 ms 73984 KB Output is correct
99 Correct 660 ms 73916 KB Output is correct
100 Correct 800 ms 74060 KB Output is correct