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Submission #1030383

# Submission time Handle Problem Language Result Execution time Memory
1030383 2024-07-22T04:15:38 Z caterpillow Bomb (IZhO17_bomb) C++17
33 / 100
 1000 ms 56988 KB 
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
#define vt vector
#define f first
#define s second
#define all(x) (x).begin(), (x).end()
#define FOR(i, a, b)  for (int i = (a); i < (b); i++)
#define F0R(i, b) FOR(i, 0, b)
#define ROF(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define pb push_back
#define endl '\n'

#ifndef LOCAL
#define cerr if (0) std::cerr
#endif

/*

N^3: find max width for each given height

*/

int rs, cs;
vt<vt<bool>> grid;
vt<vt<int>> sfx;

int sum(int r1, int c1, int r2, int c2) {
    r2 = min(r2, rs - 1);
    c2 = min(c2, cs - 1);
    return sfx[r1][c1] - sfx[r1][c2 + 1] - sfx[r2 + 1][c1] + sfx[r2 + 1][c2 + 1];
}

main() {
    cin.tie(0)->sync_with_stdio();

    cin >> rs >> cs;
    rs += 2, cs += 2;
    grid.resize(rs, vt<bool>(cs));
    sfx.resize(rs + 1, vt<int>(cs + 1));
    FOR (r, 1, rs - 1) {
        FOR (c, 1, cs - 1) {
            char ch; cin >> ch;
            grid[r][c] = sfx[r][c] = ch - '0';
        }
    }
    ROF (r, 0, rs) ROF (c, 0, cs) sfx[r][c] += sfx[r][c + 1];
    ROF (r, 0, rs) ROF (c, 0, cs) sfx[r][c] += sfx[r + 1][c];

    int mxw = cs, mxh = rs;
    F0R (r, rs) {
        int streak = 0;
        F0R (c, cs) {
            if (grid[r][c]) streak++;
            else if (streak) mxw = min(mxw, streak), streak = 0;
        }
    }
    F0R (c, cs) {
        int streak = 0;
        F0R (r, rs) {
            if (grid[r][c]) streak++;
            else if (streak) mxh = min(mxh, streak), streak = 0;
        }
    }

    cerr << mxw << " " << mxh << endl;

    int best = 0;
    FOR (h, 1, mxh + 1) {
        FOR (w, 1, mxw + 1) {
            vt<vt<int>> pfx(rs, vt<int>(cs));
            auto is_covered = [&] (int r, int c) {
                return (pfx[r][c] - (r - h >= 0 ? pfx[r - h][c] : 0) - (c - w >= 0 ? pfx[r][c - w] : 0) + (r - h >= 0 && c - w >= 0 ? pfx[r - h][c - w] : 0)) > 0;
            };
            auto add = [&] (int r, int c) {
                pfx[r][c] += (r ? pfx[r - 1][c] : 0) + (c ? pfx[r][c - 1] : 0) - (r && c ? pfx[r - 1][c - 1] : 0);
            };

            cerr << w << " " << h << endl;

            bool good = true;
            F0R (r, rs - 1) {
                F0R (c, cs - 1) {
                    if (sum(r, c, r + h - 1, c + w - 1) == w * h) {
                        pfx[r][c]++;
                    }
                    add(r, c);
                    if (grid[r][c] == 1) {
                        cerr << is_covered(r, c) << endl;
                        good &= is_covered(r, c);
                    }
                }
            }
            if (good) best = max(best, w * h);
        }
    }
    cout << best << endl;
}

Compilation message

bomb.cpp:36:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   36 | main() {
      | ^~~~
bomb.cpp: In function 'int main()':
bomb.cpp:46:36: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   46 |             grid[r][c] = sfx[r][c] = ch - '0';

Subtask #1
33.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 436 KB Output is correct
3 Correct 4 ms 860 KB Output is correct
4 Correct 5 ms 860 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 13 ms 516 KB Output is correct
20 Correct 11 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 2 ms 348 KB Output is correct
23 Correct 33 ms 348 KB Output is correct
24 Correct 14 ms 348 KB Output is correct
25 Correct 68 ms 516 KB Output is correct
26 Correct 7 ms 348 KB Output is correct
27 Correct 3 ms 1180 KB Output is correct
28 Correct 30 ms 1480 KB Output is correct
29 Execution timed out 1055 ms 1596 KB Time limit exceeded
30 Execution timed out 1020 ms 2240 KB Time limit exceeded
31 Execution timed out 1087 ms 2072 KB Time limit exceeded
32 Execution timed out 1010 ms 2112 KB Time limit exceeded
33 Execution timed out 1028 ms 2300 KB Time limit exceeded
34 Correct 36 ms 1468 KB Output is correct
35 Execution timed out 1052 ms 2316 KB Time limit exceeded
36 Execution timed out 1072 ms 2300 KB Time limit exceeded
37 Correct 0 ms 348 KB Output is correct
38 Execution timed out 1098 ms 56700 KB Time limit exceeded
39 Correct 1 ms 344 KB Output is correct
40 Execution timed out 1076 ms 7652 KB Time limit exceeded
41 Correct 1 ms 344 KB Output is correct
42 Correct 109 ms 512 KB Output is correct
43 Execution timed out 1073 ms 56604 KB Time limit exceeded
44 Execution timed out 1043 ms 2320 KB Time limit exceeded
45 Execution timed out 1053 ms 56596 KB Time limit exceeded
46 Execution timed out 1024 ms 56704 KB Time limit exceeded
47 Execution timed out 1038 ms 56700 KB Time limit exceeded
48 Execution timed out 1027 ms 56744 KB Time limit exceeded
49 Execution timed out 1036 ms 56988 KB Time limit exceeded
50 Execution timed out 1044 ms 56780 KB Time limit exceeded
51 Execution timed out 1053 ms 56696 KB Time limit exceeded
52 Execution timed out 1029 ms 56756 KB Time limit exceeded
53 Execution timed out 1022 ms 56740 KB Time limit exceeded
54 Execution timed out 1042 ms 56736 KB Time limit exceeded
55 Execution timed out 1029 ms 56748 KB Time limit exceeded
56 Execution timed out 1056 ms 56960 KB Time limit exceeded
57 Execution timed out 1058 ms 56932 KB Time limit exceeded
58 Execution timed out 1060 ms 56696 KB Time limit exceeded
59 Execution timed out 1044 ms 56984 KB Time limit exceeded
60 Execution timed out 1041 ms 56748 KB Time limit exceeded
61 Execution timed out 1031 ms 56696 KB Time limit exceeded
62 Execution timed out 1025 ms 56696 KB Time limit exceeded
63 Execution timed out 1014 ms 56696 KB Time limit exceeded
64 Execution timed out 1041 ms 56700 KB Time limit exceeded
65 Execution timed out 1061 ms 56804 KB Time limit exceeded
66 Execution timed out 1076 ms 56948 KB Time limit exceeded
67 Execution timed out 1027 ms 56700 KB Time limit exceeded
68 Execution timed out 1012 ms 56696 KB Time limit exceeded
69 Execution timed out 1060 ms 56700 KB Time limit exceeded
70 Execution timed out 1076 ms 36460 KB Time limit exceeded
71 Execution timed out 1067 ms 56720 KB Time limit exceeded
72 Execution timed out 1063 ms 56700 KB Time limit exceeded
73 Execution timed out 1068 ms 56904 KB Time limit exceeded
74 Execution timed out 1037 ms 56696 KB Time limit exceeded
75 Execution timed out 1020 ms 56700 KB Time limit exceeded
76 Execution timed out 1043 ms 56744 KB Time limit exceeded
77 Execution timed out 1077 ms 56752 KB Time limit exceeded
78 Execution timed out 1057 ms 56816 KB Time limit exceeded
79 Execution timed out 1030 ms 56944 KB Time limit exceeded
80 Execution timed out 1069 ms 56576 KB Time limit exceeded
81 Execution timed out 1067 ms 56960 KB Time limit exceeded
82 Execution timed out 1055 ms 56744 KB Time limit exceeded
83 Execution timed out 1057 ms 56944 KB Time limit exceeded
84 Execution timed out 1018 ms 56700 KB Time limit exceeded
85 Execution timed out 1046 ms 56936 KB Time limit exceeded
86 Execution timed out 1041 ms 56704 KB Time limit exceeded
87 Execution timed out 1022 ms 56988 KB Time limit exceeded
88 Execution timed out 1043 ms 56708 KB Time limit exceeded
89 Execution timed out 1071 ms 56952 KB Time limit exceeded
90 Execution timed out 1056 ms 36520 KB Time limit exceeded
91 Execution timed out 1054 ms 56828 KB Time limit exceeded
92 Execution timed out 1051 ms 56824 KB Time limit exceeded
93 Execution timed out 1060 ms 56868 KB Time limit exceeded
94 Execution timed out 1052 ms 56700 KB Time limit exceeded
95 Execution timed out 1028 ms 56696 KB Time limit exceeded
96 Execution timed out 1057 ms 56880 KB Time limit exceeded
97 Execution timed out 1066 ms 56708 KB Time limit exceeded
98 Execution timed out 1044 ms 56696 KB Time limit exceeded
99 Execution timed out 1070 ms 56708 KB Time limit exceeded
100 Execution timed out 1060 ms 56832 KB Time limit exceeded