oj.uz

Submission #831278

# Submission time Handle Problem Language Result Execution time Memory
831278 2023-08-20T03:44:43 Z vjudge1 Bomb (IZhO17_bomb) C++17
90 / 100
 127 ms 55684 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma comment(linker, "/stack:200000000")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//turn on extra precision
//#pragma GCC target("fpmath=387")

using namespace std;
using namespace __gnu_pbds;

using str   = string;
using ll    = long long;
using pii   = pair <int,int>;
using pll   = pair <ll,ll>;
using vi    = vector <int>;
using vll   = vector <ll>;
using vpii  = vector <pii>;
using vpll  = vector <pll>;

template<class A, class B>
ostream& operator<<(ostream& os, const pair<A, B> &p) {
    os << '(' << p.first << ',' << p.second << ')';
    return os;
}

template<class T>
ostream& operator<<(ostream& os, const vector<T> &v) {
    bool van = 1; os << '{';
    for(auto &i : v) { if(!van) os << ", "; os << i; van = 0; }
    os << '}'; return os;
}

template<class T, size_t sz>
ostream& operator<<(ostream&os, const array<T,sz> &arr) {
    bool fs = 1; os << '{';
    for(auto &i : arr) { if(!fs) os << ", "; os << i; fs = 0; }
    os << '}'; return os;
}

#define mp make_pair
#define fi first
#define se second
#define fs first.second
#define ss second.second
#define ff first.first
#define sf second.first
#define newl '\n'
#define all(x) x.begin(), x.end()
#define watch(x) cerr << (#x) << " is : " << (x) << newl

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

template <class T>
ll quickpow(ll num1, ll num2, const T MOD) {
    assert(num2 >= 0); ll ans = 1;
    for(; num2; num2>>=1, num1 = num1 * num1 % MOD) if(num2 & 1) ans = ans * num1 % MOD;
    return ans;
}
// end of Template

int main(){

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, m;
    cin >> n >> m;

    vector<vector<char>> grid(n, vector<char>(m));
    for(int i = 0; i < n; ++i) {
        for(int j = 0; j < m; ++j) {
            cin >> grid[i][j];
        }
    }

    vector<vector<int>> up(n, vector<int>(m)), dw(n, vector<int>(m));
    for(int i = 0; i < n; ++i) {
        for(int j = 0; j < m; ++j) {
            if(grid[i][j] == '0') continue;
            up[i][j] = (i && grid[i-1][j] == '1' ? up[i-1][j] : i-1);
        }
    }

    for(int i = n - 1; i >= 0; --i) {
        for(int j = 0; j < m; ++j) {
            if(grid[i][j] == '0') continue;
            dw[i][j] = (i + 1 < n && grid[i+1][j] == '1' ? dw[i+1][j] : i+1);
        }
    }

    const int INF = 1e9;
    vector<int> ver(m+1, INF);
    int maxh = m;
    for(int i = 0; i < n; ++i) {
        int L = INF;
        for(int j = 0; j < m; ++j) {
            if(grid[i][j] == '0') continue;

            int u = -1, d = INF, le = j - 1;
            int lenmax = 0;
            for(; j < m && grid[i][j] == '1'; ++j) {
                int len = j - le;
                u = max(u, up[i][j]);
                d = min(d, dw[i][j]);
                ver[len] = min(ver[len], d - u - 1);
                lenmax = max(lenmax, len);
            }
            L = min(L, lenmax);
        }
        maxh = min(maxh, L);

        for(int j = m - 1; j >= 0; --j) {
            if(grid[i][j] == '0') continue;

            int u = -1, d = INF, ri = j + 1;
            for(; j >= 0 && grid[i][j] == '1'; --j) {
                int len = ri - j;
                u = max(u, up[i][j]);
                d = min(d, dw[i][j]);
                ver[len] = min(ver[len], d - u - 1);
            }
        }
    }


    int ans = 0;
    for(int i = 1; i <= maxh; ++i) {
        if(ver[i] == INF) continue;
        ans = max(ans, i * ver[i]);
    }
    cout << ans << newl;

    return 0;
}

Compilation message

bomb.cpp:6: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    6 | #pragma GCC optimization ("O3")
      | 
bomb.cpp:7: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    7 | #pragma GCC optimization ("unroll-loops")
      | 
bomb.cpp:8: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    8 | #pragma comment(linker, "/stack:200000000")
      |

Subtask #1
90.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Incorrect 0 ms 212 KB Output isn't correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 0 ms 340 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 0 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 0 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Incorrect 1 ms 340 KB Output isn't correct
27 Incorrect 2 ms 980 KB Output isn't correct
28 Correct 2 ms 1236 KB Output is correct
29 Correct 2 ms 1364 KB Output is correct
30 Correct 3 ms 2004 KB Output is correct
31 Correct 2 ms 1620 KB Output is correct
32 Correct 3 ms 1748 KB Output is correct
33 Correct 3 ms 2132 KB Output is correct
34 Correct 2 ms 980 KB Output is correct
35 Correct 3 ms 2132 KB Output is correct
36 Incorrect 4 ms 2132 KB Output isn't correct
37 Correct 1 ms 212 KB Output is correct
38 Correct 127 ms 55544 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 13 ms 7124 KB Output is correct
41 Correct 0 ms 212 KB Output is correct
42 Correct 0 ms 340 KB Output is correct
43 Correct 99 ms 55624 KB Output is correct
44 Correct 4 ms 2132 KB Output is correct
45 Correct 97 ms 55596 KB Output is correct
46 Correct 96 ms 55676 KB Output is correct
47 Correct 97 ms 55548 KB Output is correct
48 Correct 97 ms 55544 KB Output is correct
49 Incorrect 107 ms 55628 KB Output isn't correct
50 Correct 97 ms 55528 KB Output is correct
51 Correct 109 ms 55644 KB Output is correct
52 Correct 98 ms 55528 KB Output is correct
53 Correct 96 ms 55532 KB Output is correct
54 Correct 96 ms 55640 KB Output is correct
55 Correct 95 ms 55528 KB Output is correct
56 Correct 111 ms 55684 KB Output is correct
57 Correct 90 ms 55548 KB Output is correct
58 Correct 91 ms 55540 KB Output is correct
59 Correct 90 ms 55540 KB Output is correct
60 Incorrect 94 ms 55544 KB Output isn't correct
61 Incorrect 117 ms 55636 KB Output isn't correct
62 Incorrect 106 ms 55628 KB Output isn't correct
63 Incorrect 103 ms 55628 KB Output isn't correct
64 Incorrect 89 ms 55628 KB Output isn't correct
65 Correct 98 ms 55532 KB Output is correct
66 Correct 99 ms 55660 KB Output is correct
67 Correct 97 ms 55644 KB Output is correct
68 Correct 116 ms 55644 KB Output is correct
69 Correct 93 ms 55540 KB Output is correct
70 Correct 55 ms 35668 KB Output is correct
71 Correct 91 ms 55532 KB Output is correct
72 Correct 101 ms 55672 KB Output is correct
73 Correct 91 ms 55644 KB Output is correct
74 Correct 92 ms 55640 KB Output is correct
75 Correct 95 ms 55544 KB Output is correct
76 Correct 93 ms 55576 KB Output is correct
77 Correct 94 ms 55660 KB Output is correct
78 Correct 91 ms 55636 KB Output is correct
79 Correct 84 ms 55532 KB Output is correct
80 Correct 83 ms 55600 KB Output is correct
81 Correct 86 ms 55544 KB Output is correct
82 Correct 97 ms 55636 KB Output is correct
83 Correct 116 ms 55640 KB Output is correct
84 Correct 99 ms 55548 KB Output is correct
85 Correct 113 ms 55640 KB Output is correct
86 Correct 108 ms 55644 KB Output is correct
87 Correct 112 ms 55636 KB Output is correct
88 Correct 100 ms 55556 KB Output is correct
89 Correct 106 ms 55532 KB Output is correct
90 Correct 60 ms 35652 KB Output is correct
91 Correct 91 ms 55548 KB Output is correct
92 Correct 112 ms 55536 KB Output is correct
93 Correct 112 ms 55532 KB Output is correct
94 Correct 108 ms 55516 KB Output is correct
95 Correct 103 ms 55532 KB Output is correct
96 Correct 98 ms 55548 KB Output is correct
97 Correct 105 ms 55540 KB Output is correct
98 Correct 115 ms 55540 KB Output is correct
99 Correct 94 ms 55636 KB Output is correct
100 Correct 101 ms 55548 KB Output is correct