oj.uz

Submission #335819

# Submission time Handle Problem Language Result Execution time Memory
335819 2020-12-14T03:59:04 Z talant117408 Bomb (IZhO17_bomb) C++17
100 / 100
 587 ms 124268 KB 
/*
    Code written by Talant I.D.
*/
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>

//using namespace __gnu_pbds;
using namespace std;

//typedef tree <int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
  
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
  
inline bool isvowel(char ch){
    ch = tolower(ch);
    return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
  
inline bool isprime(int n){
    if(n < 2 || (n%2 == 0 && n != 2)) return false;
    for(int i = 3; i*i <= n; i++)
        if(n%i == 0) return false;
    return true;
}
 
class Union{
    private:
        vector <int> saizu, link;
    public:
        Union(int n){
            saizu.assign(n, 1); link.resize(n); 
            iota(all(link), 0);
        }
        int find(int n){
            if(link[n] == n) return n;
            return link[n] = find(link[n]);
        }
        int same(int a, int b){
            return find(a) == find(b);
        }
        void unite(int a, int b){
            if(same(a, b)) return;
             
            a = find(a); b = find(b);
            if(saizu[a] < saizu[b]) swap(a, b);
             
            saizu[a] += saizu[b];
            link[b] = a;
        }
        int getsize(int a){
            return saizu[find(a)];
        }
};
 
const int mod = 1e9+7;
 
ll mode(ll a){
    a %= mod;
    if(a < 0) a += mod;
    return a;
}
 
ll subt(ll a, ll b){
    return mode(mode(a)-mode(b));
}
 
ll add(ll a, ll b){
    return mode(mode(a)+mode(b));
}
 
ll mult(ll a, ll b){
    return mode(mode(a)*mode(b));
}
 
ll binpow(ll a, ll b){
    ll res = 1;
    while(b){
        if(b&1) res = mult(res, a);
        a = mult(a, a);
        b >>= 1;
    }
    return res;
}

int main(){
    do_not_disturb
    
    int n, m, i, j;
    cin >> n >> m;
    int grid[n+1][m+1], pref[n+2][m+2], suff[n+2][m+2], up[n+2][m+2], down[n+2][m+2];
    
    for(i = 1; i <= n; i++){
        pref[i][0] = 0;
        suff[i][m+1] = m+1;
        for(j = 1; j <= m; j++){
            up[0][j] = 0;
            down[n+1][j] = n+1;
            char ch;
            cin >> ch;
            grid[i][j] = ch-'0';
        }
    }
    
    for(i = 1; i <= n; i++){
        for(j = 1; j <= m; j++){
            if(grid[i][j]) pref[i][j] = pref[i][j-1];
            else pref[i][j] = j;
        }
        for(j = m; j; j--){
            if(grid[i][j]) suff[i][j] = suff[i][j+1];
            else suff[i][j] = j;
        }
    }
    
    for(j = 1; j <= m; j++){
        for(i = 1; i <= n; i++){
            if(grid[i][j]) up[i][j] = up[i-1][j];
            else up[i][j] = i;
        }
        for(i = n; i; i--){
            if(grid[i][j]) down[i][j] = down[i+1][j];
            else down[i][j] = i;
        }
    }
    
    vector <int> res(m+1, 2e9);
    
    int h = 2e9;
    for(i = 1; i <= n; i++){
        for(j = 1; j <= m; j++){
            if(grid[i][j]){
                h = min(h, down[i][j]-up[i][j]-1);
            }
        }
    }
    for(auto &to : res) to = h;
    
    for(i = 1; i <= n; i++){
        int mnu = 2e9, mnd = 2e9;
        for(j = 1; j <= m; j++){
            if(grid[i][j]){
                mnu = min(mnu, i-up[i][j]);
                mnd = min(mnd, down[i][j]-i);
                res[j-pref[i][j]] = min(res[j-pref[i][j]], (mnu+mnd-1));
            }
            else{
                mnu = mnd = 2e9;
            }
        }
        mnu = mnd = 2e9;
        for(j = m; j; j--){
            if(grid[i][j]){
                mnu = min(mnu, i-up[i][j]);
                mnd = min(mnd, down[i][j]-i);
                res[suff[i][j]-j] = min(res[suff[i][j]-j], (mnu+mnd-1));
            }
            else{
                mnu = mnd = 2e9;
            }
        }
    }
    
    int to_consider = 2e9;
    for(i = 1; i <= n; i++){
        for(j = 1; j <= m; j++){
            if(grid[i][j]){
                to_consider = min(to_consider, suff[i][j]-pref[i][j]-1);
            }
        }
    }
    
    int ans = res[1];
    for(j = 2; j <= to_consider; j++){
        ans = max(ans, res[j]*j);
    }
    cout << ans;
    
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 512 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 492 KB Output is correct
20 Correct 1 ms 492 KB Output is correct
21 Correct 1 ms 492 KB Output is correct
22 Correct 1 ms 492 KB Output is correct
23 Correct 1 ms 492 KB Output is correct
24 Correct 1 ms 512 KB Output is correct
25 Correct 1 ms 492 KB Output is correct
26 Correct 1 ms 492 KB Output is correct
27 Correct 5 ms 2028 KB Output is correct
28 Correct 7 ms 2540 KB Output is correct
29 Correct 7 ms 2924 KB Output is correct
30 Correct 9 ms 4204 KB Output is correct
31 Correct 7 ms 3456 KB Output is correct
32 Correct 7 ms 3564 KB Output is correct
33 Correct 10 ms 4504 KB Output is correct
34 Correct 4 ms 2028 KB Output is correct
35 Correct 9 ms 4460 KB Output is correct
36 Correct 12 ms 4460 KB Output is correct
37 Correct 1 ms 364 KB Output is correct
38 Correct 579 ms 124012 KB Output is correct
39 Correct 1 ms 364 KB Output is correct
40 Correct 64 ms 15764 KB Output is correct
41 Correct 1 ms 364 KB Output is correct
42 Correct 1 ms 492 KB Output is correct
43 Correct 553 ms 124268 KB Output is correct
44 Correct 11 ms 4460 KB Output is correct
45 Correct 552 ms 123948 KB Output is correct
46 Correct 539 ms 123948 KB Output is correct
47 Correct 545 ms 124012 KB Output is correct
48 Correct 549 ms 124012 KB Output is correct
49 Correct 580 ms 124112 KB Output is correct
50 Correct 550 ms 124012 KB Output is correct
51 Correct 545 ms 124012 KB Output is correct
52 Correct 546 ms 124012 KB Output is correct
53 Correct 540 ms 124140 KB Output is correct
54 Correct 529 ms 124156 KB Output is correct
55 Correct 512 ms 124012 KB Output is correct
56 Correct 569 ms 124036 KB Output is correct
57 Correct 516 ms 124012 KB Output is correct
58 Correct 545 ms 124040 KB Output is correct
59 Correct 515 ms 124012 KB Output is correct
60 Correct 530 ms 124012 KB Output is correct
61 Correct 573 ms 124012 KB Output is correct
62 Correct 572 ms 124104 KB Output is correct
63 Correct 587 ms 124040 KB Output is correct
64 Correct 518 ms 124048 KB Output is correct
65 Correct 537 ms 123884 KB Output is correct
66 Correct 532 ms 123756 KB Output is correct
67 Correct 545 ms 123756 KB Output is correct
68 Correct 543 ms 123756 KB Output is correct
69 Correct 512 ms 123756 KB Output is correct
70 Correct 317 ms 79852 KB Output is correct
71 Correct 511 ms 123884 KB Output is correct
72 Correct 506 ms 123628 KB Output is correct
73 Correct 509 ms 123628 KB Output is correct
74 Correct 519 ms 123500 KB Output is correct
75 Correct 548 ms 123636 KB Output is correct
76 Correct 518 ms 123628 KB Output is correct
77 Correct 515 ms 123420 KB Output is correct
78 Correct 520 ms 123400 KB Output is correct
79 Correct 495 ms 123500 KB Output is correct
80 Correct 487 ms 123244 KB Output is correct
81 Correct 502 ms 123372 KB Output is correct
82 Correct 522 ms 123244 KB Output is correct
83 Correct 519 ms 123244 KB Output is correct
84 Correct 500 ms 123244 KB Output is correct
85 Correct 519 ms 123288 KB Output is correct
86 Correct 566 ms 123500 KB Output is correct
87 Correct 508 ms 123500 KB Output is correct
88 Correct 536 ms 123500 KB Output is correct
89 Correct 530 ms 123500 KB Output is correct
90 Correct 328 ms 79468 KB Output is correct
91 Correct 523 ms 123488 KB Output is correct
92 Correct 539 ms 123500 KB Output is correct
93 Correct 573 ms 123372 KB Output is correct
94 Correct 529 ms 123372 KB Output is correct
95 Correct 526 ms 123148 KB Output is correct
96 Correct 525 ms 123244 KB Output is correct
97 Correct 566 ms 123332 KB Output is correct
98 Correct 519 ms 123196 KB Output is correct
99 Correct 534 ms 123244 KB Output is correct
100 Correct 558 ms 123244 KB Output is correct