oj.uz

Submission #541402

# Submission time Handle Problem Language Result Execution time Memory
541402 2022-03-23T13:24:44 Z nigus Bomb (IZhO17_bomb) C++14
43 / 100
 1000 ms 56140 KB 
#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define per(i, b, a) for(int i = b - 1; i >= a; i--)
#define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef long double ld;
typedef unsigned long long ull;

unsigned seed = chrono::system_clock::now().time_since_epoch().count();
mt19937 eng(seed);

ll random2(){
    return (1ll << 31ll)*eng()+eng();
}

ll n,m,k,q,T;

const ll big = 1000000007;
const ll big2 = 1000000009;
const ll mod =  998244353;

const int MAXN = 2501;

bool grid[MAXN][MAXN] = {0};

bool covered[MAXN][MAXN] = {0};

bool can_place(int i, int j, int a, int b){
    if(n-i < a || m-j < b)return 0;
    rep(c1,0,a){
        rep(c2,0,b){
            if(!grid[i+c1][j+c2])return 0;
        }
    }
    return 1;
}

bool can_cover(int i, int j, int a, int b){
    rep(dx,0,a){
        rep(dy,0,b){
            int i2 = i - dx;
            int j2 = j - dy;
            if(i2 >= 0 && j2 >= 0 && can_place(i2,j2,a,b))return 1;
        }
    }
    return 0;
}

bool solve(int a, int b){
    rep(c1,0,n){
        rep(c2,0,m){
            if(grid[c1][c2] && (c1 == n-1 || !grid[c1+1][c2] || c1 == 0 || !grid[c1-1][c2]) && !can_cover(c1,c2,a,b))return 0;
        }
    }
    return 1;
}

int lft[MAXN][MAXN] = {0};
int up[MAXN][MAXN] = {0};

int mina = big;
int minb = big;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

   // freopen("fhc.txt","r",stdin);
   // freopen("autput.txt","w",stdout);

    ll a,b,c,d,e;

    cin >> n >> m;
    rep(c1,0,n){
        string s;
        cin >> s;
        rep(c2,0,m){
            grid[c1][c2] = (s[c2] == '1');
        }
    }

    rep(c1,0,n){
        rep(c2,0,m){
            if(grid[c1][c2]){
                if(c1 == 0){
                    up[c1][c2] = 1;
                }
                else{
                    up[c1][c2] = up[c1-1][c2]+1;
                }

                if(c1 == n-1 || !grid[c1+1][c2])mina = min(mina, up[c1][c2]);

                if(c2 == 0){
                    lft[c1][c2] = 1;
                }
                else{
                    lft[c1][c2] = lft[c1][c2-1]+1;
                }

                if(c2 == m-1 || !grid[c1][c2+1])minb = min(minb, lft[c1][c2]);
            }
        }
    }

    ll ans = 0;

    rep(a,1,mina+1){

            int lo = 1;
            int hi = minb+1;
            while(lo < hi-1){
                int mid = (lo+hi)/2;
                if(solve(a, mid)){
                    lo = mid;
                }
                else{
                    hi = mid;
                }
            }
            ans = max(ans, ll(a)*ll(lo));

    }
    cout << ans << "\n";


    return 0;
}

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:79:8: warning: unused variable 'a' [-Wunused-variable]
   79 |     ll a,b,c,d,e;
      |        ^
bomb.cpp:79:10: warning: unused variable 'b' [-Wunused-variable]
   79 |     ll a,b,c,d,e;
      |          ^
bomb.cpp:79:12: warning: unused variable 'c' [-Wunused-variable]
   79 |     ll a,b,c,d,e;
      |            ^
bomb.cpp:79:14: warning: unused variable 'd' [-Wunused-variable]
   79 |     ll a,b,c,d,e;
      |              ^
bomb.cpp:79:16: warning: unused variable 'e' [-Wunused-variable]
   79 |     ll a,b,c,d,e;
      |                ^

Subtask #1
43.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 12 ms 26448 KB Output is correct
4 Correct 11 ms 26456 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 456 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 524 KB Output is correct
17 Correct 1 ms 980 KB Output is correct
18 Correct 1 ms 724 KB Output is correct
19 Correct 1 ms 980 KB Output is correct
20 Correct 1 ms 980 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 1 ms 724 KB Output is correct
23 Correct 14 ms 1096 KB Output is correct
24 Correct 1 ms 980 KB Output is correct
25 Correct 8 ms 1236 KB Output is correct
26 Correct 4 ms 1360 KB Output is correct
27 Correct 3 ms 4052 KB Output is correct
28 Correct 3 ms 1620 KB Output is correct
29 Execution timed out 1086 ms 5204 KB Time limit exceeded
30 Correct 772 ms 4320 KB Output is correct
31 Execution timed out 1092 ms 3156 KB Time limit exceeded
32 Correct 83 ms 4180 KB Output is correct
33 Execution timed out 1093 ms 5332 KB Time limit exceeded
34 Correct 3 ms 1748 KB Output is correct
35 Correct 52 ms 2132 KB Output is correct
36 Correct 766 ms 6752 KB Output is correct
37 Correct 1 ms 468 KB Output is correct
38 Execution timed out 1061 ms 56036 KB Time limit exceeded
39 Correct 1 ms 468 KB Output is correct
40 Execution timed out 1076 ms 15872 KB Time limit exceeded
41 Correct 1 ms 468 KB Output is correct
42 Correct 317 ms 1364 KB Output is correct
43 Execution timed out 1067 ms 52164 KB Time limit exceeded
44 Execution timed out 1090 ms 6100 KB Time limit exceeded
45 Execution timed out 1047 ms 53468 KB Time limit exceeded
46 Execution timed out 1022 ms 55948 KB Time limit exceeded
47 Execution timed out 1061 ms 53564 KB Time limit exceeded
48 Execution timed out 1042 ms 56012 KB Time limit exceeded
49 Correct 171 ms 56068 KB Output is correct
50 Execution timed out 1053 ms 55988 KB Time limit exceeded
51 Execution timed out 1049 ms 56020 KB Time limit exceeded
52 Execution timed out 1046 ms 55984 KB Time limit exceeded
53 Execution timed out 1061 ms 55516 KB Time limit exceeded
54 Execution timed out 1070 ms 42756 KB Time limit exceeded
55 Execution timed out 1067 ms 41028 KB Time limit exceeded
56 Execution timed out 1038 ms 56140 KB Time limit exceeded
57 Execution timed out 1033 ms 36172 KB Time limit exceeded
58 Execution timed out 1057 ms 41164 KB Time limit exceeded
59 Execution timed out 1067 ms 38088 KB Time limit exceeded
60 Execution timed out 1051 ms 47820 KB Time limit exceeded
61 Execution timed out 1058 ms 55948 KB Time limit exceeded
62 Execution timed out 1045 ms 55924 KB Time limit exceeded
63 Execution timed out 1043 ms 56140 KB Time limit exceeded
64 Execution timed out 1037 ms 38896 KB Time limit exceeded
65 Execution timed out 1036 ms 54972 KB Time limit exceeded
66 Execution timed out 1064 ms 51876 KB Time limit exceeded
67 Execution timed out 1060 ms 56012 KB Time limit exceeded
68 Execution timed out 1029 ms 56016 KB Time limit exceeded
69 Execution timed out 1056 ms 35620 KB Time limit exceeded
70 Execution timed out 1050 ms 15824 KB Time limit exceeded
71 Execution timed out 1052 ms 28664 KB Time limit exceeded
72 Execution timed out 1057 ms 34228 KB Time limit exceeded
73 Execution timed out 1058 ms 34688 KB Time limit exceeded
74 Execution timed out 1045 ms 36172 KB Time limit exceeded
75 Execution timed out 1063 ms 37812 KB Time limit exceeded
76 Execution timed out 1057 ms 39120 KB Time limit exceeded
77 Execution timed out 1056 ms 39664 KB Time limit exceeded
78 Execution timed out 1025 ms 39816 KB Time limit exceeded
79 Execution timed out 1055 ms 12304 KB Time limit exceeded
80 Execution timed out 1027 ms 13692 KB Time limit exceeded
81 Execution timed out 1036 ms 14044 KB Time limit exceeded
82 Execution timed out 1055 ms 42324 KB Time limit exceeded
83 Execution timed out 1027 ms 42480 KB Time limit exceeded
84 Correct 267 ms 7668 KB Output is correct
85 Execution timed out 1056 ms 41420 KB Time limit exceeded
86 Correct 153 ms 54824 KB Output is correct
87 Execution timed out 1099 ms 40196 KB Time limit exceeded
88 Execution timed out 1041 ms 41036 KB Time limit exceeded
89 Execution timed out 1062 ms 49864 KB Time limit exceeded
90 Execution timed out 1008 ms 29860 KB Time limit exceeded
91 Execution timed out 1036 ms 45004 KB Time limit exceeded
92 Execution timed out 1020 ms 46676 KB Time limit exceeded
93 Correct 708 ms 53964 KB Output is correct
94 Execution timed out 1020 ms 48428 KB Time limit exceeded
95 Execution timed out 1035 ms 42520 KB Time limit exceeded
96 Execution timed out 1020 ms 42044 KB Time limit exceeded
97 Correct 412 ms 54544 KB Output is correct
98 Execution timed out 1040 ms 41800 KB Time limit exceeded
99 Execution timed out 1031 ms 48104 KB Time limit exceeded
100 Correct 203 ms 53304 KB Output is correct