oj.uz

Submission #936249

# Submission time Handle Problem Language Result Execution time Memory
936249 2024-03-01T13:22:48 Z guagua0407 Bomb (IZhO17_bomb) C++17
90 / 100
 111 ms 74304 KB 
//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=2505;
const int inf=1e9;
int c[mxn][mxn];
int up[mxn][mxn];
int down[mxn][mxn];
int n,m;
int ans[mxn];
int mn=inf;

void sir(){
    for(int i=1;i<=n;i++){
        for(int l=1;l<=m;l++){
            if(!c[i][l]) continue;
            int r=l;
            while(r<=m and c[i][r]) r++;
            int a=inf,b=inf;
            for(int x=l;x<min(r,l+mn);x++){
                a=min(a,up[i][x]);
                b=min(b,down[i][x]);
                ans[x-l+1]=min(ans[x-l+1],a+b-1);
            }
            //cout<<i<<' '<<l<<' '<<r-1<<' '<<a<<' '<<b<<'\n';
            l=r-1;
        }
    }
}

int main() {_
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            char cur;
            cin>>cur;
            c[i][j]=(cur=='1');
            //cnt+=c[i][j];
            //cout<<c[i][j];
        }
        //cout<<'\n';
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(c[i][j]) up[i][j]=up[i-1][j]+1;
        }
    }
    for(int i=n;i>=1;i--){
        for(int j=1;j<=m;j++){
            if(c[i][j]) down[i][j]=down[i+1][j]+1;
        }
    }
    for(int i=1;i<=n;i++){
        for(int l=1;l<=m;l++){
            if(!c[i][l]) continue;
            int r=l;
            while(r<=m and c[i][r]) r++;
            mn=min(mn,r-l);
            l=r-1;
        }
    }
    if(mn==inf) mn=0;
    for(int i=1;i<=mn;i++){
        ans[i]=inf;
    }
    sir();
    for(int i=1;i<=n;i++){
        reverse(c[i]+1,c[i]+m+1);
        reverse(up[i]+1,up[i]+m+1);
        reverse(down[i]+1,down[i]+m+1);
    }
    sir();
    int mx=0;
    for(int i=1;i<=mn;i++){
        assert(ans[i]>0);
        mx=max(mx,i*ans[i]);
    }
    cout<<mx<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message

bomb.cpp: In function 'void setIO(std::string)':
bomb.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bomb.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
90.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 9 ms 71772 KB Output is correct
4 Correct 10 ms 70488 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Incorrect 0 ms 2396 KB Output isn't correct
8 Correct 1 ms 2652 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2652 KB Output is correct
12 Correct 0 ms 2396 KB Output is correct
13 Correct 0 ms 2396 KB Output is correct
14 Correct 0 ms 2652 KB Output is correct
15 Correct 1 ms 2652 KB Output is correct
16 Correct 1 ms 2652 KB Output is correct
17 Correct 1 ms 7004 KB Output is correct
18 Correct 1 ms 7004 KB Output is correct
19 Correct 1 ms 7004 KB Output is correct
20 Correct 1 ms 7004 KB Output is correct
21 Correct 1 ms 4956 KB Output is correct
22 Correct 1 ms 7004 KB Output is correct
23 Correct 1 ms 7032 KB Output is correct
24 Correct 1 ms 7004 KB Output is correct
25 Correct 2 ms 7004 KB Output is correct
26 Incorrect 1 ms 7000 KB Output isn't correct
27 Incorrect 3 ms 13148 KB Output isn't correct
28 Correct 5 ms 10588 KB Output is correct
29 Correct 4 ms 13660 KB Output is correct
30 Correct 5 ms 14172 KB Output is correct
31 Correct 4 ms 11096 KB Output is correct
32 Correct 6 ms 13916 KB Output is correct
33 Correct 5 ms 16220 KB Output is correct
34 Correct 3 ms 11100 KB Output is correct
35 Correct 5 ms 14684 KB Output is correct
36 Incorrect 5 ms 19036 KB Output isn't correct
37 Correct 1 ms 2652 KB Output is correct
38 Correct 109 ms 73960 KB Output is correct
39 Correct 1 ms 2652 KB Output is correct
40 Correct 16 ms 31472 KB Output is correct
41 Correct 1 ms 2648 KB Output is correct
42 Correct 1 ms 7004 KB Output is correct
43 Correct 98 ms 73968 KB Output is correct
44 Correct 5 ms 19032 KB Output is correct
45 Correct 101 ms 73808 KB Output is correct
46 Correct 109 ms 73808 KB Output is correct
47 Correct 106 ms 73804 KB Output is correct
48 Correct 103 ms 73968 KB Output is correct
49 Incorrect 94 ms 74024 KB Output isn't correct
50 Correct 100 ms 73964 KB Output is correct
51 Correct 100 ms 73864 KB Output is correct
52 Correct 96 ms 73828 KB Output is correct
53 Correct 97 ms 73808 KB Output is correct
54 Correct 97 ms 73800 KB Output is correct
55 Correct 96 ms 73808 KB Output is correct
56 Correct 106 ms 73840 KB Output is correct
57 Correct 99 ms 73940 KB Output is correct
58 Correct 104 ms 74068 KB Output is correct
59 Correct 94 ms 73964 KB Output is correct
60 Incorrect 91 ms 73952 KB Output isn't correct
61 Incorrect 91 ms 73948 KB Output isn't correct
62 Incorrect 94 ms 73812 KB Output isn't correct
63 Incorrect 111 ms 73944 KB Output isn't correct
64 Incorrect 97 ms 73812 KB Output isn't correct
65 Correct 95 ms 73952 KB Output is correct
66 Correct 102 ms 74040 KB Output is correct
67 Correct 99 ms 73952 KB Output is correct
68 Correct 101 ms 73812 KB Output is correct
69 Correct 96 ms 74004 KB Output is correct
70 Correct 70 ms 62184 KB Output is correct
71 Correct 102 ms 73976 KB Output is correct
72 Correct 102 ms 73808 KB Output is correct
73 Correct 104 ms 73812 KB Output is correct
74 Correct 105 ms 74028 KB Output is correct
75 Correct 102 ms 73940 KB Output is correct
76 Correct 100 ms 73808 KB Output is correct
77 Correct 104 ms 73808 KB Output is correct
78 Correct 102 ms 73964 KB Output is correct
79 Correct 105 ms 73964 KB Output is correct
80 Correct 105 ms 74072 KB Output is correct
81 Correct 105 ms 73948 KB Output is correct
82 Correct 99 ms 73808 KB Output is correct
83 Correct 102 ms 73964 KB Output is correct
84 Correct 106 ms 74304 KB Output is correct
85 Correct 104 ms 73812 KB Output is correct
86 Correct 94 ms 73816 KB Output is correct
87 Correct 98 ms 73948 KB Output is correct
88 Correct 103 ms 74008 KB Output is correct
89 Correct 105 ms 74032 KB Output is correct
90 Correct 68 ms 63208 KB Output is correct
91 Correct 99 ms 73812 KB Output is correct
92 Correct 96 ms 73988 KB Output is correct
93 Correct 93 ms 74032 KB Output is correct
94 Correct 100 ms 73808 KB Output is correct
95 Correct 104 ms 73960 KB Output is correct
96 Correct 102 ms 74032 KB Output is correct
97 Correct 93 ms 73788 KB Output is correct
98 Correct 107 ms 73992 KB Output is correct
99 Correct 97 ms 73812 KB Output is correct
100 Correct 100 ms 73808 KB Output is correct