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Submission #474286

# Submission time Handle Problem Language Result Execution time Memory
474286 2021-09-17T18:52:38 Z ogibogi2004 Bomb (IZhO17_bomb) C++14
90 / 100
 491 ms 56772 KB 
#include<bits/stdc++.h>
using namespace std;
const int MAXN=2502;
char t[MAXN][MAXN];
int n,m,maxw,maxh;
vector<pair<int,int> >segments[MAXN];
vector<pair<int,int> >mws[MAXN];
int up[MAXN][MAXN];
int down[MAXN][MAXN];
int ans[MAXN];
int main()
{
    cin>>n>>m;
    maxh=n;
    maxw=m;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            cin>>t[i][j];
        }
    }
    for(int i=1;i<=n;i++)
    {
        ans[i]=n*m;
        int cnt=0;
        for(int j=1;j<=m;j++)
        {
            ans[j]=n*m;
            if(t[i][j]=='1')cnt++;
            else
            {
                if(cnt>0)maxw=min(maxw,cnt);
                cnt=0;
            }
        }
        if(cnt>0)maxw=min(maxw,cnt);
    }
    //cout<<maxw<<endl;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            if(t[i][j]=='0')up[i][j]=-1;
            else
            {
                if(up[i-1][j]>0)up[i][j]=up[i-1][j];
                else up[i][j]=i;
            }
        }
    }
    for(int i=n;i>=1;i--)
    {
        for(int j=1;j<=m;j++)
        {
            if(t[i][j]=='0')down[i][j]=-1;
            else
            {
                if(down[i+1][j]>0)down[i][j]=down[i+1][j];
                else down[i][j]=i;
            }
        }
    }
    for(int i=1;i<=n;i++)
    {
        int cnt=0;
        for(int j=1;j<=m;j++)
        {
            if(t[i][j]=='0')
            {
                if(cnt>0)mws[i].push_back({j-cnt,j-1});
                cnt=0;
            }
            else cnt++;
        }
        if(cnt>0)mws[i].push_back({m-cnt+1,m});
    }
    /*for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            cout<<up[i][j]<<" ";
        }
        cout<<endl;
    }
    cout<<endl;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            cout<<down[i][j]<<" ";
        }
        cout<<endl;
    }
    cout<<endl;*/
    for(int i=1;i<=n;i++)
    {
        //cout<<i<<":\n";
        for(int j=0;j<mws[i].size();j++)
        {
            int start=mws[i][j].first;
            int mindown=n+1,maxup=-1;
            for(int len=1;start+len-1<=mws[i][j].second;len++)
            {
                mindown=min(mindown,down[i][start+len-1]);
                maxup=max(maxup,up[i][start+len-1]);
                //cout<<mws[i][j].first<<" "<<len<<" "<<mindown<<" "<<maxup<<endl;
                //cout<<mindown<<" "<<maxup<<endl;
                //cout<<mindown<<" "<<maxup<<endl;
                ans[len]=min(ans[len],len*(mindown-maxup+1));
            }
            start=mws[i][j].second;
            mindown=n+1;maxup=-1;
            for(int len=1;start-len+1>=mws[i][j].first;len++)
            {
                mindown=min(mindown,down[i][start-len+1]);
                maxup=max(maxup,up[i][start-len+1]);
                //cout<<mws[i][j].second<<" "<<len<<" "<<mindown<<" "<<maxup<<endl;
                ans[len]=min(ans[len],len*(mindown-maxup+1));
            }
        }
    }
    int ans1=0;
    for(int i=1;i<=maxw;i++)
    {
        //cout<<ans[i]<<" ";
        ans1=max(ans1,ans[i]);
    }
    //cout<<endl;
    cout<<ans1<<endl;
return 0;
}

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:99:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |         for(int j=0;j<mws[i].size();j++)
      |                     ~^~~~~~~~~~~~~~

Subtask #1
90.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 588 KB Output is correct
3 Correct 13 ms 26640 KB Output is correct
4 Correct 13 ms 26700 KB Output is correct
5 Correct 1 ms 460 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Incorrect 1 ms 460 KB Output isn't correct
8 Correct 1 ms 588 KB Output is correct
9 Correct 1 ms 588 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 588 KB Output is correct
12 Correct 1 ms 588 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 1 ms 588 KB Output is correct
15 Correct 1 ms 588 KB Output is correct
16 Correct 1 ms 588 KB Output is correct
17 Correct 1 ms 1100 KB Output is correct
18 Correct 1 ms 1100 KB Output is correct
19 Correct 1 ms 1356 KB Output is correct
20 Correct 1 ms 1356 KB Output is correct
21 Correct 1 ms 972 KB Output is correct
22 Correct 1 ms 1228 KB Output is correct
23 Correct 2 ms 1484 KB Output is correct
24 Correct 1 ms 1228 KB Output is correct
25 Correct 2 ms 1484 KB Output is correct
26 Incorrect 2 ms 1484 KB Output isn't correct
27 Incorrect 8 ms 4116 KB Output isn't correct
28 Correct 11 ms 4300 KB Output is correct
29 Correct 11 ms 5508 KB Output is correct
30 Correct 15 ms 6348 KB Output is correct
31 Correct 13 ms 5068 KB Output is correct
32 Correct 13 ms 5836 KB Output is correct
33 Correct 17 ms 6696 KB Output is correct
34 Correct 8 ms 4684 KB Output is correct
35 Correct 18 ms 6728 KB Output is correct
36 Incorrect 17 ms 6732 KB Output isn't correct
37 Correct 1 ms 588 KB Output is correct
38 Correct 458 ms 55584 KB Output is correct
39 Correct 1 ms 588 KB Output is correct
40 Correct 60 ms 15724 KB Output is correct
41 Correct 1 ms 588 KB Output is correct
42 Correct 2 ms 1484 KB Output is correct
43 Correct 434 ms 55492 KB Output is correct
44 Correct 17 ms 6724 KB Output is correct
45 Correct 477 ms 55600 KB Output is correct
46 Correct 441 ms 56772 KB Output is correct
47 Correct 432 ms 55644 KB Output is correct
48 Correct 432 ms 55488 KB Output is correct
49 Incorrect 451 ms 55560 KB Output isn't correct
50 Correct 431 ms 55528 KB Output is correct
51 Correct 440 ms 55496 KB Output is correct
52 Correct 470 ms 55620 KB Output is correct
53 Correct 430 ms 55556 KB Output is correct
54 Correct 425 ms 55552 KB Output is correct
55 Correct 448 ms 55544 KB Output is correct
56 Correct 491 ms 56716 KB Output is correct
57 Correct 430 ms 55516 KB Output is correct
58 Correct 421 ms 55536 KB Output is correct
59 Correct 419 ms 55556 KB Output is correct
60 Incorrect 455 ms 55540 KB Output isn't correct
61 Incorrect 442 ms 55652 KB Output isn't correct
62 Incorrect 448 ms 55500 KB Output isn't correct
63 Incorrect 445 ms 55576 KB Output isn't correct
64 Incorrect 420 ms 55692 KB Output isn't correct
65 Correct 437 ms 55552 KB Output is correct
66 Correct 427 ms 55532 KB Output is correct
67 Correct 442 ms 55616 KB Output is correct
68 Correct 435 ms 55492 KB Output is correct
69 Correct 442 ms 55440 KB Output is correct
70 Correct 266 ms 44484 KB Output is correct
71 Correct 457 ms 55520 KB Output is correct
72 Correct 438 ms 55432 KB Output is correct
73 Correct 456 ms 55504 KB Output is correct
74 Correct 427 ms 55528 KB Output is correct
75 Correct 437 ms 55468 KB Output is correct
76 Correct 434 ms 55528 KB Output is correct
77 Correct 441 ms 55492 KB Output is correct
78 Correct 428 ms 55540 KB Output is correct
79 Correct 415 ms 55536 KB Output is correct
80 Correct 412 ms 55516 KB Output is correct
81 Correct 408 ms 55504 KB Output is correct
82 Correct 428 ms 55544 KB Output is correct
83 Correct 429 ms 55504 KB Output is correct
84 Correct 419 ms 55388 KB Output is correct
85 Correct 421 ms 55568 KB Output is correct
86 Correct 451 ms 55572 KB Output is correct
87 Correct 418 ms 55664 KB Output is correct
88 Correct 433 ms 55588 KB Output is correct
89 Correct 427 ms 55576 KB Output is correct
90 Correct 273 ms 44484 KB Output is correct
91 Correct 422 ms 55548 KB Output is correct
92 Correct 427 ms 55540 KB Output is correct
93 Correct 483 ms 55492 KB Output is correct
94 Correct 430 ms 55524 KB Output is correct
95 Correct 423 ms 55468 KB Output is correct
96 Correct 434 ms 55492 KB Output is correct
97 Correct 444 ms 55456 KB Output is correct
98 Correct 477 ms 55488 KB Output is correct
99 Correct 430 ms 55528 KB Output is correct
100 Correct 453 ms 55472 KB Output is correct