Submission #554986

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
554986	2022-04-29T19:28:51 Z	savackexp	Mecho (IOI09_mecho)	C++14	72 / 100	271 ms	16772 KB

mecho

#include<bits/stdc++.h>
using namespace std;
#define in insert
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define endl "\n"
#define Endl "\n"
#define ENDL "\n"
#define fi first
#define se second
#define be  begin()
#define en  end()
#define pb push_back
typedef long long ll;
typedef long double ld;
const int MOD=1e9+7;
const int MAX=2e5+1;/*
ll  binpow(ll  a, ll  b) {
    ld  res = 1;
    while (b > 0) {
        if (b & 1)
            res = res * a;
        a = a * a;
        b >>= 1;
    }

    return res;
}
unsigned long long power(unsigned long long x,
                                ll y, ll p)
{
    unsigned long long res = 1; // Initialize result

    x = x % p; // Update x if it is more than or
    // equal to p

    while (y > 0)
    {

        // If y is odd, multiply x with result
        if (y & 1)
            res = (res * x) % p;

        // y must be even now
        y = y >> 1; // y = y/2
        x = (x * x) % p;
    }
    return res;
}

unsigned long long modInverse(unsigned long long n,
                                            ll p)
{
    return power(n, p - 2, p);
}
*/
ll n  , k ;
ll dx[]={0 , 0 , 1, -1};
ll dy[]={1 , -1 , 0, 0};
char grid[805][805];
ll vis[805][805];
ll levelm[805][805];
ll levelh[805][805];
vector<pair<ll,ll>>hive;
bool valid(ll x , ll y)
{
    return x>=0 && y>=0 && x<n && y<n && grid[x][y]!='H' && grid[x][y]!='T';
}
bool valid1(ll x , ll y)
{
    return x>=0 && y>=0 && x<n && y<n  && grid[x][y]!='T';
}
pair<ll,ll>m , d;
bool check(ll u)
{
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
            {
                levelm[i][j]=1e18;
            }
        }
        memset(vis , 0 ,sizeof vis );
        queue< pair<ll,ll> >q;
        q.push({m.fi,m.se});
        vis[m.fi][m.se]=1;
        levelm[m.fi][m.se]=0;
        while(!q.empty())
        {
            pair<ll,ll>p=q.front();
            q.pop();
            for(int i=0;i<4;i++)
            {
                ll nx = p.fi +  dx[i];
                ll ny = p.se +  dy[i];
                if(!valid(nx,ny))continue;
                levelm[nx][ny]=min(levelm[p.fi][p.se]+1 ,levelm[nx][ny]);
                ll qe = (levelm[nx][ny])/k;
                if(levelh[nx][ny]  < qe + u)continue;
                if(vis[nx][ny])continue;

                vis[nx][ny] = 1;
                q.push({nx , ny});

            }

        }

    if(levelm[d.fi][d.se] != 1e18)
    {
        return true;
    }
    return false;
}

void bfs(vector<pair<ll,ll>>h)
{
    queue<pair<ll,ll> >q;
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<n;j++)
        {
            levelh[i][j]=1e18;
        }
    }
    for(int i=0;i<h.size();i++)
    {
        levelh[h[i].fi][h[i].se]=0;
        vis[h[i].fi][h[i].se]=1;
        q.push(h[i]);
    }
    while(!q.empty())
    {
        pair<ll,ll>p=q.front();
        q.pop();
        for(int i=0;i<4;i++)
        {

            ll nx = p.fi + dx[i];
            ll ny = p.se + dy[i];
            if(!valid1(nx,ny))continue;
            levelh[nx][ny] = min(levelh[p.fi][p.se]+1 ,levelh[nx][ny]);
            if(vis[nx][ny])continue;
            vis[nx][ny] = 1;
            q.push({nx , ny});
        }

    }
}





int main()
{

        fastio

        //freopen("gravity.in","r",stdin);
        //freopen("gravity.out","w",stdout);

        cin>>n>>k;
        for(int i=0;i<n;i++)
        {
            string s;
            cin>>s;
            for(int j=0;j<s.size();j++)
            {
                grid[i][j]=s[j];
                if(s[j]=='H')hive.pb({i,j});
                else if(s[j]=='M')m={i,j};
                else if(s[j]=='D')d={i,j};
            }
        }
        bfs(hive);
        memset(vis , 0 ,sizeof vis);
        ll l=0;
        ll r=1e18;
        ll ans=-1;
        while(l<=r)
        {
            ll mid=(l+r)/2;
            if(check(mid))
            {
                ans=mid;
                l=mid+1;
            }
            else r=mid-1;
        }
        cout<<ans-1<<endl;






































    return 0;
    }
/*
5 6
0 4 0
0 3 1
0 1 1
0 2 1
1 2 1
3 4 0

*/

Compilation message

mecho.cpp: In function 'void bfs(std::vector<std::pair<long long int, long long int> >)':
mecho.cpp:125:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  125 |     for(int i=0;i<h.size();i++)
      |                 ~^~~~~~~~~
mecho.cpp: In function 'int main()':
mecho.cpp:167:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  167 |             for(int j=0;j<s.size();j++)
      |                         ~^~~~~~~~~

Subtask #1

72.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	10 ms	5440 KB	Output is correct
2	Correct	10 ms	5332 KB	Output is correct
3	Correct	10 ms	5452 KB	Output is correct
4	Correct	10 ms	5460 KB	Output is correct
5	Correct	11 ms	5472 KB	Output is correct
6	Correct	13 ms	5496 KB	Output is correct
7	Correct	215 ms	16312 KB	Output is correct
8	Correct	11 ms	5460 KB	Output is correct
9	Correct	16 ms	5460 KB	Output is correct
10	Correct	10 ms	5460 KB	Output is correct
11	Correct	11 ms	5460 KB	Output is correct
12	Incorrect	13 ms	5988 KB	Output isn't correct
13	Incorrect	11 ms	5844 KB	Output isn't correct
14	Incorrect	11 ms	5972 KB	Output isn't correct
15	Correct	11 ms	5588 KB	Output is correct
16	Correct	11 ms	5592 KB	Output is correct
17	Correct	11 ms	5588 KB	Output is correct
18	Correct	12 ms	5644 KB	Output is correct
19	Correct	11 ms	5588 KB	Output is correct
20	Correct	10 ms	5588 KB	Output is correct
21	Correct	12 ms	5800 KB	Output is correct
22	Correct	12 ms	5800 KB	Output is correct
23	Correct	11 ms	5900 KB	Output is correct
24	Correct	11 ms	5844 KB	Output is correct
25	Correct	12 ms	5972 KB	Output is correct
26	Correct	12 ms	5992 KB	Output is correct
27	Correct	13 ms	6100 KB	Output is correct
28	Correct	11 ms	6044 KB	Output is correct
29	Correct	12 ms	6100 KB	Output is correct
30	Correct	11 ms	6108 KB	Output is correct
31	Correct	12 ms	6100 KB	Output is correct
32	Correct	14 ms	6152 KB	Output is correct
33	Correct	31 ms	10104 KB	Output is correct
34	Correct	26 ms	10032 KB	Output is correct
35	Correct	52 ms	10084 KB	Output is correct
36	Correct	36 ms	10708 KB	Output is correct
37	Correct	37 ms	10752 KB	Output is correct
38	Correct	70 ms	10680 KB	Output is correct
39	Correct	39 ms	11348 KB	Output is correct
40	Correct	43 ms	11348 KB	Output is correct
41	Correct	82 ms	11404 KB	Output is correct
42	Correct	41 ms	12076 KB	Output is correct
43	Correct	42 ms	12116 KB	Output is correct
44	Correct	101 ms	12116 KB	Output is correct
45	Correct	49 ms	12772 KB	Output is correct
46	Correct	54 ms	12772 KB	Output is correct
47	Correct	134 ms	12788 KB	Output is correct
48	Correct	54 ms	13448 KB	Output is correct
49	Correct	55 ms	13404 KB	Output is correct
50	Correct	146 ms	13396 KB	Output is correct
51	Correct	65 ms	14036 KB	Output is correct
52	Correct	70 ms	14136 KB	Output is correct
53	Correct	170 ms	14132 KB	Output is correct
54	Correct	75 ms	14780 KB	Output is correct
55	Correct	67 ms	14676 KB	Output is correct
56	Correct	219 ms	14800 KB	Output is correct
57	Correct	84 ms	15444 KB	Output is correct
58	Correct	76 ms	15452 KB	Output is correct
59	Correct	232 ms	15472 KB	Output is correct
60	Correct	87 ms	16076 KB	Output is correct
61	Correct	88 ms	16068 KB	Output is correct
62	Correct	254 ms	16136 KB	Output is correct
63	Correct	191 ms	16128 KB	Output is correct
64	Correct	271 ms	16140 KB	Output is correct
65	Correct	239 ms	16140 KB	Output is correct
66	Correct	199 ms	16136 KB	Output is correct
67	Incorrect	198 ms	16140 KB	Output isn't correct
68	Correct	130 ms	16200 KB	Output is correct
69	Correct	100 ms	16080 KB	Output is correct
70	Correct	107 ms	16200 KB	Output is correct
71	Correct	100 ms	16200 KB	Output is correct
72	Incorrect	102 ms	16212 KB	Output isn't correct
73	Incorrect	131 ms	16760 KB	Output isn't correct
74	Correct	154 ms	16716 KB	Output is correct
75	Correct	172 ms	16716 KB	Output is correct
76	Correct	165 ms	16772 KB	Output is correct
77	Correct	183 ms	16716 KB	Output is correct
78	Incorrect	170 ms	16684 KB	Output isn't correct
79	Correct	149 ms	16688 KB	Output is correct
80	Correct	154 ms	16684 KB	Output is correct
81	Correct	161 ms	16584 KB	Output is correct
82	Correct	150 ms	16684 KB	Output is correct
83	Correct	213 ms	16608 KB	Output is correct
84	Correct	188 ms	16552 KB	Output is correct
85	Correct	177 ms	16588 KB	Output is correct
86	Correct	202 ms	16568 KB	Output is correct
87	Correct	203 ms	16592 KB	Output is correct
88	Correct	221 ms	16476 KB	Output is correct
89	Correct	215 ms	16476 KB	Output is correct
90	Correct	224 ms	16444 KB	Output is correct
91	Correct	215 ms	16404 KB	Output is correct
92	Correct	198 ms	16428 KB	Output is correct