Submission #554972

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
554972	2022-04-29T19:15:45 Z	savackexp	Mecho (IOI09_mecho)	C++14	84 / 100	296 ms	16844 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<<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

84.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	5332 KB	Output is correct
2	Correct	14 ms	5332 KB	Output is correct
3	Correct	14 ms	5444 KB	Output is correct
4	Correct	14 ms	5456 KB	Output is correct
5	Correct	13 ms	5468 KB	Output is correct
6	Correct	15 ms	5492 KB	Output is correct
7	Correct	230 ms	16376 KB	Output is correct
8	Correct	10 ms	5544 KB	Output is correct
9	Correct	16 ms	5540 KB	Output is correct
10	Correct	10 ms	5544 KB	Output is correct
11	Correct	15 ms	5588 KB	Output is correct
12	Incorrect	13 ms	5972 KB	Output isn't correct
13	Incorrect	17 ms	5844 KB	Output isn't correct
14	Correct	13 ms	6008 KB	Output is correct
15	Correct	13 ms	5588 KB	Output is correct
16	Correct	14 ms	5600 KB	Output is correct
17	Correct	10 ms	5640 KB	Output is correct
18	Correct	13 ms	5644 KB	Output is correct
19	Correct	11 ms	5588 KB	Output is correct
20	Correct	14 ms	5704 KB	Output is correct
21	Correct	10 ms	5716 KB	Output is correct
22	Correct	11 ms	5800 KB	Output is correct
23	Correct	11 ms	5904 KB	Output is correct
24	Correct	13 ms	5844 KB	Output is correct
25	Correct	16 ms	5992 KB	Output is correct
26	Correct	16 ms	5972 KB	Output is correct
27	Correct	14 ms	6044 KB	Output is correct
28	Correct	13 ms	5972 KB	Output is correct
29	Correct	13 ms	6104 KB	Output is correct
30	Correct	11 ms	6100 KB	Output is correct
31	Correct	11 ms	6100 KB	Output is correct
32	Correct	12 ms	6152 KB	Output is correct
33	Correct	26 ms	10068 KB	Output is correct
34	Correct	28 ms	10092 KB	Output is correct
35	Correct	63 ms	10084 KB	Output is correct
36	Correct	32 ms	10756 KB	Output is correct
37	Correct	31 ms	10708 KB	Output is correct
38	Correct	85 ms	10756 KB	Output is correct
39	Correct	60 ms	11432 KB	Output is correct
40	Correct	37 ms	11448 KB	Output is correct
41	Correct	83 ms	11348 KB	Output is correct
42	Correct	46 ms	11988 KB	Output is correct
43	Correct	44 ms	12116 KB	Output is correct
44	Correct	127 ms	12112 KB	Output is correct
45	Correct	60 ms	12772 KB	Output is correct
46	Correct	50 ms	12772 KB	Output is correct
47	Correct	140 ms	12784 KB	Output is correct
48	Correct	61 ms	13412 KB	Output is correct
49	Correct	72 ms	13524 KB	Output is correct
50	Correct	198 ms	13468 KB	Output is correct
51	Correct	63 ms	14128 KB	Output is correct
52	Correct	68 ms	14036 KB	Output is correct
53	Correct	180 ms	14132 KB	Output is correct
54	Correct	74 ms	14784 KB	Output is correct
55	Correct	82 ms	14780 KB	Output is correct
56	Correct	247 ms	14804 KB	Output is correct
57	Correct	83 ms	15444 KB	Output is correct
58	Correct	78 ms	15452 KB	Output is correct
59	Correct	257 ms	15472 KB	Output is correct
60	Correct	91 ms	16080 KB	Output is correct
61	Correct	83 ms	16084 KB	Output is correct
62	Correct	296 ms	16144 KB	Output is correct
63	Correct	192 ms	16140 KB	Output is correct
64	Correct	276 ms	16148 KB	Output is correct
65	Correct	228 ms	16136 KB	Output is correct
66	Correct	222 ms	16080 KB	Output is correct
67	Correct	188 ms	16140 KB	Output is correct
68	Correct	113 ms	16212 KB	Output is correct
69	Correct	114 ms	16200 KB	Output is correct
70	Correct	113 ms	16076 KB	Output is correct
71	Correct	120 ms	16124 KB	Output is correct
72	Incorrect	91 ms	16128 KB	Output isn't correct
73	Incorrect	111 ms	16844 KB	Output isn't correct
74	Correct	187 ms	16764 KB	Output is correct
75	Correct	180 ms	16684 KB	Output is correct
76	Correct	154 ms	16704 KB	Output is correct
77	Correct	171 ms	16764 KB	Output is correct
78	Correct	184 ms	16684 KB	Output is correct
79	Correct	146 ms	16688 KB	Output is correct
80	Correct	154 ms	16620 KB	Output is correct
81	Correct	172 ms	16804 KB	Output is correct
82	Correct	145 ms	16596 KB	Output is correct
83	Correct	217 ms	16540 KB	Output is correct
84	Correct	193 ms	16596 KB	Output is correct
85	Correct	184 ms	16528 KB	Output is correct
86	Correct	205 ms	16596 KB	Output is correct
87	Correct	192 ms	16588 KB	Output is correct
88	Correct	213 ms	16564 KB	Output is correct
89	Correct	194 ms	16476 KB	Output is correct
90	Correct	254 ms	16460 KB	Output is correct
91	Correct	223 ms	16448 KB	Output is correct
92	Correct	221 ms	16472 KB	Output is correct