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Submission #554794

# Submission time Handle Problem Language Result Execution time Memory
554794 2022-04-29T12:39:30 Z roctes7 Mecho (IOI09_mecho) C++17
76 / 100
 493 ms 31732 KB 
#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
#define mpa make_pair
typedef long long ll;
typedef long double ld;
const int MOD=1e9+7;
const int MAX=2e5+1;

ll n,s;
string arr[802][802];
bool vist[802][802];
ll mechoDist[802][802];
ll BeesDist[802][802];
pair<ll,ll> mecho;
pair<ll,ll> home;

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

bool valid (ll x,ll y){
return x>=1&&x<=n&&y>=1&&y<=n&&!vist[x][y]&&arr[x][y]!="T";
}


bool check =false;

void bfs (ll val){
vist[mecho.fi][mecho.se]=true;
queue<pair<ll,ll>>q;
q.push(mecho);

while (!q.empty()){
    auto p =q.front();
    ll x = p.fi;
    ll y = p.se;
    q.pop();
if(x==home.fi&&y==home.se)check=true;

 if(val+mechoDist[x][y]>=BeesDist[x][y])continue;


for (ll i=0;i<4;i++){
        ll nx = x+dx[i];
        ll ny = y+dy[i];

        if(valid(nx,ny)){
          vist[nx][ny]=true;
          q.push(mpa(nx,ny));
        }
    }
}



}

int main(){

fastio
//freopen("11.in","r",stdin);
//freopen("cl.out","w",stdout);

cin>>n>>s;


for (ll i=1;i<=n;i++){
    string s;
    cin>>s;
    for (ll j=1;j<=n;j++){
        arr[i][j]=s[j-1];

        if(arr[i][j]=="M")mecho=mpa(i,j);
        else if (arr[i][j]=="D")home = mpa(i,j);
    }
}

queue <pair<ll,ll>> q;
q.push(mecho);
vist[mecho.fi][mecho.se]=true;

while(!q.empty()){
    auto p = q.front();
    ll x = p.fi;
    ll y = p.se;

    q.pop();

    for (ll i=0;i<4;i++){
        ll nx = x+dx[i];
        ll ny = y+dy[i];

        if(valid(nx,ny)&&arr[nx][ny]!="H"){
            mechoDist[nx][ny]=mechoDist[x][y]+1;
            vist[nx][ny]=true;
            q.push(mpa(nx,ny));
        }
    }

}


for (ll i=1;i<=n;i++)for(ll j=1;j<=n;j++){
mechoDist[i][j]=mechoDist[i][j]/s;
vist[i][j]=false;
}



for (ll i=1;i<=n;i++)for (ll j=1;j<=n;j++){
    if(arr[i][j]=="H"){
            q.push(mpa(i,j));
            vist[i][j]=true;
    }
}



while(!q.empty()){
    auto p = q.front();
    ll x = p.fi;
    ll y = p.se;
    q.pop();

    for (ll i=0;i<4;i++){
        ll nx = x+dx[i];
        ll ny = y+dy[i];

        if(valid(nx,ny)&&arr[nx][ny]!="D"&&arr[nx][ny]!="H"){
            BeesDist[nx][ny]=BeesDist[x][y]+1;
            vist[nx][ny]=true;
            q.push(mpa(nx,ny));
        }
    }

}


/*cout<<endl<<endl;
for(ll i=1;i<=n;i++){for (ll j=1;j<=n;j++){
        if(arr[i][j]=="G")
     cout<<mechoDist[i][j];
     else cout<<arr[i][j];
}
cout<<endl;
}

cout<<endl<<endl;
for(ll i=1;i<=n;i++){for (ll j=1;j<=n;j++){
    cout<<BeesDist[i][j];
}
cout<<endl;
}*/




ll l=0;
ll r = 1e9;
ll ans =-1;
while (l<=r){
    ll mid = (l+r)/2;
    for (ll i=1;i<=n;i++)for(ll j=1;j<=n;j++){
 vist[i][j]=false;
}
check=false;
bfs(mid);

if(check){
    l=mid+1;
    ans = mid;

} else {
r=mid-1;
}



}

cout<<ans;
return 0;


}





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);
}

Subtask #1
76.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 20436 KB Output is correct
2 Correct 10 ms 20436 KB Output is correct
3 Correct 10 ms 20476 KB Output is correct
4 Correct 10 ms 20476 KB Output is correct
5 Correct 10 ms 20540 KB Output is correct
6 Correct 10 ms 20564 KB Output is correct
7 Correct 336 ms 31456 KB Output is correct
8 Correct 11 ms 20564 KB Output is correct
9 Correct 11 ms 20580 KB Output is correct
10 Correct 10 ms 20564 KB Output is correct
11 Correct 10 ms 20536 KB Output is correct
12 Correct 10 ms 20948 KB Output is correct
13 Correct 11 ms 20904 KB Output is correct
14 Correct 11 ms 21056 KB Output is correct
15 Correct 11 ms 20656 KB Output is correct
16 Correct 10 ms 20592 KB Output is correct
17 Correct 10 ms 20692 KB Output is correct
18 Correct 10 ms 20692 KB Output is correct
19 Correct 11 ms 20692 KB Output is correct
20 Correct 11 ms 20752 KB Output is correct
21 Correct 12 ms 20780 KB Output is correct
22 Correct 11 ms 20860 KB Output is correct
23 Correct 11 ms 20900 KB Output is correct
24 Correct 11 ms 20948 KB Output is correct
25 Correct 12 ms 20948 KB Output is correct
26 Correct 11 ms 20948 KB Output is correct
27 Correct 13 ms 21080 KB Output is correct
28 Correct 11 ms 21120 KB Output is correct
29 Correct 11 ms 21112 KB Output is correct
30 Correct 11 ms 21076 KB Output is correct
31 Correct 11 ms 21144 KB Output is correct
32 Correct 13 ms 21184 KB Output is correct
33 Correct 25 ms 24688 KB Output is correct
34 Correct 29 ms 24864 KB Output is correct
35 Incorrect 87 ms 25132 KB Output isn't correct
36 Correct 33 ms 25284 KB Output is correct
37 Correct 34 ms 25576 KB Output is correct
38 Incorrect 102 ms 25724 KB Output isn't correct
39 Correct 34 ms 25936 KB Output is correct
40 Correct 37 ms 26264 KB Output is correct
41 Incorrect 156 ms 26484 KB Output isn't correct
42 Correct 41 ms 26572 KB Output is correct
43 Correct 41 ms 26988 KB Output is correct
44 Incorrect 174 ms 27084 KB Output isn't correct
45 Correct 49 ms 27080 KB Output is correct
46 Correct 47 ms 27724 KB Output is correct
47 Incorrect 221 ms 27720 KB Output isn't correct
48 Correct 56 ms 27768 KB Output is correct
49 Correct 53 ms 28364 KB Output is correct
50 Incorrect 258 ms 28448 KB Output isn't correct
51 Correct 62 ms 28396 KB Output is correct
52 Correct 66 ms 28960 KB Output is correct
53 Incorrect 290 ms 29160 KB Output isn't correct
54 Correct 67 ms 28900 KB Output is correct
55 Correct 73 ms 29536 KB Output is correct
56 Incorrect 378 ms 29836 KB Output isn't correct
57 Correct 88 ms 29636 KB Output is correct
58 Correct 74 ms 30116 KB Output is correct
59 Incorrect 384 ms 30496 KB Output isn't correct
60 Correct 85 ms 30116 KB Output is correct
61 Correct 83 ms 30664 KB Output is correct
62 Incorrect 470 ms 31160 KB Output isn't correct
63 Correct 339 ms 31052 KB Output is correct
64 Correct 493 ms 31160 KB Output is correct
65 Correct 449 ms 31160 KB Output is correct
66 Correct 403 ms 31152 KB Output is correct
67 Correct 311 ms 31160 KB Output is correct
68 Correct 206 ms 31140 KB Output is correct
69 Correct 180 ms 31216 KB Output is correct
70 Correct 141 ms 31096 KB Output is correct
71 Correct 148 ms 31104 KB Output is correct
72 Correct 170 ms 31208 KB Output is correct
73 Correct 236 ms 31700 KB Output is correct
74 Correct 206 ms 31628 KB Output is correct
75 Correct 224 ms 31656 KB Output is correct
76 Correct 227 ms 31608 KB Output is correct
77 Correct 240 ms 31692 KB Output is correct
78 Correct 224 ms 31712 KB Output is correct
79 Correct 186 ms 31636 KB Output is correct
80 Correct 257 ms 31564 KB Output is correct
81 Correct 244 ms 31604 KB Output is correct
82 Correct 196 ms 31616 KB Output is correct
83 Correct 295 ms 31556 KB Output is correct
84 Correct 290 ms 31732 KB Output is correct
85 Correct 276 ms 31568 KB Output is correct
86 Correct 322 ms 31568 KB Output is correct
87 Correct 301 ms 31560 KB Output is correct
88 Correct 322 ms 31392 KB Output is correct
89 Correct 315 ms 31720 KB Output is correct
90 Correct 340 ms 31396 KB Output is correct
91 Correct 300 ms 31464 KB Output is correct
92 Correct 331 ms 31468 KB Output is correct