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Submission #472736

# Submission time Handle Problem Language Result Execution time Memory
472736 2021-09-14T09:01:05 Z hackerbhaiya Mecho (IOI09_mecho) C++17
100 / 100
 575 ms 11328 KB 
#include<bits/stdc++.h>
// #pragma GCC optimize("Ofast")
// #pragma GCC target("avx,avx2,fma")
// #pragma GCC optimization("unroll-loops")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC optimize("fast-math")
// #pragma GCC optimize("no-stack-protector")
// #define ll __int128
#define ll long long
// #define ll int
#define f(i,a,b) for(int i=a;i<b;i++)
#define mod 1000000007
// #define mod 998244353 
#define mp make_pair
#define uniq(v) (v).erase(unique(all(v)),(v).end())
#define ff first
#define ss second
#define rf(i,a,b) for(int i=a;i>=b;i--)
#define sc(a) scanf("%lld",&a)
#define pf printf
#define sz(a) (int)(a.size())
#define psf push_front
#define ppf pop_front
#define ppb pop_back
#define pb push_back
#define pq priority_queue
#define all(s) s.begin(),s.end()
#define sp(a) setprecision(a)
#define rz resize
#define ld long double
#define inf (ll)1e18
#define ub upper_bound
#define lb lower_bound
#define bs binary_search
#define eb emplace_back
const double pi = acos(-1);
ll binpow(ll a, ll b){ll res=1;while(b!=0){if(b&1)res*=a;a*=a;b>>=1;}return res;}
// ll binpow(ll a, ll b, ll md){ll res=1;a%=mod;while(b!=0){if(b&1)res*=a,res%=md;a*=a,a%=md;b>>=1;}return res%md;}
 
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    // freopen("xortransform.in","r",stdin);
    // freopen("xortransform.out","w",stdout);
// #ifndef ONLINE_JUDGE
//     freopen("input.txt","r",stdin);
//     freopen("output.txt","w",stdout);
// #endif
    int z=1;
    // cin>>z;
    f(i,1,z+1)
    {
        //cout<<"Case #"<<i<<": ";
        ll n,d,sx,sy,fx,fy;
        int dx[]={0,1,0,-1};
        int dy[]={1,0,-1,0};
        cin>>n>>d;
        vector<string> s(n);
        f(i,0,n)
            cin>>s[i];
        ll l=0,r=n*n+1;
        queue<vector<ll> > q;
        vector<vector<ll> > dis(n,vector<ll> (n,inf));
        f(i,0,n)
        {
            f(j,0,n)
            {
                if(s[i][j]=='H')
                    q.push({i,j}),dis[i][j]=0;
                else if(s[i][j]=='M')
                    sx=i,sy=j;
                else if(s[i][j]=='D')
                    fx=i,fy=j;
            }
        }
        while(!q.empty())
        {
            auto temp=q.front();
            q.pop();
            ll x=temp[0],y=temp[1];
            f(i,0,4)
            {
                ll xx=x+dx[i],yy=y+dy[i];
                if(xx>=0 && yy>=0 && xx<n && yy<n && s[xx][yy]!='T' && s[xx][yy]!='D' && dis[xx][yy]>d+dis[x][y])
                    dis[xx][yy]=d+dis[x][y],q.push({xx,yy});             
            }
        }
        while(l<=r)
        {
            ll mid=(l+r)/2;
            queue<vector<ll> > q;
            vector<vector<ll> > dis2(n,vector<ll> (n,inf));
            if(dis[sx][sy]>mid*d)
                q.push({sx,sy});
            dis2[sx][sy]=mid*d;
            while(!q.empty())
            {
                auto temp=q.front();
                q.pop();
                ll x=temp[0],y=temp[1];
                if(x==fx && y==fy)
                    break;
                f(i,0,4)
                {
                    ll xx=x+dx[i],yy=y+dy[i];
                    if(xx>=0 && yy>=0 && xx<n && yy<n && s[xx][yy]!='T' && dis2[xx][yy]>1+dis2[x][y])
                    {
                        if((xx==fx && yy==fy) || (1+dis2[x][y]<dis[xx][yy]))
                            dis2[xx][yy]=1+dis2[x][y],q.push({xx,yy});       
                    }
                }
            }
            if(dis2[fx][fy]<inf)
                l=mid+1;
            else
                r=mid-1;
        }
        cout<<r<<"\n";
    }
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:116:27: warning: 'fy' may be used uninitialized in this function [-Wmaybe-uninitialized]
  116 |             if(dis2[fx][fy]<inf)
      |                           ^
mecho.cpp:116:23: warning: 'fx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  116 |             if(dis2[fx][fy]<inf)
      |                       ^
mecho.cpp:96:26: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   96 |             if(dis[sx][sy]>mid*d)
      |                          ^
mecho.cpp:96:22: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   96 |             if(dis[sx][sy]>mid*d)
      |                      ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 325 ms 11316 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 12 ms 2440 KB Output is correct
34 Correct 14 ms 2444 KB Output is correct
35 Correct 76 ms 2412 KB Output is correct
36 Correct 18 ms 3112 KB Output is correct
37 Correct 19 ms 3072 KB Output is correct
38 Correct 97 ms 3064 KB Output is correct
39 Correct 22 ms 3776 KB Output is correct
40 Correct 23 ms 3740 KB Output is correct
41 Correct 123 ms 3744 KB Output is correct
42 Correct 27 ms 4608 KB Output is correct
43 Correct 36 ms 4580 KB Output is correct
44 Correct 173 ms 4580 KB Output is correct
45 Correct 32 ms 5476 KB Output is correct
46 Correct 32 ms 5492 KB Output is correct
47 Correct 189 ms 5452 KB Output is correct
48 Correct 39 ms 6492 KB Output is correct
49 Correct 45 ms 6688 KB Output is correct
50 Correct 236 ms 6540 KB Output is correct
51 Correct 47 ms 7520 KB Output is correct
52 Correct 49 ms 7528 KB Output is correct
53 Correct 298 ms 7508 KB Output is correct
54 Correct 55 ms 8696 KB Output is correct
55 Correct 62 ms 8628 KB Output is correct
56 Correct 365 ms 8624 KB Output is correct
57 Correct 60 ms 9888 KB Output is correct
58 Correct 67 ms 9924 KB Output is correct
59 Correct 447 ms 9868 KB Output is correct
60 Correct 72 ms 11224 KB Output is correct
61 Correct 77 ms 11148 KB Output is correct
62 Correct 471 ms 11248 KB Output is correct
63 Correct 320 ms 11156 KB Output is correct
64 Correct 575 ms 11144 KB Output is correct
65 Correct 423 ms 11192 KB Output is correct
66 Correct 338 ms 11124 KB Output is correct
67 Correct 366 ms 11172 KB Output is correct
68 Correct 151 ms 11248 KB Output is correct
69 Correct 157 ms 11208 KB Output is correct
70 Correct 120 ms 11236 KB Output is correct
71 Correct 138 ms 11272 KB Output is correct
72 Correct 100 ms 11232 KB Output is correct
73 Correct 144 ms 11272 KB Output is correct
74 Correct 216 ms 11180 KB Output is correct
75 Correct 272 ms 11252 KB Output is correct
76 Correct 246 ms 11304 KB Output is correct
77 Correct 231 ms 11220 KB Output is correct
78 Correct 322 ms 11200 KB Output is correct
79 Correct 185 ms 11252 KB Output is correct
80 Correct 240 ms 11148 KB Output is correct
81 Correct 258 ms 11216 KB Output is correct
82 Correct 224 ms 11156 KB Output is correct
83 Correct 292 ms 11224 KB Output is correct
84 Correct 253 ms 11132 KB Output is correct
85 Correct 283 ms 11248 KB Output is correct
86 Correct 276 ms 11228 KB Output is correct
87 Correct 336 ms 11188 KB Output is correct
88 Correct 292 ms 11196 KB Output is correct
89 Correct 318 ms 11180 KB Output is correct
90 Correct 315 ms 11184 KB Output is correct
91 Correct 303 ms 11328 KB Output is correct
92 Correct 370 ms 11224 KB Output is correct