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Submission #659075

# Submission time Handle Problem Language Result Execution time Memory
659075 2022-11-16T10:54:28 Z ansgar Mecho (IOI09_mecho) C++17
100 / 100
 234 ms 16396 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define vi vector<int>
#define vvi vector<vi>
#define pii pair<int,int>
#define vpii vector<pii>
#define vvpii vector<vpii>
#define vb vector<bool>
#define vc vector<char>
#define vvc vector<vc>
#define vvb vector<vb>
#define si set<int>
#define mii map<int,int>

const int mod=1e9+7;
const int N=2e5+1;
const int LN=LLONG_MAX/10;
vvc L;
int n,k;
vvi Bees;
vvi Bear;
vpii BeesLoc;
bool inside(int y,int x){
    return (y>=0 and y<n and x>=0 and x<n and L[y][x]!='T');
}
void bfsBees(){
    queue<pii> Q;
    for(auto B : BeesLoc){
        Q.push(B);
        Bees[B.first][B.second]=-1;
    }
    while(Q.size()){
        auto B=Q.front();
        int x=B.second;
        int y=B.first;
        Q.pop();
        if(inside(y-1,x) and L[y-1][x]!='D' and Bees[y-1][x]>Bees[y][x]+1){
            Bees[y-1][x]=Bees[y][x]+1;
            Q.push({y-1,x});
        }
        if(inside(y+1,x) and L[y+1][x]!='D' and Bees[y+1][x]>Bees[y][x]+1){
            Bees[y+1][x]=Bees[y][x]+1;
            Q.push({y+1,x});
        }
        if(inside(y,x-1) and L[y][x-1]!='D' and Bees[y][x-1]>Bees[y][x]+1){
            Bees[y][x-1]=Bees[y][x]+1;
            Q.push({y,x-1});
        }
        if(inside(y,x+1) and L[y][x+1]!='D' and Bees[y][x+1]>Bees[y][x]+1){
            Bees[y][x+1]=Bees[y][x]+1;
            Q.push({y,x+1});
        }
    }
}
void bfsBear(int sy,int sx,int w){
    queue<pii> Q;
    Q.push({sy,sx});
    Bear[sy][sx]=0;
    if(Bees[sy][sx]<w)return;
    while(Q.size()){
        auto B=Q.front();
        int x=B.second;
        int y=B.first;
        Q.pop();
        if(inside(y-1,x) and Bear[y-1][x]>Bear[y][x]+1 and Bees[y-1][x]-((Bear[y][x]+1)/k)>=w){
            Bear[y-1][x]=Bear[y][x]+1;
            Q.push({y-1,x});
        }
        if(inside(y+1,x) and Bear[y+1][x]>Bear[y][x]+1 and Bees[y+1][x]-((Bear[y][x]+1)/k)>=w){
            Bear[y+1][x]=Bear[y][x]+1;
            Q.push({y+1,x});
        }
        if(inside(y,x-1) and Bear[y][x-1]>Bear[y][x]+1 and Bees[y][x-1]-((Bear[y][x]+1)/k)>=w){
            Bear[y][x-1]=Bear[y][x]+1;
            Q.push({y,x-1});
        }
        if(inside(y,x+1) and Bear[y][x+1]>Bear[y][x]+1 and Bees[y][x+1]-((Bear[y][x]+1)/k)>=w){
            Bear[y][x+1]=Bear[y][x]+1;
            Q.push({y,x+1});
        }
    }
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin>>n>>k;
    L=vvc(n,vc(n));
    Bear=vvi(n,vi(n,LN));
    Bees=vvi(n,vi(n,LN));
    int sx,sy,ex,ey;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cin>>L[i][j];
            if(L[i][j]=='M')sy=i,sx=j;
            if(L[i][j]=='D')ey=i,ex=j;
            if(L[i][j]=='H')BeesLoc.emplace_back(i,j);
        }
    }
    bfsBees();
    int high=LN;
    int low=0;
    int res=-1;
    while(high>=low){
        int mid=(high+low)/2;
        Bear=vvi(n,vi(n,LN));
        bfsBear(sy,sx,mid);
        if(Bear[ey][ex]==LN)high=mid-1;
        else{
            res=mid;
            low=mid+1;
        }
    }
    cout<<res;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:109:19: warning: 'ey' may be used uninitialized in this function [-Wmaybe-uninitialized]
  109 |         if(Bear[ey][ex]==LN)high=mid-1;
      |                   ^
mecho.cpp:109:23: warning: 'ex' may be used uninitialized in this function [-Wmaybe-uninitialized]
  109 |         if(Bear[ey][ex]==LN)high=mid-1;
      |                       ^
mecho.cpp:108:16: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
  108 |         bfsBear(sy,sx,mid);
      |         ~~~~~~~^~~~~~~~~~~
mecho.cpp:108:16: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 157 ms 16228 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 0 ms 264 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 468 KB Output is correct
32 Correct 2 ms 468 KB Output is correct
33 Correct 14 ms 3460 KB Output is correct
34 Correct 15 ms 3368 KB Output is correct
35 Correct 29 ms 3376 KB Output is correct
36 Correct 20 ms 4396 KB Output is correct
37 Correct 20 ms 4360 KB Output is correct
38 Correct 37 ms 4396 KB Output is correct
39 Correct 25 ms 5340 KB Output is correct
40 Correct 26 ms 5468 KB Output is correct
41 Correct 50 ms 5440 KB Output is correct
42 Correct 33 ms 6604 KB Output is correct
43 Correct 39 ms 6604 KB Output is correct
44 Correct 65 ms 6516 KB Output is correct
45 Correct 42 ms 7864 KB Output is correct
46 Correct 46 ms 7900 KB Output is correct
47 Correct 77 ms 7944 KB Output is correct
48 Correct 43 ms 9276 KB Output is correct
49 Correct 44 ms 9264 KB Output is correct
50 Correct 103 ms 9284 KB Output is correct
51 Correct 53 ms 10816 KB Output is correct
52 Correct 54 ms 10884 KB Output is correct
53 Correct 121 ms 10836 KB Output is correct
54 Correct 71 ms 12520 KB Output is correct
55 Correct 70 ms 12500 KB Output is correct
56 Correct 152 ms 12520 KB Output is correct
57 Correct 80 ms 14372 KB Output is correct
58 Correct 80 ms 14296 KB Output is correct
59 Correct 176 ms 14420 KB Output is correct
60 Correct 100 ms 16176 KB Output is correct
61 Correct 100 ms 16192 KB Output is correct
62 Correct 196 ms 16180 KB Output is correct
63 Correct 173 ms 16396 KB Output is correct
64 Correct 234 ms 16184 KB Output is correct
65 Correct 215 ms 16184 KB Output is correct
66 Correct 191 ms 16192 KB Output is correct
67 Correct 183 ms 16232 KB Output is correct
68 Correct 124 ms 16196 KB Output is correct
69 Correct 119 ms 16244 KB Output is correct
70 Correct 111 ms 16304 KB Output is correct
71 Correct 109 ms 16284 KB Output is correct
72 Correct 99 ms 16232 KB Output is correct
73 Correct 111 ms 16272 KB Output is correct
74 Correct 115 ms 16248 KB Output is correct
75 Correct 130 ms 16264 KB Output is correct
76 Correct 129 ms 16308 KB Output is correct
77 Correct 127 ms 16232 KB Output is correct
78 Correct 128 ms 16236 KB Output is correct
79 Correct 122 ms 16284 KB Output is correct
80 Correct 128 ms 16276 KB Output is correct
81 Correct 136 ms 16312 KB Output is correct
82 Correct 131 ms 16252 KB Output is correct
83 Correct 161 ms 16236 KB Output is correct
84 Correct 137 ms 16312 KB Output is correct
85 Correct 143 ms 16260 KB Output is correct
86 Correct 141 ms 16228 KB Output is correct
87 Correct 140 ms 16188 KB Output is correct
88 Correct 157 ms 16240 KB Output is correct
89 Correct 152 ms 16236 KB Output is correct
90 Correct 153 ms 16256 KB Output is correct
91 Correct 156 ms 16204 KB Output is correct
92 Correct 156 ms 16276 KB Output is correct