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Submission #1039373

# Submission time Handle Problem Language Result Execution time Memory
1039373 2024-07-30T19:21:20 Z Ludissey Mecho (IOI09_mecho) C++17
100 / 100
 426 ms 12292 KB 
#include <bits/stdc++.h>
#define int long long
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
 
using namespace std;
vector<vector<bool>> visited;
vector<vector<int>> dist;
 
vector<vector<char>> grid;
vector<vector<int>> beeT;
pair<int,int> home;
pair<int,int> bear;
int N,S;
bool f(int t){
    priority_queue<pair<int,pair<int,int>>> q;
    visited.clear();
    dist.clear();
    visited.resize(N,vector<bool>(N,false));
    dist.resize(N,vector<int>(N,1e14));
    dist[bear.first][bear.second]=t*S;
    q.push({-t*S,bear});
    while(!q.empty()){
        int x=q.top().second.first,y=q.top().second.second; q.pop();
        if((dist[x][y])/S>=beeT[x][y]&&grid[x][y]!='D') continue;
        if(visited[x][y]) continue;
        visited[x][y]=true;
        if(x-1>=0&&(grid[x-1][y]=='G'||grid[x-1][y]=='M'||grid[x-1][y]=='D')&&dist[x][y]+1<dist[x-1][y]){
            dist[x-1][y]=dist[x][y]+1;
            q.push({-dist[x-1][y], {x-1,y}});
        }
        if(x+1<N&&(grid[x+1][y]=='G'||grid[x+1][y]=='M'||grid[x+1][y]=='D')&&dist[x][y]+1<dist[x+1][y]){
            dist[x+1][y]=dist[x][y]+1;
            q.push({-dist[x+1][y], {x+1,y}});
        }
        if(y-1>=0&&(grid[x][y-1]=='G'||grid[x][y-1]=='M'||grid[x][y-1]=='D')&&dist[x][y]+1<dist[x][y-1]){
            dist[x][y-1]=dist[x][y]+1;
            q.push({-dist[x][y-1], {x,y-1}});
        }
        if(y+1<N&&(grid[x][y+1]=='G'||grid[x][y+1]=='M'||grid[x][y+1]=='D')&&dist[x][y]+1<dist[x][y+1]){
            dist[x][y+1]=dist[x][y]+1;
            q.push({-dist[x][y+1], {x,y+1}});
        }
    }
    return visited[home.first][home.second];
}
 
signed main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    cin >> N >> S;
    grid.resize(N,vector<char>(N));
    visited.resize(N,vector<bool>(N,false));
    for (int i = 0; i < N; i++) { for (int j = 0; j < N; j++) cin >> grid[i][j]; }
    for (int i = 0; i < N; i++) { for (int j = 0; j < N; j++){
        if(grid[i][j]=='M') bear={i,j};
        else if(grid[i][j]=='D') home={i,j};
    } 
    }
    beeT.resize(N,vector<int>(N,1e14));
    priority_queue<pair<int,pair<int,int>>> q;
    for (int i = 0; i < N; i++) { for (int j = 0; j < N; j++) if(grid[i][j]=='H') { q.push({0,{i,j}}); beeT[i][j]=0; }}
    while(!q.empty()){
        int x=q.top().second.first,y=q.top().second.second; q.pop();
        if(visited[x][y]) continue;
        visited[x][y]=true;
        if(x-1>=0&&(grid[x-1][y]=='G'||grid[x-1][y]=='M')&&beeT[x][y]+1<beeT[x-1][y]){
            beeT[x-1][y]=beeT[x][y]+1;
            q.push({-beeT[x-1][y], {x-1,y}});
        }
        if(x+1<N&&(grid[x+1][y]=='G'||grid[x+1][y]=='M')&&beeT[x][y]+1<beeT[x+1][y]){
            beeT[x+1][y]=beeT[x][y]+1;
            q.push({-beeT[x+1][y], {x+1,y}});
        }
        if(y-1>=0&&(grid[x][y-1]=='G'||grid[x][y-1]=='M')&&beeT[x][y]+1<beeT[x][y-1]){
            beeT[x][y-1]=beeT[x][y]+1;
            q.push({-beeT[x][y-1], {x,y-1}});
        }
        if(y+1<N&&(grid[x][y+1]=='G'||grid[x][y+1]=='M')&&beeT[x][y]+1<beeT[x][y+1]){
            beeT[x][y+1]=beeT[x][y]+1;
            q.push({-beeT[x][y+1], {x,y+1}});
        }
    }
    int l=0,r=1e9;
    while(l<r){
        int mid=(l+r+1)/2;
        if(f(mid)){
            l=mid;
        }else{
            r=mid-1;
        }
    }
    if(!f(0)) cout << -1 << "\n";
    else cout << l << "\n";
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 318 ms 11780 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 416 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 388 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 12 ms 2688 KB Output is correct
34 Correct 14 ms 2576 KB Output is correct
35 Correct 63 ms 2924 KB Output is correct
36 Correct 13 ms 3200 KB Output is correct
37 Correct 15 ms 3284 KB Output is correct
38 Correct 88 ms 3312 KB Output is correct
39 Correct 17 ms 4040 KB Output is correct
40 Correct 21 ms 4016 KB Output is correct
41 Correct 112 ms 3944 KB Output is correct
42 Correct 23 ms 4804 KB Output is correct
43 Correct 27 ms 4848 KB Output is correct
44 Correct 146 ms 4800 KB Output is correct
45 Correct 26 ms 5704 KB Output is correct
46 Correct 39 ms 5696 KB Output is correct
47 Correct 181 ms 5696 KB Output is correct
48 Correct 35 ms 6668 KB Output is correct
49 Correct 41 ms 6672 KB Output is correct
50 Correct 216 ms 6696 KB Output is correct
51 Correct 39 ms 7876 KB Output is correct
52 Correct 47 ms 7780 KB Output is correct
53 Correct 258 ms 7752 KB Output is correct
54 Correct 52 ms 8920 KB Output is correct
55 Correct 63 ms 8912 KB Output is correct
56 Correct 301 ms 8924 KB Output is correct
57 Correct 61 ms 10204 KB Output is correct
58 Correct 63 ms 10164 KB Output is correct
59 Correct 357 ms 10132 KB Output is correct
60 Correct 59 ms 11588 KB Output is correct
61 Correct 74 ms 11432 KB Output is correct
62 Correct 387 ms 11440 KB Output is correct
63 Correct 228 ms 11428 KB Output is correct
64 Correct 426 ms 11508 KB Output is correct
65 Correct 382 ms 11520 KB Output is correct
66 Correct 302 ms 11548 KB Output is correct
67 Correct 269 ms 11412 KB Output is correct
68 Correct 136 ms 11528 KB Output is correct
69 Correct 152 ms 11592 KB Output is correct
70 Correct 132 ms 11516 KB Output is correct
71 Correct 115 ms 11472 KB Output is correct
72 Correct 117 ms 11496 KB Output is correct
73 Correct 172 ms 12292 KB Output is correct
74 Correct 275 ms 12236 KB Output is correct
75 Correct 252 ms 12208 KB Output is correct
76 Correct 228 ms 12256 KB Output is correct
77 Correct 227 ms 12244 KB Output is correct
78 Correct 255 ms 12152 KB Output is correct
79 Correct 238 ms 12160 KB Output is correct
80 Correct 220 ms 12224 KB Output is correct
81 Correct 235 ms 12224 KB Output is correct
82 Correct 219 ms 12252 KB Output is correct
83 Correct 257 ms 12104 KB Output is correct
84 Correct 280 ms 12108 KB Output is correct
85 Correct 261 ms 11996 KB Output is correct
86 Correct 270 ms 12096 KB Output is correct
87 Correct 270 ms 12052 KB Output is correct
88 Correct 258 ms 11916 KB Output is correct
89 Correct 309 ms 11936 KB Output is correct
90 Correct 305 ms 11912 KB Output is correct
91 Correct 291 ms 12048 KB Output is correct
92 Correct 301 ms 11880 KB Output is correct