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Submission #928815

# Submission time Handle Problem Language Result Execution time Memory
928815 2024-02-17T06:10:48 Z absolutePi Mecho (IOI09_mecho) C++17
100 / 100
 529 ms 6740 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 800;
int n,s;
int mx[]={1,-1,0,0},my[]={0,0,1,-1};
vector<vector<char>> grid(N,vector<char>(N));


bool valid_sit(int x,int y){
    return (x>=0&&y>=0&&x<n&&y<n&&(grid[x][y]=='G'||grid[x][y]=='M'));
}

bool mecho_reached(int m,int b){
    return (m/s)<b;
}

int main(){
    //ios::sync_with_stdio(false);
    //cin.tie(0);
    cin >> n >> s;
    vector<pair<int,int>> bees;
    pair<int,int> mecho,home;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cin >> grid[i][j];
            if(grid[i][j]=='H'){
                bees.push_back({i,j});
            }
            if(grid[i][j]=='M'){
                mecho = {i,j};
            }
            if(grid[i][j]=='D'){
                home = {i,j};
            }
        }
    }
    int l=0,r=n*n;
    while(l<=r){
        vector<vector<bool>> visb(n,vector<bool>(n)),vism(n,vector<bool>(n));
        vector<vector<int>> distb(n,vector<int>(n)),distm(n,vector<int>(n));    
        queue<pair<int,int>> q;
        int eating_time=l+(r-l)/2;
        for(auto i : bees){
            q.push(i);
            visb[i.first][i.second]=true;
        }
        while(!q.empty()){
            int x,y;
            tie(x,y)=q.front();
            q.pop();
            for(int i=0;i<4;i++){
                int newx=x+mx[i];
                int newy=y+my[i];
                if(valid_sit(newx,newy)&&!visb[newx][newy]){
                    distb[newx][newy]=distb[x][y]+1;
                    q.push({newx,newy});
                    visb[newx][newy]=true;
                }
            }
        }
        q.push(mecho);
        vism[mecho.first][mecho.second]=true;
        if(distb[mecho.first][mecho.second]<=eating_time){q.pop();}
        while(!q.empty()){
            int x,y;
            tie(x,y)=q.front();
            q.pop();
            for(int i=0;i<4;i++){
                int newx=x+mx[i];
                int newy=y+my[i];
                if(valid_sit(newx,newy)&&!vism[newx][newy]&&(mecho_reached(distm[x][y]+1,distb[newx][newy]-eating_time))){
                    distm[newx][newy]=distm[x][y]+1;
                    q.push({newx,newy});
                    vism[newx][newy]=true;
                }
            }
        }
        bool reached=false;
        for(int i=0;i<4;i++){
            int newx=home.first+mx[i];
            int newy=home.second+my[i];
            if(valid_sit(newx,newy)&&(mecho_reached(distm[newx][newy],distb[newx][newy]-eating_time)&&vism[newx][newy])){
                reached=true;
            }
        }
        if(reached){
            l=eating_time+1;
        }
        else{
            r=eating_time-1;
        }
    }
    cout << l-1 << '\n';
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 860 KB Output is correct
2 Correct 1 ms 1012 KB Output is correct
3 Correct 1 ms 860 KB Output is correct
4 Correct 1 ms 860 KB Output is correct
5 Correct 1 ms 856 KB Output is correct
6 Correct 1 ms 856 KB Output is correct
7 Correct 457 ms 6524 KB Output is correct
8 Correct 2 ms 860 KB Output is correct
9 Correct 1 ms 860 KB Output is correct
10 Correct 1 ms 860 KB Output is correct
11 Correct 1 ms 860 KB Output is correct
12 Correct 2 ms 1116 KB Output is correct
13 Correct 2 ms 1116 KB Output is correct
14 Correct 2 ms 1116 KB Output is correct
15 Correct 1 ms 860 KB Output is correct
16 Correct 1 ms 860 KB Output is correct
17 Correct 1 ms 860 KB Output is correct
18 Correct 1 ms 860 KB Output is correct
19 Correct 2 ms 856 KB Output is correct
20 Correct 1 ms 1116 KB Output is correct
21 Correct 1 ms 860 KB Output is correct
22 Correct 1 ms 860 KB Output is correct
23 Correct 2 ms 1116 KB Output is correct
24 Correct 1 ms 1116 KB Output is correct
25 Correct 2 ms 1072 KB Output is correct
26 Correct 3 ms 1116 KB Output is correct
27 Correct 2 ms 1116 KB Output is correct
28 Correct 3 ms 1112 KB Output is correct
29 Correct 2 ms 1112 KB Output is correct
30 Correct 2 ms 1116 KB Output is correct
31 Correct 2 ms 1116 KB Output is correct
32 Correct 2 ms 1116 KB Output is correct
33 Correct 35 ms 2072 KB Output is correct
34 Correct 33 ms 2148 KB Output is correct
35 Correct 63 ms 2140 KB Output is correct
36 Correct 46 ms 2488 KB Output is correct
37 Correct 50 ms 2784 KB Output is correct
38 Correct 80 ms 2396 KB Output is correct
39 Correct 65 ms 2824 KB Output is correct
40 Correct 55 ms 2784 KB Output is correct
41 Correct 109 ms 2792 KB Output is correct
42 Correct 79 ms 3260 KB Output is correct
43 Correct 69 ms 3196 KB Output is correct
44 Correct 136 ms 3184 KB Output is correct
45 Correct 102 ms 3624 KB Output is correct
46 Correct 82 ms 3616 KB Output is correct
47 Correct 162 ms 3420 KB Output is correct
48 Correct 106 ms 4140 KB Output is correct
49 Correct 101 ms 4108 KB Output is correct
50 Correct 198 ms 4100 KB Output is correct
51 Correct 133 ms 4592 KB Output is correct
52 Correct 119 ms 4608 KB Output is correct
53 Correct 240 ms 4444 KB Output is correct
54 Correct 186 ms 5156 KB Output is correct
55 Correct 137 ms 5172 KB Output is correct
56 Correct 300 ms 5204 KB Output is correct
57 Correct 173 ms 5768 KB Output is correct
58 Correct 162 ms 5764 KB Output is correct
59 Correct 324 ms 5716 KB Output is correct
60 Correct 221 ms 6412 KB Output is correct
61 Correct 181 ms 6388 KB Output is correct
62 Correct 378 ms 6236 KB Output is correct
63 Correct 408 ms 6224 KB Output is correct
64 Correct 529 ms 6392 KB Output is correct
65 Correct 458 ms 6224 KB Output is correct
66 Correct 426 ms 6392 KB Output is correct
67 Correct 414 ms 6484 KB Output is correct
68 Correct 380 ms 6228 KB Output is correct
69 Correct 422 ms 6480 KB Output is correct
70 Correct 374 ms 6416 KB Output is correct
71 Correct 403 ms 6480 KB Output is correct
72 Correct 368 ms 6416 KB Output is correct
73 Correct 387 ms 6692 KB Output is correct
74 Correct 442 ms 6684 KB Output is correct
75 Correct 455 ms 6596 KB Output is correct
76 Correct 463 ms 6740 KB Output is correct
77 Correct 420 ms 6484 KB Output is correct
78 Correct 434 ms 6552 KB Output is correct
79 Correct 419 ms 6656 KB Output is correct
80 Correct 468 ms 6652 KB Output is correct
81 Correct 465 ms 6492 KB Output is correct
82 Correct 469 ms 6656 KB Output is correct
83 Correct 496 ms 6608 KB Output is correct
84 Correct 439 ms 6616 KB Output is correct
85 Correct 492 ms 6616 KB Output is correct
86 Correct 489 ms 6492 KB Output is correct
87 Correct 450 ms 6612 KB Output is correct
88 Correct 486 ms 6552 KB Output is correct
89 Correct 462 ms 6740 KB Output is correct
90 Correct 452 ms 6556 KB Output is correct
91 Correct 509 ms 6556 KB Output is correct
92 Correct 522 ms 6552 KB Output is correct