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Submission #928829

# Submission time Handle Problem Language Result Execution time Memory
928829 2024-02-17T06:25:25 Z absolutePi Mecho (IOI09_mecho) C++17
95 / 100
 503 ms 7200 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)&&vism[newx][newy]){
                reached=true;
            }
        }
        if(reached){
            l=eating_time+1;
        }
        else{
            r=eating_time-1;
        }
    }
    cout << l-1 << '\n';
}

Subtask #1
95.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 860 KB Output is correct
2 Correct 1 ms 1112 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 860 KB Output is correct
6 Correct 1 ms 860 KB Output is correct
7 Correct 438 ms 6500 KB Output is correct
8 Correct 1 ms 1096 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 Incorrect 2 ms 1112 KB Output isn't correct
13 Correct 3 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 1 ms 932 KB Output is correct
20 Correct 1 ms 860 KB Output is correct
21 Correct 1 ms 1116 KB Output is correct
22 Correct 1 ms 860 KB Output is correct
23 Correct 1 ms 1116 KB Output is correct
24 Correct 1 ms 1116 KB Output is correct
25 Correct 2 ms 1116 KB Output is correct
26 Correct 2 ms 1116 KB Output is correct
27 Correct 2 ms 1116 KB Output is correct
28 Correct 2 ms 1116 KB Output is correct
29 Correct 2 ms 1116 KB Output is correct
30 Correct 2 ms 1116 KB Output is correct
31 Correct 3 ms 1116 KB Output is correct
32 Correct 2 ms 1116 KB Output is correct
33 Correct 36 ms 2184 KB Output is correct
34 Correct 32 ms 2356 KB Output is correct
35 Correct 65 ms 2140 KB Output is correct
36 Correct 50 ms 2508 KB Output is correct
37 Correct 44 ms 2488 KB Output is correct
38 Correct 81 ms 2396 KB Output is correct
39 Correct 56 ms 2812 KB Output is correct
40 Correct 55 ms 2808 KB Output is correct
41 Correct 118 ms 2808 KB Output is correct
42 Correct 74 ms 3204 KB Output is correct
43 Correct 69 ms 3232 KB Output is correct
44 Correct 136 ms 3188 KB Output is correct
45 Correct 94 ms 3608 KB Output is correct
46 Correct 82 ms 3624 KB Output is correct
47 Correct 159 ms 3608 KB Output is correct
48 Correct 104 ms 4100 KB Output is correct
49 Correct 101 ms 4100 KB Output is correct
50 Correct 188 ms 3932 KB Output is correct
51 Correct 131 ms 4628 KB Output is correct
52 Correct 119 ms 4608 KB Output is correct
53 Correct 243 ms 4688 KB Output is correct
54 Correct 151 ms 5180 KB Output is correct
55 Correct 138 ms 5144 KB Output is correct
56 Correct 305 ms 5292 KB Output is correct
57 Correct 172 ms 5760 KB Output is correct
58 Correct 158 ms 5784 KB Output is correct
59 Correct 328 ms 5972 KB Output is correct
60 Correct 208 ms 6388 KB Output is correct
61 Correct 187 ms 6428 KB Output is correct
62 Correct 361 ms 6208 KB Output is correct
63 Correct 409 ms 6480 KB Output is correct
64 Correct 503 ms 6228 KB Output is correct
65 Correct 450 ms 6480 KB Output is correct
66 Correct 425 ms 6392 KB Output is correct
67 Correct 412 ms 6460 KB Output is correct
68 Correct 394 ms 6232 KB Output is correct
69 Correct 402 ms 6432 KB Output is correct
70 Correct 377 ms 6420 KB Output is correct
71 Correct 394 ms 6416 KB Output is correct
72 Correct 371 ms 6232 KB Output is correct
73 Correct 408 ms 6600 KB Output is correct
74 Correct 425 ms 7200 KB Output is correct
75 Correct 445 ms 6688 KB Output is correct
76 Correct 416 ms 6700 KB Output is correct
77 Correct 407 ms 6480 KB Output is correct
78 Correct 429 ms 6784 KB Output is correct
79 Correct 407 ms 6624 KB Output is correct
80 Correct 404 ms 6652 KB Output is correct
81 Correct 411 ms 6484 KB Output is correct
82 Correct 410 ms 6848 KB Output is correct
83 Correct 419 ms 6612 KB Output is correct
84 Correct 419 ms 6480 KB Output is correct
85 Correct 442 ms 6620 KB Output is correct
86 Correct 417 ms 6480 KB Output is correct
87 Correct 429 ms 6872 KB Output is correct
88 Correct 424 ms 6488 KB Output is correct
89 Correct 432 ms 6740 KB Output is correct
90 Correct 435 ms 6552 KB Output is correct
91 Correct 434 ms 6492 KB Output is correct
92 Correct 458 ms 6552 KB Output is correct