oj.uz

Submission #482481

# Submission time Handle Problem Language Result Execution time Memory
482481 2021-10-24T18:02:03 Z asdf1234coding Mecho (IOI09_mecho) C++14
100 / 100
 179 ms 6292 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
using namespace std;
#define ll long long
#define MOD (ll) (1e9+7)
#define pii pair<int,int>
#define ff first
#define ss second

int n,s; 
pii start,finish;
string board[801];
vector<vector<int>> beedist(801, vector<int>(801, -1));
queue<pii> bees;

int dx[4] = {0, 0, 1, -1};
int dy[4] = {1, -1, 0, 0};

bool inBounds(pii asdf) {
    int x=asdf.ff; int y=asdf.ss;
    return (x>=0 && x<n && y>=0 && y<n && board[x][y]!='T');
}

void beeDist() {
    while(!bees.empty()) {
        auto curr = bees.front(); bees.pop();
        for(int i=0; i<4; i++) {
            pii next = {curr.first+dx[i], curr.second+dy[i]};
            if(inBounds(next) && beedist[next.ff][next.ss] == -1 && board[next.ff][next.ss]!='D') {
                beedist[next.ff][next.ss] = beedist[curr.ff][curr.ss] + s;
                bees.push(next);
            }
        }
    }
}

bool test(int delay) {
    vector<vector<int>> dist(801, vector<int>(801, -1));
    if(delay*s>=beedist[start.ff][start.ss]) {
        return false;
    }
    queue<pii> q; q.push(start);
    dist[start.ff][start.ss] = delay*s;
    while(!q.empty()) {
        auto curr = q.front(); q.pop();
        if(curr == finish) {
            return true;
        }
        for(int i=0; i<4; i++) {
            pii next = {curr.ff+dx[i], curr.ss+dy[i]};
            if(inBounds(next)&&((dist[curr.ff][curr.ss]+1)<beedist[next.ff][next.ss])&&dist[next.ff][next.ss]==-1) {
                dist[next.ff][next.ss] = dist[curr.ff][curr.ss]+1;
                q.push(next);
            }
        }
    }
    return false;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin>>n>>s;
    for(int i=0; i<n; i++) {
        cin>>board[i];
        for(int j=0; j<n; j++) {
            if(board[i][j] == 'M') {
                start.ff = i;
                start.ss = j;
            } else if (board[i][j] == 'D') {
                finish.ff = i;
                finish.ss = j;
            } else if (board[i][j] == 'H') {
                beedist[i][j] = 0;
                bees.push({i,j});
            }
        }
    }

    beeDist();
    // for(int i=0; i<n; i++) {
    //     for(int j=0; j<n; j++) {
    //         cout<<beedist[i][j]<<' ';
    //     }
    //     cout<<endl;
    // }
    // cout<<test(0)<<endl;
    // cout<<test(1)<<endl;
    // cout<<test(2)<<endl;
    // cout<<test(3)<<endl;

    beedist[finish.ff][finish.ss] = n*n*s;

    //binsearch :D
    int lo = -1; int hi = 2*n*n;
    while(hi-lo>1) {
        int mid = (lo+hi)>>1;
        if(test(mid)) {
            lo = mid;
        } else {
            hi = mid;
        }
    }
    cout<<lo<<endl;
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5404 KB Output is correct
2 Correct 7 ms 5424 KB Output is correct
3 Correct 7 ms 5404 KB Output is correct
4 Correct 6 ms 5432 KB Output is correct
5 Correct 8 ms 5392 KB Output is correct
6 Correct 8 ms 5424 KB Output is correct
7 Correct 74 ms 6132 KB Output is correct
8 Correct 8 ms 5424 KB Output is correct
9 Correct 8 ms 5424 KB Output is correct
10 Correct 9 ms 5404 KB Output is correct
11 Correct 8 ms 5424 KB Output is correct
12 Correct 11 ms 5460 KB Output is correct
13 Correct 11 ms 5444 KB Output is correct
14 Correct 12 ms 5444 KB Output is correct
15 Correct 9 ms 5432 KB Output is correct
16 Correct 9 ms 5444 KB Output is correct
17 Correct 9 ms 5484 KB Output is correct
18 Correct 10 ms 5444 KB Output is correct
19 Correct 10 ms 5444 KB Output is correct
20 Correct 10 ms 5484 KB Output is correct
21 Correct 13 ms 5500 KB Output is correct
22 Correct 13 ms 5460 KB Output is correct
23 Correct 11 ms 5460 KB Output is correct
24 Correct 10 ms 5460 KB Output is correct
25 Correct 12 ms 5460 KB Output is correct
26 Correct 11 ms 5440 KB Output is correct
27 Correct 15 ms 5452 KB Output is correct
28 Correct 13 ms 5468 KB Output is correct
29 Correct 12 ms 5456 KB Output is correct
30 Correct 12 ms 5456 KB Output is correct
31 Correct 12 ms 5460 KB Output is correct
32 Correct 12 ms 5460 KB Output is correct
33 Correct 15 ms 5580 KB Output is correct
34 Correct 17 ms 5604 KB Output is correct
35 Correct 29 ms 5604 KB Output is correct
36 Correct 16 ms 5640 KB Output is correct
37 Correct 18 ms 5636 KB Output is correct
38 Correct 33 ms 5640 KB Output is correct
39 Correct 20 ms 5688 KB Output is correct
40 Correct 17 ms 5692 KB Output is correct
41 Correct 40 ms 5668 KB Output is correct
42 Correct 18 ms 5736 KB Output is correct
43 Correct 19 ms 5740 KB Output is correct
44 Correct 49 ms 5704 KB Output is correct
45 Correct 20 ms 5788 KB Output is correct
46 Correct 18 ms 5760 KB Output is correct
47 Correct 52 ms 5752 KB Output is correct
48 Correct 20 ms 5936 KB Output is correct
49 Correct 21 ms 5872 KB Output is correct
50 Correct 71 ms 5876 KB Output is correct
51 Correct 20 ms 5972 KB Output is correct
52 Correct 20 ms 5940 KB Output is correct
53 Correct 84 ms 5920 KB Output is correct
54 Correct 22 ms 6020 KB Output is correct
55 Correct 21 ms 6020 KB Output is correct
56 Correct 79 ms 5988 KB Output is correct
57 Correct 22 ms 6160 KB Output is correct
58 Correct 22 ms 6056 KB Output is correct
59 Correct 98 ms 6044 KB Output is correct
60 Correct 24 ms 6156 KB Output is correct
61 Correct 23 ms 6132 KB Output is correct
62 Correct 133 ms 6092 KB Output is correct
63 Correct 99 ms 6120 KB Output is correct
64 Correct 179 ms 6108 KB Output is correct
65 Correct 157 ms 6116 KB Output is correct
66 Correct 114 ms 6116 KB Output is correct
67 Correct 108 ms 6116 KB Output is correct
68 Correct 62 ms 6124 KB Output is correct
69 Correct 53 ms 6132 KB Output is correct
70 Correct 41 ms 6152 KB Output is correct
71 Correct 48 ms 6228 KB Output is correct
72 Correct 43 ms 6152 KB Output is correct
73 Correct 35 ms 6184 KB Output is correct
74 Correct 58 ms 6176 KB Output is correct
75 Correct 70 ms 6156 KB Output is correct
76 Correct 63 ms 6152 KB Output is correct
77 Correct 58 ms 6172 KB Output is correct
78 Correct 71 ms 6148 KB Output is correct
79 Correct 48 ms 6292 KB Output is correct
80 Correct 57 ms 6168 KB Output is correct
81 Correct 64 ms 6168 KB Output is correct
82 Correct 54 ms 6152 KB Output is correct
83 Correct 70 ms 6156 KB Output is correct
84 Correct 65 ms 6144 KB Output is correct
85 Correct 72 ms 6148 KB Output is correct
86 Correct 76 ms 6244 KB Output is correct
87 Correct 67 ms 6164 KB Output is correct
88 Correct 71 ms 6128 KB Output is correct
89 Correct 72 ms 6144 KB Output is correct
90 Correct 78 ms 6184 KB Output is correct
91 Correct 85 ms 6128 KB Output is correct
92 Correct 92 ms 6208 KB Output is correct