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Submission #836739

# Submission time Handle Problem Language Result Execution time Memory
836739 2023-08-24T14:42:56 Z vgoofficial Mecho (IOI09_mecho) C++14
100 / 100
 192 ms 8812 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
vector<vector<bool>> maps;
vector<vector<int>> distBees;
int n,s;
pair<int, int> home, start;
vector<int> dx = {0,0,1,-1}, dy = {1,-1,0,0};
struct Compare {
	bool operator()(tuple<int, int, int> a, tuple<int, int, int> b) {
		return get<2>(a)>get<2>(b);
	}
};
void print(vector<vector<int>> v) {
    for(int i = 0; i < v.size(); i++) {
        for(int j = 0; j < v.size(); j++) {
            cout << v[i][j] << " ";
        }
        cout << endl;
    }
    cout << endl;
}
bool possible(int mid) {
    vector<vector<int>> temp = distBees;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) temp[i][j]-=mid;
    }
    //cout << mid << endl;
    //print(temp);
    vector<vector<int>> minDist(n, vector<int>(n, 1000000000));
    minDist[start.first][start.second]=0;
    deque<pair<int, int>> q;
    q.push_back(start);
    while(q.size()) {
        pair<int, int> p = q.front();
        q.pop_front();
        for(int i = 0; i < 4; i++) {
            int newx = p.first+dx[i], newy = p.second+dy[i];
            if(newx>=0&&newy>=0&&newx<n&&newy<n&&maps[newx][newy]&&minDist[newx][newy]==1000000000) {
                if((minDist[p.first][p.second]+1)/s<=temp[newx][newy]) {
                    minDist[newx][newy]=minDist[p.first][p.second]+1;
                    q.push_back({newx, newy});
                }
            }
        }
    }

    return minDist[home.first][home.second]!=1000000000;
}
int main() {
    ios_base::sync_with_stdio(false); 
    cin.tie(0);
    cin >> n >> s;
    deque<pair<int, int>> bee;
    maps=vector<vector<bool>>(n, vector<bool>(n));
    distBees=vector<vector<int>>(n, vector<int>(n, 1000000000));
    for(int i = 0; i < n; i++) {
        string t;
        cin >> t;
        for(int j = 0; j < n; j++) {
            if(t[j]=='G') {
                maps[i][j]=true;
            } else if(t[j]=='M') {
                start={i,j};
                maps[i][j]=true;
            } else if(t[j]=='D') {
                home = {i,j};
            } else if(t[j]=='H') {
                bee.push_back({i,j});
                distBees[i][j]=-1;
            }
        }
    }
    while(bee.size()) {
        pair<int, int> p = bee.front();
        bee.pop_front();
        for(int i = 0; i < 4; i++) {
            int newx = p.first+dx[i], newy = p.second+dy[i];
            if(newx>=0&&newy>=0&&newx<n&&newy<n&&maps[newx][newy]&&distBees[newx][newy]==1000000000) {
                distBees[newx][newy]=distBees[p.first][p.second]+1;
                bee.push_back({newx, newy});
            }
        }
    }
    maps[home.first][home.second]=true;
    //print(distBees);
    int lo = 0, hi = distBees[start.first][start.second];
    if(!possible(0)) {
        cout << -1 << endl;
        return 0;
    }
    while(lo+1<hi) {
        int mid = (lo+hi)/2;
        if(possible(mid)) {
            lo=mid;
        } else {
            hi=mid;
        }
    }
    if(possible(hi)) {
        cout << hi << endl;
    } else {
        cout << lo << endl;
    }
}

Compilation message

mecho.cpp: In function 'void print(std::vector<std::vector<int> >)':
mecho.cpp:15:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for(int i = 0; i < v.size(); i++) {
      |                    ~~^~~~~~~~~~
mecho.cpp:16:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |         for(int j = 0; j < v.size(); j++) {
      |                        ~~^~~~~~~~~~

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 316 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 96 ms 8712 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 320 KB Output is correct
11 Correct 1 ms 316 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 316 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 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 328 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 10 ms 2004 KB Output is correct
34 Correct 8 ms 1948 KB Output is correct
35 Correct 22 ms 1956 KB Output is correct
36 Correct 10 ms 2524 KB Output is correct
37 Correct 11 ms 2380 KB Output is correct
38 Correct 30 ms 2388 KB Output is correct
39 Correct 11 ms 3076 KB Output is correct
40 Correct 13 ms 2996 KB Output is correct
41 Correct 37 ms 3004 KB Output is correct
42 Correct 14 ms 3628 KB Output is correct
43 Correct 16 ms 3692 KB Output is correct
44 Correct 45 ms 3648 KB Output is correct
45 Correct 18 ms 4284 KB Output is correct
46 Correct 20 ms 4372 KB Output is correct
47 Correct 57 ms 4280 KB Output is correct
48 Correct 22 ms 5124 KB Output is correct
49 Correct 23 ms 5112 KB Output is correct
50 Correct 67 ms 5096 KB Output is correct
51 Correct 28 ms 5908 KB Output is correct
52 Correct 27 ms 5844 KB Output is correct
53 Correct 84 ms 5868 KB Output is correct
54 Correct 30 ms 6788 KB Output is correct
55 Correct 31 ms 6820 KB Output is correct
56 Correct 100 ms 6752 KB Output is correct
57 Correct 42 ms 7792 KB Output is correct
58 Correct 37 ms 7884 KB Output is correct
59 Correct 118 ms 7708 KB Output is correct
60 Correct 39 ms 8812 KB Output is correct
61 Correct 42 ms 8732 KB Output is correct
62 Correct 142 ms 8700 KB Output is correct
63 Correct 115 ms 8716 KB Output is correct
64 Correct 192 ms 8692 KB Output is correct
65 Correct 177 ms 8688 KB Output is correct
66 Correct 136 ms 8704 KB Output is correct
67 Correct 29 ms 8660 KB Output is correct
68 Correct 61 ms 8732 KB Output is correct
69 Correct 50 ms 8792 KB Output is correct
70 Correct 50 ms 8728 KB Output is correct
71 Correct 48 ms 8740 KB Output is correct
72 Correct 48 ms 8756 KB Output is correct
73 Correct 33 ms 8732 KB Output is correct
74 Correct 87 ms 8744 KB Output is correct
75 Correct 80 ms 8756 KB Output is correct
76 Correct 74 ms 8804 KB Output is correct
77 Correct 86 ms 8772 KB Output is correct
78 Correct 25 ms 8740 KB Output is correct
79 Correct 80 ms 8732 KB Output is correct
80 Correct 75 ms 8740 KB Output is correct
81 Correct 112 ms 8736 KB Output is correct
82 Correct 81 ms 8784 KB Output is correct
83 Correct 84 ms 8728 KB Output is correct
84 Correct 88 ms 8736 KB Output is correct
85 Correct 85 ms 8736 KB Output is correct
86 Correct 93 ms 8736 KB Output is correct
87 Correct 94 ms 8716 KB Output is correct
88 Correct 90 ms 8708 KB Output is correct
89 Correct 100 ms 8732 KB Output is correct
90 Correct 100 ms 8732 KB Output is correct
91 Correct 102 ms 8796 KB Output is correct
92 Correct 102 ms 8800 KB Output is correct