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Submission #395546

# Submission time Handle Problem Language Result Execution time Memory
395546 2021-04-28T13:28:00 Z AugustinasJucas Mecho (IOI09_mecho) C++14
64 / 100
 226 ms 9144 KB 
#include <bits/stdc++.h>
using namespace std;
const int dydis = 1e3 + 10;
const int inf = 1e9;
int n, S;
char mas[dydis][dydis];
int dist[dydis][dydis];
vector<pair<int, int> > dir = {{-1, 0}, {1, 0}, {0, 1}, {0, -1}};
void bfs(){
    for(int i = 0; i < dydis; i++) for(int j = 0; j < dydis; j++) dist[i][j] = inf;
    queue<pair<int, int> > q;
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            if(mas[i][j] != 'H') continue;
            dist[i][j] = 0;
            q.push({i, j});
        }
    }
    while(!q.empty()){
        int e = q.front().first;
        int s = q.front().second;
        int pe, ps;
        q.pop();
        for(auto x : dir){
            pe = x.first + e;
            ps = x.second + s;
            if(pe < 0 || ps < 0 || pe >= n || ps >= n) continue;
            if(mas[pe][ps] == 'D' || mas[pe][ps] == 'T') continue;
            if(dist[pe][ps] > dist[e][s] + 1){
                dist[pe][ps] = dist[e][s] + 1;
                q.push({pe, ps});
            }
        }
    }
}
int d[dydis][dydis];
int sE, sS, eE, eS;
bool f(int X){
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            d[i][j] = inf;
        }
    }
    queue<pair<int, int> > q;
    d[sE][sS] = 0;
    q.push({sE, sS});
    while(!q.empty()){
        int e = q.front().first;
        int s = q.front().second;
        int pe, ps;
        q.pop();
        for(auto x : dir){
            pe = e + x.first;
            ps = s + x.second;
            if(pe < 0 || ps < 0 || pe >= n || ps >= n) continue;
            if(mas[pe][ps] == 'H' || mas[pe][ps] == 'T') continue;
            int bus = d[e][s] + 1;
            int b1 = bus / S;
            if(b1 >= dist[pe][ps] - X) continue;
            if(d[pe][ps] > bus){
                d[pe][ps] = bus;
                q.push({pe, ps});
            }
        }
    }
    return d[eE][eS] < inf;
}
int main(){
    cin >> n >> S;
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            cin >> mas[i][j];
            if(mas[i][j] == 'M') sE = i, sS = j;
            if(mas[i][j] == 'D') eE = i, eS = j;

        }
    }
    bfs();
    int l = 0, r = 1e5, mid, ans = -1; 
    while(l <= r){
        mid = (l + r) / 2;
        if(f(mid)){
            ans = max(ans, mid);
            l = mid+1;
        }else{
            r = mid-1;
        }
    }
    cout << ans;
    return 0;
}

Subtask #1
64.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4300 KB Output is correct
2 Correct 3 ms 4300 KB Output is correct
3 Correct 3 ms 4280 KB Output is correct
4 Correct 3 ms 4276 KB Output is correct
5 Correct 3 ms 4300 KB Output is correct
6 Correct 3 ms 4300 KB Output is correct
7 Correct 159 ms 8900 KB Output is correct
8 Correct 3 ms 4300 KB Output is correct
9 Correct 3 ms 4268 KB Output is correct
10 Correct 3 ms 4300 KB Output is correct
11 Correct 3 ms 4300 KB Output is correct
12 Incorrect 4 ms 4556 KB Output isn't correct
13 Incorrect 3 ms 4560 KB Output isn't correct
14 Correct 4 ms 4556 KB Output is correct
15 Correct 3 ms 4300 KB Output is correct
16 Correct 3 ms 4300 KB Output is correct
17 Correct 3 ms 4428 KB Output is correct
18 Correct 3 ms 4428 KB Output is correct
19 Correct 3 ms 4440 KB Output is correct
20 Correct 3 ms 4428 KB Output is correct
21 Correct 3 ms 4428 KB Output is correct
22 Correct 3 ms 4432 KB Output is correct
23 Correct 4 ms 4428 KB Output is correct
24 Correct 3 ms 4432 KB Output is correct
25 Correct 3 ms 4556 KB Output is correct
26 Correct 3 ms 4556 KB Output is correct
27 Correct 3 ms 4556 KB Output is correct
28 Correct 3 ms 4556 KB Output is correct
29 Correct 4 ms 4556 KB Output is correct
30 Correct 4 ms 4560 KB Output is correct
31 Correct 4 ms 4684 KB Output is correct
32 Correct 4 ms 4684 KB Output is correct
33 Correct 14 ms 6092 KB Output is correct
34 Correct 14 ms 6124 KB Output is correct
35 Correct 37 ms 6136 KB Output is correct
36 Correct 18 ms 6392 KB Output is correct
37 Correct 18 ms 6356 KB Output is correct
38 Correct 51 ms 6436 KB Output is correct
39 Incorrect 24 ms 6608 KB Output isn't correct
40 Correct 23 ms 6668 KB Output is correct
41 Correct 65 ms 6604 KB Output is correct
42 Incorrect 32 ms 6980 KB Output isn't correct
43 Correct 28 ms 6964 KB Output is correct
44 Correct 78 ms 6964 KB Output is correct
45 Incorrect 44 ms 7292 KB Output isn't correct
46 Correct 32 ms 7244 KB Output is correct
47 Correct 94 ms 7236 KB Output is correct
48 Incorrect 55 ms 7620 KB Output isn't correct
49 Correct 37 ms 7500 KB Output is correct
50 Correct 114 ms 7612 KB Output is correct
51 Incorrect 69 ms 7828 KB Output isn't correct
52 Incorrect 49 ms 7900 KB Output isn't correct
53 Correct 132 ms 7920 KB Output is correct
54 Incorrect 83 ms 8140 KB Output isn't correct
55 Incorrect 72 ms 8268 KB Output isn't correct
56 Correct 151 ms 8148 KB Output is correct
57 Incorrect 100 ms 8536 KB Output isn't correct
58 Incorrect 96 ms 8524 KB Output isn't correct
59 Correct 180 ms 8476 KB Output is correct
60 Incorrect 116 ms 8864 KB Output isn't correct
61 Incorrect 114 ms 8756 KB Output isn't correct
62 Correct 213 ms 8936 KB Output is correct
63 Correct 156 ms 8872 KB Output is correct
64 Correct 226 ms 8868 KB Output is correct
65 Correct 217 ms 8916 KB Output is correct
66 Correct 170 ms 8752 KB Output is correct
67 Correct 173 ms 8776 KB Output is correct
68 Correct 95 ms 8904 KB Output is correct
69 Correct 81 ms 8792 KB Output is correct
70 Correct 80 ms 8868 KB Output is correct
71 Correct 82 ms 8916 KB Output is correct
72 Incorrect 76 ms 8852 KB Output isn't correct
73 Incorrect 79 ms 9048 KB Output isn't correct
74 Correct 109 ms 9144 KB Output is correct
75 Correct 119 ms 9028 KB Output is correct
76 Correct 118 ms 9120 KB Output is correct
77 Correct 122 ms 9144 KB Output is correct
78 Correct 140 ms 9028 KB Output is correct
79 Correct 121 ms 9028 KB Output is correct
80 Correct 114 ms 9116 KB Output is correct
81 Correct 125 ms 9028 KB Output is correct
82 Correct 118 ms 9116 KB Output is correct
83 Correct 150 ms 8972 KB Output is correct
84 Correct 132 ms 9028 KB Output is correct
85 Correct 140 ms 9092 KB Output is correct
86 Correct 132 ms 9032 KB Output is correct
87 Correct 140 ms 9080 KB Output is correct
88 Correct 147 ms 9008 KB Output is correct
89 Correct 144 ms 9028 KB Output is correct
90 Correct 143 ms 9032 KB Output is correct
91 Correct 150 ms 8996 KB Output is correct
92 Correct 139 ms 9028 KB Output is correct