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Submission #395553

# Submission time Handle Problem Language Result Execution time Memory
395553 2021-04-28T13:33:15 Z AugustinasJucas Mecho (IOI09_mecho) C++14
89 / 100
 264 ms 8520 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;
        }
    }
    if(X / S >= dist[sE][sS]) return false;
    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 = 1e9, 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
89.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4304 KB Output is correct
2 Correct 3 ms 4300 KB Output is correct
3 Correct 3 ms 4300 KB Output is correct
4 Correct 3 ms 4300 KB Output is correct
5 Correct 3 ms 4300 KB Output is correct
6 Correct 3 ms 4300 KB Output is correct
7 Correct 155 ms 8336 KB Output is correct
8 Correct 3 ms 4300 KB Output is correct
9 Correct 3 ms 4300 KB Output is correct
10 Correct 3 ms 4300 KB Output is correct
11 Correct 4 ms 4300 KB Output is correct
12 Correct 3 ms 4556 KB Output is correct
13 Incorrect 3 ms 4428 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 4 ms 4300 KB Output is correct
17 Correct 4 ms 4428 KB Output is correct
18 Correct 3 ms 4428 KB Output is correct
19 Correct 3 ms 4428 KB Output is correct
20 Correct 3 ms 4428 KB Output is correct
21 Correct 3 ms 4496 KB Output is correct
22 Correct 3 ms 4428 KB Output is correct
23 Correct 3 ms 4428 KB Output is correct
24 Correct 4 ms 4428 KB Output is correct
25 Correct 4 ms 4556 KB Output is correct
26 Correct 3 ms 4556 KB Output is correct
27 Correct 4 ms 4556 KB Output is correct
28 Correct 3 ms 4556 KB Output is correct
29 Correct 3 ms 4556 KB Output is correct
30 Correct 4 ms 4556 KB Output is correct
31 Correct 4 ms 4556 KB Output is correct
32 Correct 4 ms 4556 KB Output is correct
33 Correct 16 ms 5924 KB Output is correct
34 Correct 19 ms 6016 KB Output is correct
35 Correct 39 ms 5964 KB Output is correct
36 Correct 18 ms 6204 KB Output is correct
37 Correct 18 ms 6236 KB Output is correct
38 Correct 48 ms 6264 KB Output is correct
39 Correct 23 ms 6532 KB Output is correct
40 Correct 23 ms 6476 KB Output is correct
41 Correct 60 ms 6500 KB Output is correct
42 Correct 26 ms 6716 KB Output is correct
43 Correct 26 ms 6664 KB Output is correct
44 Correct 80 ms 6772 KB Output is correct
45 Correct 31 ms 6980 KB Output is correct
46 Correct 31 ms 6916 KB Output is correct
47 Correct 96 ms 6952 KB Output is correct
48 Correct 39 ms 7220 KB Output is correct
49 Correct 43 ms 7164 KB Output is correct
50 Correct 113 ms 7328 KB Output is correct
51 Correct 43 ms 7448 KB Output is correct
52 Correct 45 ms 7460 KB Output is correct
53 Correct 136 ms 7508 KB Output is correct
54 Correct 59 ms 7700 KB Output is correct
55 Correct 54 ms 7748 KB Output is correct
56 Correct 155 ms 7748 KB Output is correct
57 Correct 57 ms 7988 KB Output is correct
58 Correct 54 ms 7936 KB Output is correct
59 Correct 182 ms 7988 KB Output is correct
60 Correct 61 ms 8224 KB Output is correct
61 Correct 62 ms 8144 KB Output is correct
62 Correct 211 ms 8240 KB Output is correct
63 Correct 159 ms 8132 KB Output is correct
64 Correct 240 ms 8208 KB Output is correct
65 Correct 264 ms 8260 KB Output is correct
66 Correct 174 ms 8132 KB Output is correct
67 Correct 166 ms 8152 KB Output is correct
68 Correct 96 ms 8156 KB Output is correct
69 Correct 94 ms 8288 KB Output is correct
70 Correct 77 ms 8172 KB Output is correct
71 Correct 80 ms 8260 KB Output is correct
72 Incorrect 78 ms 8180 KB Output isn't correct
73 Incorrect 81 ms 8512 KB Output isn't correct
74 Correct 116 ms 8432 KB Output is correct
75 Correct 129 ms 8516 KB Output is correct
76 Correct 119 ms 8520 KB Output is correct
77 Correct 125 ms 8420 KB Output is correct
78 Correct 135 ms 8416 KB Output is correct
79 Correct 114 ms 8388 KB Output is correct
80 Correct 128 ms 8492 KB Output is correct
81 Correct 135 ms 8400 KB Output is correct
82 Correct 117 ms 8452 KB Output is correct
83 Correct 149 ms 8388 KB Output is correct
84 Correct 130 ms 8388 KB Output is correct
85 Correct 134 ms 8432 KB Output is correct
86 Correct 144 ms 8488 KB Output is correct
87 Correct 143 ms 8344 KB Output is correct
88 Correct 150 ms 8400 KB Output is correct
89 Correct 145 ms 8280 KB Output is correct
90 Correct 152 ms 8388 KB Output is correct
91 Correct 150 ms 8436 KB Output is correct
92 Correct 151 ms 8400 KB Output is correct