oj.uz

Submission #245583

# Submission time Handle Problem Language Result Execution time Memory
245583 2020-07-06T20:09:52 Z tatyam Mecho (IOI09_mecho) C++17
100 / 100
 227 ms 6272 KB 
#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
const int INF = 0x3fffffff;
const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};
#define name2(a,b,c,...) c
#define rep1(b) for(int i = 0; i < b; i++)
#define rep2(i,b) for(int i = 0; i < b; i++)
#define rep(...) name2(__VA_ARGS__,rep2,rep1)(__VA_ARGS__)
#define each(i,a) for(auto&& i : a)
template<class T, class U> bool chmin(T& a, const U& b){ if(a > b){ a = b; return 1; } return 0; }
template<class T, class U> bool chmax(T& a, const U& b){ if(a < b){ a = b; return 1; } return 0; }
 
 
int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n, s;
    cin >> n >> s;
    vector<string> a(n);
    each(i, a) cin >> i;
    vector<vector<int>> bee(n, vector<int>(n, INF));
    queue<pii> q;
    rep(n) rep(j, n) if(a[i][j] == 'H'){
        bee[i][j] = 0;
        q.emplace(i, j);
    }
    while(q.size()){
        auto [x, y] = q.front();
        q.pop();
        rep(4){
            int x2 = x + dx[i], y2 = y + dy[i];
            if(x2 < 0 || y2 < 0 || x2 >= n || y2 >= n || a[x2][y2] != 'G' && a[x2][y2] != 'M') continue;
            if(chmin(bee[x2][y2], bee[x][y] + 1)) q.emplace(x2, y2);
        }
    }
    pii start, goal;
    rep(n) rep(j, n) if(a[i][j] == 'M') start = {i, j};
    rep(n) rep(j, n) if(a[i][j] == 'D') goal = {i, j};
    auto check = [&](int v) -> bool {
        vector<vector<int>> m(n, vector<int>(n, INF));
        m[start.first][start.second] = 0;
        q.push(start);
        while(q.size()){
            auto [x, y] = q.front();
            q.pop();
            int next = m[x][y] + 1;
            rep(4){
                int x2 = x + dx[i], y2 = y + dy[i];
                if(x2 < 0 || y2 < 0 || x2 >= n || y2 >= n || a[x2][y2] == 'T') continue;
                if(next / s + v < bee[x2][y2] && chmin(m[x2][y2], next)) q.emplace(x2, y2);
            }
        }
        return m[goal.first][goal.second] != INF;
    };
    int ok = -1, ng = bee[start.first][start.second];
    while(ng - ok > 1){
        int cen = (ok + ng) / 2;
        if(check(cen)) ok = cen;
        else ng = cen;
    }
    cout << ok << endl;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:34:75: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
             if(x2 < 0 || y2 < 0 || x2 >= n || y2 >= n || a[x2][y2] != 'G' && a[x2][y2] != 'M') continue;

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 114 ms 6156 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 4 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 4 ms 384 KB Output is correct
19 Correct 4 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 5 ms 384 KB Output is correct
26 Correct 5 ms 384 KB Output is correct
27 Correct 5 ms 384 KB Output is correct
28 Correct 5 ms 384 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 5 ms 384 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 10 ms 1560 KB Output is correct
34 Correct 11 ms 1560 KB Output is correct
35 Correct 25 ms 1500 KB Output is correct
36 Correct 13 ms 1884 KB Output is correct
37 Correct 14 ms 1792 KB Output is correct
38 Correct 38 ms 1884 KB Output is correct
39 Correct 15 ms 2256 KB Output is correct
40 Correct 16 ms 2224 KB Output is correct
41 Correct 45 ms 2224 KB Output is correct
42 Correct 17 ms 2696 KB Output is correct
43 Correct 19 ms 2724 KB Output is correct
44 Correct 55 ms 2692 KB Output is correct
45 Correct 20 ms 3168 KB Output is correct
46 Correct 22 ms 3108 KB Output is correct
47 Correct 66 ms 3136 KB Output is correct
48 Correct 23 ms 3648 KB Output is correct
49 Correct 25 ms 3712 KB Output is correct
50 Correct 77 ms 3632 KB Output is correct
51 Correct 28 ms 4188 KB Output is correct
52 Correct 29 ms 4208 KB Output is correct
53 Correct 91 ms 4200 KB Output is correct
54 Correct 32 ms 4832 KB Output is correct
55 Correct 33 ms 4852 KB Output is correct
56 Correct 117 ms 4816 KB Output is correct
57 Correct 36 ms 5480 KB Output is correct
58 Correct 38 ms 5488 KB Output is correct
59 Correct 129 ms 5452 KB Output is correct
60 Correct 40 ms 6152 KB Output is correct
61 Correct 44 ms 6272 KB Output is correct
62 Correct 169 ms 6136 KB Output is correct
63 Correct 136 ms 6156 KB Output is correct
64 Correct 227 ms 6164 KB Output is correct
65 Correct 223 ms 6164 KB Output is correct
66 Correct 156 ms 6204 KB Output is correct
67 Correct 144 ms 6272 KB Output is correct
68 Correct 63 ms 6176 KB Output is correct
69 Correct 56 ms 6160 KB Output is correct
70 Correct 51 ms 6168 KB Output is correct
71 Correct 44 ms 6184 KB Output is correct
72 Correct 44 ms 6208 KB Output is correct
73 Correct 50 ms 6136 KB Output is correct
74 Correct 86 ms 6236 KB Output is correct
75 Correct 81 ms 6152 KB Output is correct
76 Correct 85 ms 6180 KB Output is correct
77 Correct 90 ms 6144 KB Output is correct
78 Correct 113 ms 6228 KB Output is correct
79 Correct 77 ms 6200 KB Output is correct
80 Correct 83 ms 6200 KB Output is correct
81 Correct 90 ms 6152 KB Output is correct
82 Correct 82 ms 6144 KB Output is correct
83 Correct 108 ms 6272 KB Output is correct
84 Correct 89 ms 6148 KB Output is correct
85 Correct 89 ms 6156 KB Output is correct
86 Correct 107 ms 6152 KB Output is correct
87 Correct 91 ms 6160 KB Output is correct
88 Correct 106 ms 6184 KB Output is correct
89 Correct 104 ms 6160 KB Output is correct
90 Correct 115 ms 6152 KB Output is correct
91 Correct 114 ms 6148 KB Output is correct
92 Correct 115 ms 6240 KB Output is correct