oj.uz

Submission #245580

# Submission time Handle Problem Language Result Execution time Memory
245580 2020-07-06T20:07:54 Z tatyam Mecho (IOI09_mecho) C++17
100 / 100
 218 ms 6908 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 {
        if(bee[start.first][start.second] <= v) return false;
        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 = 0x1fffff;
    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 5 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 6 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 119 ms 6792 KB Output is correct
8 Correct 6 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 6 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 5 ms 384 KB Output is correct
16 Correct 6 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 5 ms 512 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 12 ms 1656 KB Output is correct
34 Correct 10 ms 1656 KB Output is correct
35 Correct 30 ms 1636 KB Output is correct
36 Correct 10 ms 2044 KB Output is correct
37 Correct 11 ms 2028 KB Output is correct
38 Correct 39 ms 2044 KB Output is correct
39 Correct 12 ms 2408 KB Output is correct
40 Correct 12 ms 2440 KB Output is correct
41 Correct 46 ms 2444 KB Output is correct
42 Correct 15 ms 2936 KB Output is correct
43 Correct 16 ms 2912 KB Output is correct
44 Correct 59 ms 2892 KB Output is correct
45 Correct 16 ms 3408 KB Output is correct
46 Correct 15 ms 3432 KB Output is correct
47 Correct 84 ms 3764 KB Output is correct
48 Correct 20 ms 4032 KB Output is correct
49 Correct 21 ms 4032 KB Output is correct
50 Correct 88 ms 4032 KB Output is correct
51 Correct 22 ms 4608 KB Output is correct
52 Correct 22 ms 4608 KB Output is correct
53 Correct 109 ms 4708 KB Output is correct
54 Correct 28 ms 5372 KB Output is correct
55 Correct 29 ms 5344 KB Output is correct
56 Correct 121 ms 5292 KB Output is correct
57 Correct 29 ms 6008 KB Output is correct
58 Correct 25 ms 6136 KB Output is correct
59 Correct 141 ms 6096 KB Output is correct
60 Correct 32 ms 6800 KB Output is correct
61 Correct 34 ms 6800 KB Output is correct
62 Correct 170 ms 6804 KB Output is correct
63 Correct 137 ms 6868 KB Output is correct
64 Correct 218 ms 6776 KB Output is correct
65 Correct 215 ms 6776 KB Output is correct
66 Correct 170 ms 6812 KB Output is correct
67 Correct 157 ms 6804 KB Output is correct
68 Correct 81 ms 6808 KB Output is correct
69 Correct 62 ms 6808 KB Output is correct
70 Correct 53 ms 6800 KB Output is correct
71 Correct 47 ms 6764 KB Output is correct
72 Correct 38 ms 6776 KB Output is correct
73 Correct 41 ms 6652 KB Output is correct
74 Correct 81 ms 6796 KB Output is correct
75 Correct 92 ms 6892 KB Output is correct
76 Correct 92 ms 6824 KB Output is correct
77 Correct 92 ms 6788 KB Output is correct
78 Correct 101 ms 6904 KB Output is correct
79 Correct 70 ms 6776 KB Output is correct
80 Correct 81 ms 6832 KB Output is correct
81 Correct 96 ms 6792 KB Output is correct
82 Correct 83 ms 6776 KB Output is correct
83 Correct 107 ms 6788 KB Output is correct
84 Correct 98 ms 6792 KB Output is correct
85 Correct 91 ms 6792 KB Output is correct
86 Correct 100 ms 6788 KB Output is correct
87 Correct 95 ms 6792 KB Output is correct
88 Correct 111 ms 6804 KB Output is correct
89 Correct 105 ms 6868 KB Output is correct
90 Correct 116 ms 6844 KB Output is correct
91 Correct 112 ms 6764 KB Output is correct
92 Correct 104 ms 6908 KB Output is correct