oj.uz

Submission #396875

# Submission time Handle Problem Language Result Execution time Memory
396875 2021-04-30T21:07:55 Z rocks03 Mecho (IOI09_mecho) C++14
100 / 100
 196 ms 9004 KB 
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define ff first
#define ss second
#define pb push_back
#define SZ(x) ((int)(x).size())
#define all(x) x.begin(), x.end()
#define debug(x) cout << #x << ": " << x << " "
#define nl cout << "\n"
#define rep(i, a, b) for(int i = (a); i < (b); i++)
#define per(i, a, b) for(int i = (a); i >= (b); i--)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int dx[] = {-1, +1, 0, 0};
int dy[] = {0, 0, -1, +1};

const int MAXN = 1e3+100;
int N, S, sx, sy, ex, ey, d[MAXN][MAXN], D[MAXN][MAXN];
char mat[MAXN][MAXN];

bool valid(int x, int y){
    return (x >= 0 && x < N && y >= 0 && y < N && mat[x][y] != 'T');
}

bool check(int mid){
    if(mid >= d[sx][sy]){
        return false;
    }
    rep(i, 0, N){
        rep(j, 0, N){
            D[i][j] = INT_MAX;
        }
    }
    D[sx][sy] = 0;
    queue<pii> q;
    q.push({sx, sy});
    while(!q.empty()){
        auto [x, y] = q.front();
        q.pop();
        int dist = (D[x][y] + 1) / S;
        rep(i, 0, 4){
            int x2 = x + dx[i], y2 = y + dy[i];
            if(valid(x2, y2) && D[x2][y2] == INT_MAX && d[x2][y2] > dist + mid){
                D[x2][y2] = D[x][y] + 1;
                q.push({x2, y2});
            }
        }
    }
    if(D[ex][ey] != INT_MAX)
        return true;
    return false;
}

void solve(){
    cin >> N >> S;
    queue<pii> q;
    rep(i, 0, N){
        string s; cin >> s;
        rep(j, 0, N){
            char c = mat[i][j] = s[j];
            d[i][j] = INT_MAX;
            if(c == 'H'){
                d[i][j] = 0;
                q.push({i, j});
            }
            if(c == 'M'){
                sx = i, sy = j;
            }
            if(c == 'D'){
                ex = i, ey = j;
            }
        }
    }
    while(!q.empty()){
        auto [x, y] = q.front();
        q.pop();
        rep(i, 0, 4){
            int x2 = x + dx[i], y2 = y + dy[i];
            if(valid(x2, y2) && d[x2][y2] == INT_MAX && mat[x2][y2] != 'D'){
                d[x2][y2] = d[x][y] + 1;
                q.push({x2, y2});
            }
        }
    }
    int l = -1, r = 1e9;
    while(r - l > 1){
        int m = (l + r) / 2;
        if(check(m)) l = m;
        else r = m;
    }
    cout << l;
}

int main(){
    ios_base::sync_with_stdio(false), cin.tie(nullptr);
    solve();
    return 0;
}

Compilation message

mecho.cpp: In function 'bool check(int)':
mecho.cpp:41:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   41 |         auto [x, y] = q.front();
      |              ^
mecho.cpp: In function 'void solve()':
mecho.cpp:78:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   78 |         auto [x, y] = q.front();
      |              ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 106 ms 8740 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 452 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 460 KB Output is correct
12 Correct 1 ms 824 KB Output is correct
13 Correct 1 ms 708 KB Output is correct
14 Correct 2 ms 844 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 1 ms 456 KB Output is correct
17 Correct 1 ms 460 KB Output is correct
18 Correct 1 ms 464 KB Output is correct
19 Correct 1 ms 588 KB Output is correct
20 Correct 1 ms 588 KB Output is correct
21 Correct 1 ms 588 KB Output is correct
22 Correct 1 ms 716 KB Output is correct
23 Correct 1 ms 716 KB Output is correct
24 Correct 1 ms 716 KB Output is correct
25 Correct 1 ms 844 KB Output is correct
26 Correct 1 ms 844 KB Output is correct
27 Correct 1 ms 972 KB Output is correct
28 Correct 1 ms 844 KB Output is correct
29 Correct 1 ms 972 KB Output is correct
30 Correct 1 ms 972 KB Output is correct
31 Correct 1 ms 972 KB Output is correct
32 Correct 1 ms 972 KB Output is correct
33 Correct 6 ms 3788 KB Output is correct
34 Correct 6 ms 3764 KB Output is correct
35 Correct 31 ms 3916 KB Output is correct
36 Correct 6 ms 4300 KB Output is correct
37 Correct 6 ms 4300 KB Output is correct
38 Correct 36 ms 4300 KB Output is correct
39 Correct 9 ms 4812 KB Output is correct
40 Correct 9 ms 4856 KB Output is correct
41 Correct 43 ms 4896 KB Output is correct
42 Correct 8 ms 5324 KB Output is correct
43 Correct 7 ms 5404 KB Output is correct
44 Correct 58 ms 5324 KB Output is correct
45 Correct 11 ms 5976 KB Output is correct
46 Correct 12 ms 5964 KB Output is correct
47 Correct 71 ms 5928 KB Output is correct
48 Correct 13 ms 6476 KB Output is correct
49 Correct 13 ms 6468 KB Output is correct
50 Correct 85 ms 6484 KB Output is correct
51 Correct 18 ms 6968 KB Output is correct
52 Correct 19 ms 7076 KB Output is correct
53 Correct 114 ms 7064 KB Output is correct
54 Correct 19 ms 7536 KB Output is correct
55 Correct 22 ms 7620 KB Output is correct
56 Correct 151 ms 7628 KB Output is correct
57 Correct 17 ms 8180 KB Output is correct
58 Correct 15 ms 8152 KB Output is correct
59 Correct 138 ms 8180 KB Output is correct
60 Correct 22 ms 8652 KB Output is correct
61 Correct 20 ms 8624 KB Output is correct
62 Correct 196 ms 8780 KB Output is correct
63 Correct 115 ms 8628 KB Output is correct
64 Correct 196 ms 8644 KB Output is correct
65 Correct 193 ms 8776 KB Output is correct
66 Correct 131 ms 8616 KB Output is correct
67 Correct 117 ms 8720 KB Output is correct
68 Correct 51 ms 8648 KB Output is correct
69 Correct 54 ms 8660 KB Output is correct
70 Correct 34 ms 8652 KB Output is correct
71 Correct 42 ms 8648 KB Output is correct
72 Correct 40 ms 8748 KB Output is correct
73 Correct 49 ms 8900 KB Output is correct
74 Correct 70 ms 9004 KB Output is correct
75 Correct 88 ms 8896 KB Output is correct
76 Correct 72 ms 8908 KB Output is correct
77 Correct 79 ms 8896 KB Output is correct
78 Correct 87 ms 8968 KB Output is correct
79 Correct 65 ms 8908 KB Output is correct
80 Correct 71 ms 8908 KB Output is correct
81 Correct 81 ms 8880 KB Output is correct
82 Correct 66 ms 8872 KB Output is correct
83 Correct 103 ms 8908 KB Output is correct
84 Correct 83 ms 8900 KB Output is correct
85 Correct 81 ms 8900 KB Output is correct
86 Correct 90 ms 8900 KB Output is correct
87 Correct 101 ms 8936 KB Output is correct
88 Correct 125 ms 8884 KB Output is correct
89 Correct 96 ms 8776 KB Output is correct
90 Correct 102 ms 8884 KB Output is correct
91 Correct 99 ms 8884 KB Output is correct
92 Correct 127 ms 8884 KB Output is correct