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Submission #583556

# Submission time Handle Problem Language Result Execution time Memory
583556 2022-06-25T14:43:43 Z Trent Mecho (IOI09_mecho) C++17
100 / 100
 220 ms 6972 KB 
#include "bits/stdc++.h"
#include "ext/pb_ds/assoc_container.hpp"

using namespace std;
using namespace __gnu_pbds;
#define ll long long
#define open(g) string _name_ = g; freopen((_name_ + ".in").c_str(), "r", stdin); freopen((_name_ + ".out").c_str(), "w", stdout)
#define printArr(a, len) for(int asdf = 0; asdf < (len); ++asdf) cout << (a)[asdf] << ' '; cout << '\n';
#define boost() cin.sync_with_stdio(0); cin.tie(0)
#define forR(i, x) for(int i = 0; i < x; ++i)
#define REP(i, a, b) for(int i = (a); i < (b); ++i)
#define all(i) i.begin(), i.end()
#define pii pair<int, int>
#define vi vector<int>
#define si set<int>
#define usi unordered_set<int>
#define mii map<int, int>
#define umii unordered_map<int, int>
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")

const int MN = 810, INF = 1e9 + 10;
struct coord{int r, c;};
struct bear{int r, c, sl;};
bool vis[MN][MN];
int bee[MN][MN], ber[MN][MN]; // minimum # of minutes needed to end here
char grid[MN][MN];
int dir[4][2] = {{1, 0}, {0, 1}, {0, -1}, {-1, 0}};
int n, s;
int mr, mc;

bool ib(int r, int c){return 0 <= r && r < n && 0 <= c && c < n;}
bool iv(int r, int c){return ib(r, c) && grid[r][c] != 'T';}

// t = number of minutes bear eats
bool pos(int t){
    if(bee[mr][mc] <= t) return false;
    deque<bear> bfs = {{mr, mc, 0}};
    forR(a, MN) forR(b, MN) vis[a][b] = false;
    forR(a, MN) forR(b, MN) ber[a][b] = 0;
    ber[mr][mc] = t;
    vis[mr][mc] = true;
    while(!bfs.empty()){
        auto [r, c, sl] = bfs.front();
        bfs.pop_front();
        if(!(sl > 0 || ber[r][c] < bee[r][c])){
            cout << r << ' ' << c << ' ' << sl << '\n';
            cout << "bad";
        }
        if(grid[r][c] == 'D') {
            return true;
        }
        for(auto [rc, cc] : dir){
            auto [nr, nc] = pii{r+rc, c+cc};
            int dis = ber[r][c] + (sl == 0);
            int nsl = sl == 0 ? s - 1 : sl - 1;
            // cout << r << ' ' << c << ' ' << sl << ' ' << nr << ' ' << nc << ' ' << dis << ' ' << bee[nr][nc] << '\n';
            if(iv(nr, nc) && grid[nr][nc] != 'H' && !vis[nr][nc] && (nsl != 0 && bee[nr][nc] == dis || dis < bee[nr][nc])){
                ber[nr][nc] = dis;
                vis[nr][nc] = true;
                bfs.push_back({nr, nc, nsl});
            }
        }
    }
    return false;
}

signed main() {
    cin >> n >> s;
    deque<coord> bfs;
    forR(r, n) forR(c, n){
        cin >> grid[r][c];
        if(grid[r][c] == 'H') {
            bfs.push_back({r, c});
            vis[r][c] = true;
        } else if(grid[r][c] == 'M'){
            mr=r, mc=c;
        }
    }
    while(!bfs.empty()){
        auto [r, c] = bfs.front();
        bfs.pop_front();
        for(auto [cr, cc] : dir){
            auto [nr, nc] = pii {r + cr, c + cc};
            if(iv(nr, nc) && grid[nr][nc] != 'D' && !vis[nr][nc]){
                vis[nr][nc] = true;
                bee[nr][nc] = bee[r][c] + 1;
                bfs.push_back({nr, nc});
            }
        }
    }
    forR(r, MN) forR(c, MN) if(!vis[r][c]) bee[r][c] = INF;
    if(!pos(0)) cout << "-1\n";
    else {
        // TODO fix hi
        int lo=0, hi=MN * MN;
        while(hi - lo > 1){
            int mid = (lo + hi) / 2;
            if(pos(mid)) lo = mid;
            else hi = mid;
        }
        cout << lo << '\n';
    }
}

Compilation message

mecho.cpp: In function 'bool pos(int)':
mecho.cpp:58:79: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   58 |             if(iv(nr, nc) && grid[nr][nc] != 'H' && !vis[nr][nc] && (nsl != 0 && bee[nr][nc] == dis || dis < bee[nr][nc])){
      |                                                                      ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5972 KB Output is correct
2 Correct 4 ms 5972 KB Output is correct
3 Correct 5 ms 6088 KB Output is correct
4 Correct 3 ms 5972 KB Output is correct
5 Correct 3 ms 5972 KB Output is correct
6 Correct 3 ms 6100 KB Output is correct
7 Correct 131 ms 6812 KB Output is correct
8 Correct 3 ms 6100 KB Output is correct
9 Correct 3 ms 6100 KB Output is correct
10 Correct 4 ms 6100 KB Output is correct
11 Correct 3 ms 6100 KB Output is correct
12 Correct 4 ms 6100 KB Output is correct
13 Correct 4 ms 6100 KB Output is correct
14 Correct 4 ms 6100 KB Output is correct
15 Correct 4 ms 6100 KB Output is correct
16 Correct 4 ms 6100 KB Output is correct
17 Correct 4 ms 6100 KB Output is correct
18 Correct 4 ms 6100 KB Output is correct
19 Correct 4 ms 6100 KB Output is correct
20 Correct 4 ms 6004 KB Output is correct
21 Correct 4 ms 6100 KB Output is correct
22 Correct 5 ms 6100 KB Output is correct
23 Correct 4 ms 6100 KB Output is correct
24 Correct 5 ms 6100 KB Output is correct
25 Correct 5 ms 6100 KB Output is correct
26 Correct 4 ms 6100 KB Output is correct
27 Correct 5 ms 6072 KB Output is correct
28 Correct 6 ms 6100 KB Output is correct
29 Correct 4 ms 6100 KB Output is correct
30 Correct 4 ms 6100 KB Output is correct
31 Correct 6 ms 6100 KB Output is correct
32 Correct 5 ms 6100 KB Output is correct
33 Correct 13 ms 6284 KB Output is correct
34 Correct 15 ms 6356 KB Output is correct
35 Correct 32 ms 6356 KB Output is correct
36 Correct 14 ms 6308 KB Output is correct
37 Correct 15 ms 6412 KB Output is correct
38 Correct 38 ms 6332 KB Output is correct
39 Correct 17 ms 6356 KB Output is correct
40 Correct 17 ms 6412 KB Output is correct
41 Correct 48 ms 6356 KB Output is correct
42 Correct 21 ms 6492 KB Output is correct
43 Correct 22 ms 6476 KB Output is correct
44 Correct 61 ms 6468 KB Output is correct
45 Correct 25 ms 6528 KB Output is correct
46 Correct 25 ms 6396 KB Output is correct
47 Correct 73 ms 6476 KB Output is correct
48 Correct 27 ms 6540 KB Output is correct
49 Correct 29 ms 6524 KB Output is correct
50 Correct 92 ms 6548 KB Output is correct
51 Correct 33 ms 6476 KB Output is correct
52 Correct 31 ms 6548 KB Output is correct
53 Correct 98 ms 6508 KB Output is correct
54 Correct 35 ms 6520 KB Output is correct
55 Correct 37 ms 6612 KB Output is correct
56 Correct 130 ms 6632 KB Output is correct
57 Correct 46 ms 6652 KB Output is correct
58 Correct 41 ms 6580 KB Output is correct
59 Correct 141 ms 6668 KB Output is correct
60 Correct 43 ms 6640 KB Output is correct
61 Correct 44 ms 6648 KB Output is correct
62 Correct 155 ms 6664 KB Output is correct
63 Correct 151 ms 6708 KB Output is correct
64 Correct 213 ms 6672 KB Output is correct
65 Correct 220 ms 6704 KB Output is correct
66 Correct 205 ms 6656 KB Output is correct
67 Correct 65 ms 6620 KB Output is correct
68 Correct 82 ms 6732 KB Output is correct
69 Correct 77 ms 6620 KB Output is correct
70 Correct 79 ms 6728 KB Output is correct
71 Correct 73 ms 6708 KB Output is correct
72 Correct 57 ms 6640 KB Output is correct
73 Correct 70 ms 6936 KB Output is correct
74 Correct 106 ms 6860 KB Output is correct
75 Correct 126 ms 6932 KB Output is correct
76 Correct 95 ms 6944 KB Output is correct
77 Correct 99 ms 6972 KB Output is correct
78 Correct 60 ms 6948 KB Output is correct
79 Correct 83 ms 6860 KB Output is correct
80 Correct 95 ms 6860 KB Output is correct
81 Correct 99 ms 6944 KB Output is correct
82 Correct 90 ms 6944 KB Output is correct
83 Correct 106 ms 6860 KB Output is correct
84 Correct 111 ms 6840 KB Output is correct
85 Correct 103 ms 6908 KB Output is correct
86 Correct 106 ms 6860 KB Output is correct
87 Correct 112 ms 6808 KB Output is correct
88 Correct 136 ms 6824 KB Output is correct
89 Correct 129 ms 6860 KB Output is correct
90 Correct 122 ms 6856 KB Output is correct
91 Correct 109 ms 6812 KB Output is correct
92 Correct 119 ms 6848 KB Output is correct