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Submission #468614

# Submission time Handle Problem Language Result Execution time Memory
468614 2021-08-29T03:22:47 Z Yuisuyuno Mecho (IOI09_mecho) C++14
84 / 100
 235 ms 11688 KB 
//Nguyen Huu Hoang Minh
#include <bits/stdc++.h>
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define reset(x) memset(x, 0,sizeof(x))
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define N 805
#define remain(x) if (x > MOD) x -= MOD
#define ii pair<int, int>
#define iiii pair< ii , ii >
#define viiii vector< iiii >
#define vi vector<int>
#define vii vector< ii >
#define bit(x, i) (((x) >> (i)) & 1)
#define Task "test"
#define int long long

using namespace std;

typedef long double ld;
const int inf = 1e10;
const int minf = -1e10;

int n, s;
char a[N][N];
ii M, D;
vector<ii> bee;

void readfile()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    if (fopen(Task".inp","r"))
    {
        freopen(Task".inp","r",stdin);
        //freopen(Task".out","w",stdout);
    }
    cin >> n >> s;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=n; j++){
            cin >> a[i][j];
            if (a[i][j]=='M') M = ii(i,j);
            if (a[i][j]=='D') D = ii(i,j);
            if (a[i][j]=='H') bee.pb(ii(i,j));
        }
    }
}

int d[N][N];
int dm[N][N];
int dx[4] = {1,-1,0,0};
int dy[4] = {0,0,1,-1};
bool ok(int x, int y){
    if (1 <= x && x <= n && 1 <= y && y <= n) return true;
    return false;
}

void build_bee(){
    queue<ii> q;
    memset(d, -1, sizeof d);
    for(ii x : bee){
        d[x.fi][x.se]=0;
        q.push(ii(x.fi,x.se));
    }
    while (q.size()){
        int u = q.front().fi;
        int v = q.front().se;
        //cout << u << ' ' << v << ' ' << d[u][v] << endl;
        q.pop();
        for(int i=0; i<4; i++){
            int x = u + dx[i];
            int y = v + dy[i];
            if (d[x][y]==-1 && ok(x,y) && a[x][y]=='G'){
                d[x][y] = d[u][v] +1;
                q.push(ii(x,y));
            }
        }
    }
}

bool can_eat(int ti){
    queue<ii> q;
    memset(dm, -1, sizeof dm);
    dm[M.fi][M.se] = 0;
    q.push(ii(M.fi,M.se));
    while (q.size()){
        int u = q.front().fi;
        int v = q.front().se;
        q.pop();
        for(int i=0; i<4; i++){
            int x = u + dx[i];
            int y = v + dy[i];
            if (!ok(x,y) || a[x][y]=='T') continue;
            if (x==D.fi && y==D.se) return true;
            if (dm[x][y]==-1){
                dm[x][y] = dm[u][v] + 1;
                if (dm[x][y]/s + ti < d[x][y]){
                    q.push(ii(x,y));
                }
            }
        }
    }
    return false;
}

void proc()
{
    build_bee();
    int l = 0, r = 1e9, ans=-1;
    while (r-l > 0){
        int mid = (l+r)/2;
        if (can_eat(mid)){
            l = mid+1;
            ans = mid;
        }
        else r = mid;
    }
    cout << ans;
}

signed main()
{
    readfile();
    proc();
    return 0;
}

Compilation message

mecho.cpp: In function 'void readfile()':
mecho.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen(Task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 10444 KB Output is correct
2 Correct 15 ms 10464 KB Output is correct
3 Correct 12 ms 10464 KB Output is correct
4 Correct 12 ms 10468 KB Output is correct
5 Correct 13 ms 10472 KB Output is correct
6 Correct 12 ms 10444 KB Output is correct
7 Correct 132 ms 11204 KB Output is correct
8 Correct 13 ms 10444 KB Output is correct
9 Correct 13 ms 10440 KB Output is correct
10 Correct 13 ms 10484 KB Output is correct
11 Correct 13 ms 10476 KB Output is correct
12 Incorrect 14 ms 10444 KB Output isn't correct
13 Incorrect 16 ms 10572 KB Output isn't correct
14 Correct 16 ms 10528 KB Output is correct
15 Correct 13 ms 10480 KB Output is correct
16 Correct 12 ms 10416 KB Output is correct
17 Correct 17 ms 10372 KB Output is correct
18 Correct 12 ms 10488 KB Output is correct
19 Correct 13 ms 10484 KB Output is correct
20 Correct 14 ms 10388 KB Output is correct
21 Correct 16 ms 10496 KB Output is correct
22 Correct 16 ms 10496 KB Output is correct
23 Correct 13 ms 10444 KB Output is correct
24 Correct 13 ms 10444 KB Output is correct
25 Correct 13 ms 10444 KB Output is correct
26 Correct 12 ms 10512 KB Output is correct
27 Correct 12 ms 10444 KB Output is correct
28 Correct 14 ms 10444 KB Output is correct
29 Correct 12 ms 10520 KB Output is correct
30 Correct 16 ms 10524 KB Output is correct
31 Correct 13 ms 10444 KB Output is correct
32 Correct 13 ms 10444 KB Output is correct
33 Correct 17 ms 10752 KB Output is correct
34 Correct 18 ms 10664 KB Output is correct
35 Correct 48 ms 10732 KB Output is correct
36 Correct 18 ms 10788 KB Output is correct
37 Correct 17 ms 10704 KB Output is correct
38 Correct 55 ms 10700 KB Output is correct
39 Correct 17 ms 10744 KB Output is correct
40 Correct 21 ms 10736 KB Output is correct
41 Correct 64 ms 10828 KB Output is correct
42 Correct 20 ms 10828 KB Output is correct
43 Correct 19 ms 10868 KB Output is correct
44 Correct 76 ms 10856 KB Output is correct
45 Correct 20 ms 10792 KB Output is correct
46 Correct 21 ms 10828 KB Output is correct
47 Correct 94 ms 10900 KB Output is correct
48 Correct 23 ms 10812 KB Output is correct
49 Correct 23 ms 10860 KB Output is correct
50 Correct 117 ms 10864 KB Output is correct
51 Correct 24 ms 10948 KB Output is correct
52 Correct 24 ms 10872 KB Output is correct
53 Correct 139 ms 10956 KB Output is correct
54 Correct 26 ms 10944 KB Output is correct
55 Correct 26 ms 11016 KB Output is correct
56 Correct 184 ms 10960 KB Output is correct
57 Correct 27 ms 10956 KB Output is correct
58 Correct 28 ms 11056 KB Output is correct
59 Correct 174 ms 10984 KB Output is correct
60 Correct 31 ms 11036 KB Output is correct
61 Correct 39 ms 11084 KB Output is correct
62 Correct 235 ms 11016 KB Output is correct
63 Correct 163 ms 11012 KB Output is correct
64 Correct 228 ms 11076 KB Output is correct
65 Correct 215 ms 11092 KB Output is correct
66 Correct 199 ms 11076 KB Output is correct
67 Correct 163 ms 11096 KB Output is correct
68 Correct 72 ms 11076 KB Output is correct
69 Correct 62 ms 11152 KB Output is correct
70 Correct 63 ms 11068 KB Output is correct
71 Correct 50 ms 11032 KB Output is correct
72 Incorrect 91 ms 11084 KB Output isn't correct
73 Incorrect 106 ms 11688 KB Output isn't correct
74 Correct 97 ms 11556 KB Output is correct
75 Correct 113 ms 11588 KB Output is correct
76 Correct 103 ms 11680 KB Output is correct
77 Correct 94 ms 11588 KB Output is correct
78 Correct 124 ms 11544 KB Output is correct
79 Correct 81 ms 11572 KB Output is correct
80 Correct 94 ms 11592 KB Output is correct
81 Correct 104 ms 11580 KB Output is correct
82 Correct 82 ms 11540 KB Output is correct
83 Correct 145 ms 11540 KB Output is correct
84 Correct 115 ms 11424 KB Output is correct
85 Correct 111 ms 11544 KB Output is correct
86 Correct 116 ms 11540 KB Output is correct
87 Correct 124 ms 11512 KB Output is correct
88 Correct 125 ms 11420 KB Output is correct
89 Correct 125 ms 11360 KB Output is correct
90 Correct 140 ms 11332 KB Output is correct
91 Correct 130 ms 11420 KB Output is correct
92 Correct 135 ms 11460 KB Output is correct