oj.uz

Submission #395117

# Submission time Handle Problem Language Result Execution time Memory
395117 2021-04-27T20:21:49 Z MarcoMeijer Mecho (IOI09_mecho) C++14
100 / 100
 624 ms 3000 KB 
#include <bits/stdc++.h>
using namespace std;
 
// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e18
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
 
// input
template<class T> void IN(T& x) {cin >> x;}
template<class H, class... T> void IN(H& h, T&... t) {IN(h); IN(t...); }
 
// output
template<class T1, class T2> void OUT(const pair<T1,T2>& x);
template<class T> void OUT(const vector<T>& x);
template<class T> void OUT(const T& x) {cout << x;}
template<class H, class... T> void OUT(const H& h, const T&... t) {OUT(h); OUT(t...); }
template<class T1, class T2> void OUT(const pair<T1,T2>& x) {OUT(x.fi,' ',x.se);}
template<class T> void OUT(const vector<T>& x) {RE(i,x.size()) OUT(i==0?"":" ",x[i]);}
template<class... T> void OUTL(const T&... t) {OUT(t..., "\n"); }
template<class H> void OUTLS(const H& h) {OUTL(h); }
template<class H, class... T> void OUTLS(const H& h, const T&... t) {OUT(h,' '); OUTLS(t...); }
 
// dp
template<class T> bool ckmin(T&a, T&b) { bool bl = a > b; a = min(a,b); return bl;}
template<class T> bool ckmax(T&a, T&b) { bool bl = a < b; a = max(a,b); return bl;}
 
void program();
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    program();
}
 
 
//===================//
//   begin program   //
//===================//
 
const int MX = 850;
const int N = (1<<20);

int n,s;
char ogr[MX][MX];
char gr[MX][MX];
int dx[]={-1,0,1,0};
int dy[]={0,1,0,-1};

queue<ii> bq, hq;

bool inside(int x, int y) {return x>=0 && x<n && y>=0 && y<n;}

bool moveHoney() {
    queue<ii> nq;
    while(!hq.empty()) {
        int x = hq.front().fi;
        int y = hq.front().se; hq.pop();
        if(gr[x][y] != 'M') continue;
        RE(d,4) {
            int nx = x+dx[d];
            int ny = y+dy[d];
            if(!inside(nx,ny)) continue;
            if(gr[nx][ny] == 'D') return true;
            if(gr[nx][ny] != 'G') continue;
            gr[nx][ny] = 'M';
            nq.push({nx,ny});
        }
    }
    hq = nq;
    return false;
}
void moveBees() {
    queue<ii> nq;
    while(!bq.empty()) {
        int x = bq.front().fi;
        int y = bq.front().se; bq.pop();
        RE(d,4) {
            int nx = x+dx[d];
            int ny = y+dy[d];
            if(!inside(nx,ny)) continue;
            if(gr[nx][ny] != 'G' && gr[nx][ny] != 'M') continue;
            gr[nx][ny] = 'H';
            nq.push({nx,ny});
        }
    }
    bq = nq;
}

bool possible(int x) {
    RE(i,n) RE(j,n) gr[i][j] = ogr[i][j];

    while(!bq.empty()) bq.pop();
    while(!hq.empty()) hq.pop();

    RE(i,n) RE(j,n) if(gr[i][j]=='H') bq.push({i,j});
    RE(i,n) RE(j,n) if(gr[i][j]=='M') hq.push({i,j});
    RE(_,x) moveBees();

    while(!hq.empty()) {
        RE(_,s) if(moveHoney()) return true;
        moveBees();
    }

    return false;
}

void program() {
    IN(n,s);
    RE(i,n) RE(j,n) IN(ogr[i][j]);

    if(!possible(0)) {
        OUTL(-1);
        return;
    }

    int lb=0, ub=n*n;
    while(lb != ub) {
        int mid=(lb+ub+1)/2;
        if(possible(mid)) lb=mid;
        else ub=mid-1;
    }
    OUTL(lb);
}

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 336 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 420 ms 2664 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 2 ms 336 KB Output is correct
13 Correct 2 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 2 ms 332 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 2 ms 332 KB Output is correct
24 Correct 2 ms 332 KB Output is correct
25 Correct 3 ms 332 KB Output is correct
26 Correct 2 ms 328 KB Output is correct
27 Correct 3 ms 332 KB Output is correct
28 Correct 3 ms 332 KB Output is correct
29 Correct 4 ms 460 KB Output is correct
30 Correct 3 ms 460 KB Output is correct
31 Correct 4 ms 460 KB Output is correct
32 Correct 3 ms 464 KB Output is correct
33 Correct 110 ms 1012 KB Output is correct
34 Correct 70 ms 1000 KB Output is correct
35 Correct 55 ms 972 KB Output is correct
36 Correct 140 ms 1140 KB Output is correct
37 Correct 100 ms 1108 KB Output is correct
38 Correct 74 ms 1100 KB Output is correct
39 Correct 186 ms 1268 KB Output is correct
40 Correct 129 ms 1228 KB Output is correct
41 Correct 94 ms 1220 KB Output is correct
42 Correct 233 ms 1404 KB Output is correct
43 Correct 154 ms 1400 KB Output is correct
44 Correct 116 ms 1420 KB Output is correct
45 Correct 300 ms 1484 KB Output is correct
46 Correct 200 ms 1484 KB Output is correct
47 Correct 142 ms 1496 KB Output is correct
48 Correct 333 ms 1668 KB Output is correct
49 Correct 226 ms 1696 KB Output is correct
50 Correct 168 ms 1612 KB Output is correct
51 Correct 414 ms 1860 KB Output is correct
52 Correct 272 ms 1740 KB Output is correct
53 Correct 201 ms 1740 KB Output is correct
54 Correct 482 ms 1988 KB Output is correct
55 Correct 322 ms 1988 KB Output is correct
56 Correct 234 ms 1984 KB Output is correct
57 Correct 559 ms 2240 KB Output is correct
58 Correct 371 ms 2244 KB Output is correct
59 Correct 278 ms 2124 KB Output is correct
60 Correct 624 ms 2272 KB Output is correct
61 Correct 436 ms 2272 KB Output is correct
62 Correct 324 ms 2252 KB Output is correct
63 Correct 340 ms 2276 KB Output is correct
64 Correct 369 ms 2376 KB Output is correct
65 Correct 339 ms 2272 KB Output is correct
66 Correct 364 ms 2284 KB Output is correct
67 Correct 24 ms 2252 KB Output is correct
68 Correct 356 ms 2252 KB Output is correct
69 Correct 314 ms 2372 KB Output is correct
70 Correct 369 ms 2252 KB Output is correct
71 Correct 363 ms 2372 KB Output is correct
72 Correct 371 ms 2252 KB Output is correct
73 Correct 365 ms 2940 KB Output is correct
74 Correct 425 ms 2836 KB Output is correct
75 Correct 456 ms 2940 KB Output is correct
76 Correct 456 ms 2828 KB Output is correct
77 Correct 457 ms 3000 KB Output is correct
78 Correct 30 ms 2768 KB Output is correct
79 Correct 427 ms 2964 KB Output is correct
80 Correct 441 ms 2764 KB Output is correct
81 Correct 432 ms 2928 KB Output is correct
82 Correct 427 ms 2716 KB Output is correct
83 Correct 446 ms 2836 KB Output is correct
84 Correct 450 ms 2732 KB Output is correct
85 Correct 453 ms 2848 KB Output is correct
86 Correct 458 ms 2816 KB Output is correct
87 Correct 430 ms 2688 KB Output is correct
88 Correct 431 ms 2716 KB Output is correct
89 Correct 434 ms 2500 KB Output is correct
90 Correct 442 ms 2584 KB Output is correct
91 Correct 427 ms 2596 KB Output is correct
92 Correct 428 ms 2632 KB Output is correct