oj.uz

Submission #386174

# Submission time Handle Problem Language Result Execution time Memory
386174 2021-04-06T00:26:51 Z ignaciocanta Mecho (IOI09_mecho) C++14
56 / 100
 182 ms 7148 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
using tint = long long;
using ld = long double;
 
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
 
using pi = pair<int,int>;
using pl = pair<tint,tint>;
using vi = vector<int>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vvi = vector<vi>;
using vl = vector<tint>;
using vb = vector<bool>;
 
#define pb push_back
#define pf push_front
#define rsz resize
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sz(x) (int)(x).size()
#define ins insert
 
#define f first
#define s second
#define mp make_pair
 
#define DBG(x) cerr << #x << " = " << x << endl;
 
const int MOD = 1e9+9; //change this
const tint mod = 998244353;
const int MX = 805;
const tint INF = 1e18; 
const int inf = 2e9;
const ld PI = acos(ld(-1)); 
const ld eps = 1e-5;
 
const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};
 
template<class T> void remDup(vector<T> &v){ 
    sort(all(v)); v.erase(unique(all(v)),end(v));
}
 
template<class T> bool ckmin(T& a, const T& b) {
    return b < a ? a = b, 1 : 0; 
} 
template<class T> bool ckmax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0; 
}
 
bool valid(int x, int y, int n, int m){
    return (0<=x && x<n && 0<=y && y<m);
}
 
int cdiv(int a, int b) { return a/b+((a^b)>0&&a%b); } //redondea p arriba
int fdiv(int a, int b) { return a/b-((a^b)<0&&a%b); } //redondea p abajo
 
void NACHO(string name = ""){
    ios_base::sync_with_stdio(0); cin.tie(0);
    if(sz(name)){
        freopen((name+".in").c_str(), "r", stdin);
        freopen((name+".out").c_str(), "w", stdout);
    }
}

string a[MX];
int x, y, sx, sy;
int dist[MX][MX];
int distM[MX][MX];
bool vis[MX][MX];
int n, s;

void bfs(){
	queue<pi> q;
	F0R(i, n){
		F0R(j, n){
			dist[i][j] = inf;
			if(a[i][j] == 'H'){
				dist[i][j] = 0;
				vis[i][j] = 1;
				q.push(mp(i, j));
			}
		}
	}
	while(sz(q)){
		auto u = q.front(); q.pop();
		F0R(k, 4){
			int xx = u.f+dx[k], yy = u.s+dy[k];
			if(valid(xx, yy, n, n) && !vis[xx][yy] && a[xx][yy] == 'G'){
				dist[xx][yy] = dist[u.f][u.s]+1;
				vis[xx][yy] = 1;
				q.push(mp(xx, yy));
			}
		}
	}
}

bool bee[MX][MX];

bool can(int m){
	F0R(i, n) F0R(j, n) vis[i][j] = 0;
	vis[x][y] = 1;
	queue<pi> q;
	q.push(mp(x, y));
	while(sz(q)){
		auto u = q.front(); q.pop();
		F0R(k, 4){
			int xx = u.f+dx[k], yy = u.s+dy[k];
			if(valid(xx, yy, n, n) && !vis[xx][yy] && (a[xx][yy] == 'G' || a[xx][yy] == 'D') && (distM[u.f][u.s]+1)/s < max(0, dist[xx][yy]-m)){
				distM[xx][yy] = distM[u.f][u.s]+1;
				vis[xx][yy] = 1;
				q.push(mp(xx, yy));
			}
		}
	}
	return vis[sx][sy];
}

int main(){
	NACHO();
	cin >> n >> s;
	F0R(i, n){
		cin >> a[i];
		F0R(j, n){
			if(a[i][j] == 'M') x = i, y = j;
			if(a[i][j] == 'D') sx = i, sy = j;
		}
	}
	bfs();
	int low = 0, high = 2*MX+5;
	while(high-low > 1){
		int mid = low+(high-low)/2;
		if(can(mid)) low = mid;
		else high = mid;
	}
	if(!can(low)) low = -1;
	cout << low << "\n";
}
/*
3 1
MGD
GGG
HGG
*/
/*
7 3
TTTTTTT 
TGGGGGT 
TGGGGGT 
MGGGGGD 
TGGGGGT 
TGGGGGT 
TGHHGGT
*/
/*
7 3
TTTTTTT 
TGGGGGT 
TGGGGGT 
MGGGGGD 
TGGGGGT 
TGGGGGT 
THHHHHT
*/

Compilation message

mecho.cpp: In function 'void NACHO(std::string)':
mecho.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   69 |         freopen((name+".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   70 |         freopen((name+".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
56.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 2 ms 364 KB Output is correct
5 Correct 1 ms 508 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 103 ms 5740 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Incorrect 1 ms 620 KB Output isn't correct
13 Incorrect 1 ms 620 KB Output isn't correct
14 Correct 1 ms 748 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 1 ms 492 KB Output is correct
17 Correct 1 ms 512 KB Output is correct
18 Correct 1 ms 492 KB Output is correct
19 Correct 1 ms 492 KB Output is correct
20 Correct 1 ms 492 KB Output is correct
21 Correct 1 ms 620 KB Output is correct
22 Correct 1 ms 640 KB Output is correct
23 Correct 1 ms 620 KB Output is correct
24 Correct 1 ms 620 KB Output is correct
25 Incorrect 1 ms 748 KB Output isn't correct
26 Correct 1 ms 620 KB Output is correct
27 Incorrect 1 ms 748 KB Output isn't correct
28 Correct 1 ms 748 KB Output is correct
29 Incorrect 2 ms 748 KB Output isn't correct
30 Correct 1 ms 748 KB Output is correct
31 Incorrect 2 ms 748 KB Output isn't correct
32 Correct 2 ms 748 KB Output is correct
33 Incorrect 15 ms 2412 KB Output isn't correct
34 Incorrect 23 ms 2924 KB Output isn't correct
35 Correct 31 ms 3052 KB Output is correct
36 Incorrect 19 ms 2796 KB Output isn't correct
37 Incorrect 30 ms 3308 KB Output isn't correct
38 Correct 37 ms 3456 KB Output is correct
39 Incorrect 24 ms 3052 KB Output isn't correct
40 Incorrect 37 ms 3820 KB Output isn't correct
41 Correct 50 ms 3820 KB Output is correct
42 Incorrect 30 ms 3436 KB Output isn't correct
43 Incorrect 46 ms 4204 KB Output isn't correct
44 Correct 61 ms 4204 KB Output is correct
45 Incorrect 36 ms 3788 KB Output isn't correct
46 Incorrect 56 ms 4588 KB Output isn't correct
47 Correct 79 ms 4716 KB Output is correct
48 Incorrect 43 ms 4076 KB Output isn't correct
49 Incorrect 66 ms 4972 KB Output isn't correct
50 Correct 98 ms 4972 KB Output is correct
51 Incorrect 49 ms 4480 KB Output isn't correct
52 Incorrect 79 ms 5356 KB Output isn't correct
53 Correct 113 ms 5484 KB Output is correct
54 Incorrect 58 ms 4716 KB Output isn't correct
55 Incorrect 93 ms 5868 KB Output isn't correct
56 Correct 136 ms 5996 KB Output is correct
57 Incorrect 67 ms 5100 KB Output isn't correct
58 Incorrect 105 ms 6252 KB Output isn't correct
59 Correct 157 ms 6252 KB Output is correct
60 Incorrect 73 ms 5484 KB Output isn't correct
61 Incorrect 123 ms 6636 KB Output isn't correct
62 Correct 180 ms 6764 KB Output is correct
63 Correct 118 ms 6764 KB Output is correct
64 Correct 160 ms 6764 KB Output is correct
65 Correct 182 ms 6764 KB Output is correct
66 Correct 157 ms 6892 KB Output is correct
67 Correct 138 ms 6764 KB Output is correct
68 Correct 53 ms 6764 KB Output is correct
69 Correct 47 ms 6764 KB Output is correct
70 Correct 43 ms 6764 KB Output is correct
71 Correct 42 ms 6764 KB Output is correct
72 Incorrect 34 ms 4716 KB Output isn't correct
73 Incorrect 86 ms 7020 KB Output isn't correct
74 Correct 63 ms 7020 KB Output is correct
75 Correct 82 ms 7020 KB Output is correct
76 Correct 73 ms 7020 KB Output is correct
77 Correct 82 ms 7148 KB Output is correct
78 Correct 91 ms 5612 KB Output is correct
79 Correct 70 ms 5612 KB Output is correct
80 Correct 76 ms 5484 KB Output is correct
81 Correct 86 ms 5612 KB Output is correct
82 Correct 74 ms 5484 KB Output is correct
83 Correct 96 ms 5612 KB Output is correct
84 Correct 93 ms 5612 KB Output is correct
85 Correct 99 ms 5740 KB Output is correct
86 Correct 103 ms 5612 KB Output is correct
87 Correct 101 ms 5612 KB Output is correct
88 Correct 100 ms 5868 KB Output is correct
89 Correct 112 ms 5868 KB Output is correct
90 Correct 114 ms 5868 KB Output is correct
91 Correct 107 ms 5612 KB Output is correct
92 Correct 112 ms 5740 KB Output is correct