oj.uz

Submission #386177

# Submission time Handle Problem Language Result Execution time Memory
386177 2021-04-06T00:49:24 Z ignaciocanta Mecho (IOI09_mecho) C++14
72 / 100
 204 ms 7424 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' || a[xx][yy] == 'M')){
				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));
	if(dist[x][y]-m <= 0) return 0;
	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 < 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;
	if(!can(0)){
		cout << -1 << "\n";
		return 0;
	}
	while(high-low > 1){
		int mid = low+(high-low)/2;
		if(can(mid)) low = mid;
		else high = mid;
	}
	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
72.0 / 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 384 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 115 ms 6892 KB Output is correct
8 Correct 2 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 2 ms 492 KB Output is correct
12 Correct 1 ms 876 KB Output is correct
13 Correct 1 ms 620 KB Output is 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 492 KB Output is correct
18 Correct 1 ms 620 KB Output is correct
19 Correct 1 ms 620 KB Output is correct
20 Correct 1 ms 620 KB Output is correct
21 Correct 1 ms 620 KB Output is correct
22 Correct 1 ms 620 KB Output is correct
23 Correct 1 ms 620 KB Output is correct
24 Correct 1 ms 748 KB Output is correct
25 Incorrect 1 ms 748 KB Output isn't correct
26 Correct 1 ms 876 KB Output is correct
27 Incorrect 2 ms 748 KB Output isn't correct
28 Correct 2 ms 876 KB Output is correct
29 Incorrect 2 ms 748 KB Output isn't correct
30 Correct 2 ms 876 KB Output is correct
31 Incorrect 2 ms 876 KB Output isn't correct
32 Correct 3 ms 876 KB Output is correct
33 Incorrect 20 ms 2668 KB Output isn't correct
34 Incorrect 24 ms 3180 KB Output isn't correct
35 Correct 28 ms 3052 KB Output is correct
36 Incorrect 20 ms 2924 KB Output isn't correct
37 Incorrect 31 ms 3564 KB Output isn't correct
38 Correct 38 ms 3564 KB Output is correct
39 Incorrect 25 ms 3308 KB Output isn't correct
40 Incorrect 39 ms 3948 KB Output isn't correct
41 Correct 49 ms 3948 KB Output is correct
42 Incorrect 31 ms 3820 KB Output isn't correct
43 Incorrect 49 ms 4460 KB Output isn't correct
44 Correct 65 ms 4460 KB Output is correct
45 Incorrect 37 ms 3948 KB Output isn't correct
46 Incorrect 56 ms 4844 KB Output isn't correct
47 Correct 80 ms 4844 KB Output is correct
48 Incorrect 42 ms 4332 KB Output isn't correct
49 Incorrect 68 ms 5228 KB Output isn't correct
50 Correct 106 ms 5356 KB Output is correct
51 Incorrect 49 ms 4716 KB Output isn't correct
52 Incorrect 80 ms 5740 KB Output isn't correct
53 Correct 146 ms 5740 KB Output is correct
54 Incorrect 56 ms 4972 KB Output isn't correct
55 Incorrect 93 ms 6124 KB Output isn't correct
56 Correct 132 ms 6124 KB Output is correct
57 Incorrect 70 ms 5356 KB Output isn't correct
58 Incorrect 107 ms 6608 KB Output isn't correct
59 Correct 161 ms 6612 KB Output is correct
60 Incorrect 73 ms 5740 KB Output isn't correct
61 Incorrect 122 ms 7020 KB Output isn't correct
62 Correct 172 ms 7020 KB Output is correct
63 Correct 120 ms 7020 KB Output is correct
64 Correct 176 ms 7040 KB Output is correct
65 Correct 204 ms 7020 KB Output is correct
66 Correct 169 ms 7040 KB Output is correct
67 Correct 37 ms 7020 KB Output is correct
68 Correct 55 ms 7020 KB Output is correct
69 Correct 49 ms 7020 KB Output is correct
70 Correct 44 ms 7020 KB Output is correct
71 Correct 43 ms 7020 KB Output is correct
72 Correct 41 ms 7020 KB Output is correct
73 Correct 50 ms 7276 KB Output is correct
74 Correct 95 ms 7276 KB Output is correct
75 Correct 90 ms 7276 KB Output is correct
76 Correct 97 ms 7424 KB Output is correct
77 Correct 103 ms 7312 KB Output is correct
78 Correct 34 ms 5868 KB Output is correct
79 Correct 92 ms 7276 KB Output is correct
80 Correct 101 ms 5868 KB Output is correct
81 Correct 89 ms 5996 KB Output is correct
82 Correct 77 ms 5996 KB Output is correct
83 Correct 112 ms 5996 KB Output is correct
84 Correct 112 ms 7148 KB Output is correct
85 Correct 106 ms 6124 KB Output is correct
86 Correct 105 ms 6124 KB Output is correct
87 Correct 93 ms 6124 KB Output is correct
88 Correct 102 ms 6124 KB Output is correct
89 Correct 128 ms 7148 KB Output is correct
90 Correct 112 ms 6892 KB Output is correct
91 Correct 117 ms 7148 KB Output is correct
92 Correct 114 ms 6124 KB Output is correct