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Submission #233151

# Submission time Handle Problem Language Result Execution time Memory
233151 2020-05-19T14:54:44 Z anubhavdhar Mecho (IOI09_mecho) C++14
60 / 100
 223 ms 7808 KB 
#include<bits/stdc++.h>

#define ll long long int
#define pb push_back
#define mp make_pair
#define FOR(i,n) for(i=0;i<(n);++i)
#define FORe(i,n) for(i=1;i<=(n);++i)
#define FORr(i,a,b) for(i=(a);i<(b);++i)
#define FORrev(i,n) for(i=(n);i>=0;--i)
#define F0R(i,n) for(int i=0;i<(n);++i)
#define F0Re(i,n) for(int i=1;i<=(n);++i)
#define F0Rr(i,a,b) for(ll i=(a);i<(b);++i)
#define F0Rrev(i,n) for(int i=(n);i>=0;--i)
#define ii pair<ll,ll>
#define vi vector<ll>
#define vii vector<ii>
#define ff first 
#define ss second
#define cd complex<double>
#define vcd vector<cd>
#define ldd long double
#define dbgLine cout<<"Line : "<<__LINE__<<'\n'
#define all(x) (x).begin(),(x).end()

using namespace std;

const short int __PRECISION = 10;

const ll MOD = 1e9+7;
const ll INF = 1e17 + 1101;
const ll LOGN = 17;
const ll MAXN = 2e5+5;
const ll ROOTN = 320;

const int inf = 1e9+2;

const ldd PI = acos(-1);
const ldd EPS = 1e-7;

int N, S, disB[900][900], disM[900][900], X, Y, H, K;
char grid[900][900];
bool vis[900][900];

inline bool inside(int i, int j)
{
	return ((i < N) && (i >= 0) && (j < N) && (j >= 0));
}

int main()
{
	
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	

	cin>>N>>S;
	queue<pair<int, int>> Q;

	F0R(i, N)
		F0R(j ,N)
		{
			cin>>grid[i][j];
			vis[i][j] = false;
			disB[i][j] = inf;
			if(grid[i][j] == 'H')
				Q.push(mp(i, j)), disB[i][j] = 0, vis[i][j] = true;
			else if(grid[i][j] == 'M')
				X = i, Y = j;
			else if(grid[i][j] == 'D')
				H = i, K = j;
		}

	while(!Q.empty())
	{
		int x = Q.front().ff, y = Q.front().ss;
		Q.pop();
		for(pair<int, int> p : {mp(0, -1), mp(0, 1), mp(1, 0), mp(-1, 0)})
			if(inside(x+p.ff, y+p.ss) && (!vis[x+p.ff][y+p.ss]) && (grid[x+p.ff][y+p.ss] == 'G'))
			{
				disB[x+p.ff][y+p.ss] = disB[x][y] + 1;
				vis[x+p.ff][y+p.ss] = true;
				Q.push(mp(x+p.ff, y+p.ss));
			}
	}

	int lo = 0, hi = 4000, mid;

	// F0R(i, N)
	// {
	// 	F0R(j, N)
	// 		if(disB[i][j] == inf) cout<<'-';
	// 		else	cout<<disB[i][j];
	// 	cout<<'\n';
	// }


	while(lo < hi - 1)
	{
		mid = (lo + hi)/2;
		// cout<<"mid = "<<mid<<'\n';
		F0R(i, N)
			F0R(j, N)
				vis[i][j] = false, disM[i][j] = inf;
		vis[X][Y] = true;
		disM[X][Y] = 0;
		Q.push(mp(X, Y));
		while(!Q.empty())
		{
			int x = Q.front().ff, y = Q.front().ss;
			Q.pop();
			// cout<<"disM["<<x<<"]["<<y<<"] = "<<disM[x][y]<<'\n';
			if (disB[x][y] <= mid + (disM[x][y])/S)
			{
				disM[x][y] = inf;
				// cout<<x<<','<<y<<" is unreachable\n";
				continue;
			}
			for(pair<int, int> p : {mp(0, -1), mp(0, 1), mp(1, 0), mp(-1, 0)})
				if(inside(x+p.ff, y+p.ss)&&(!vis[x+p.ff][y+p.ss])&&(grid[x+p.ff][y+p.ss] == 'G'))
				{
					disM[x+p.ff][y+p.ss] = disM[x][y] + 1;
					vis[x+p.ff][y+p.ss] = true;
					Q.push(mp(x+p.ff, y+p.ss));
				}
		}
		bool found = false;
		for(pair<int, int> p : {mp(0, -1), mp(0, 1), mp(1, 0), mp(-1, 0)})
				if(inside(H	+ p.ff, K+p.ss)&&(disM[H + p.ff][K + p.ss] != inf))
					lo = mid, found = true;
		if(!found)	hi = mid;
		// F0R(i, N)	
		// {
		// 	F0R(j, N)
		// 		if(disM[i][j] == inf) cout<<'-' ;
		// 		else cout<<disM[i][j];
		// 	cout<<'\n';
		// }
	}
	mid = 0;//(lo + hi)/2;
	// cout<<"mid = "<<mid<<'\n';
	F0R(i, N)
		F0R(j, N)
			vis[i][j] = false, disM[i][j] = inf;
	vis[X][Y] = true;
	disM[X][Y] = 0;
	Q.push(mp(X, Y));
	while(!Q.empty())
	{
		int x = Q.front().ff, y = Q.front().ss;
		Q.pop();
		// cout<<"disM["<<x<<"]["<<y<<"] = "<<disM[x][y]<<'\n';
		if (disB[x][y] <= mid + (disM[x][y])/S)
		{
			disM[x][y] = inf;
			// cout<<x<<','<<y<<" is unreachable\n";
			continue;
		}
		// else
		// {
		// 	cout<<"doable as "<<disB[x][y]<<" >= "<<mid<<"+"<<disM[x][y]<<'/'<<S<<" = "<<mid + disM[x][y]/S<<'\n';
		// }
		for(pair<int, int> p : {mp(0, -1), mp(0, 1), mp(1, 0), mp(-1, 0)})
			if(inside(x+p.ff, y+p.ss)&&(!vis[x+p.ff][y+p.ss])&&(grid[x+p.ff][y+p.ss] == 'G' or grid[x+p.ff][y+p.ss] == 'D'))
			{
				disM[x+p.ff][y+p.ss] = disM[x][y] + 1;
				vis[x+p.ff][y+p.ss] = true;
				Q.push(mp(x+p.ff, y+p.ss));
			}
	}

	bool found = false;
	for(pair<int, int> p : {mp(0, -1), mp(0, 1), mp(1, 0), mp(-1, 0)})
			if(inside(H	+ p.ff, K+p.ss)&&(disM[H + p.ff][K + p.ss] != inf))
				found = true;
	// F0R(i, N)	
	// {
	// 	F0R(j, N)
	// 		if(disM[i][j] == inf) cout<<'-' ;
	// 		else cout<<disM[i][j];
	// 	cout<<' '<<'\n';
	// }



	cout<<((!found) ? -1 : lo );

	return 0;
}

Subtask #1
60.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 116 ms 7544 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 4 ms 512 KB Output is correct
10 Correct 5 ms 512 KB Output is correct
11 Correct 5 ms 512 KB Output is correct
12 Incorrect 5 ms 896 KB Output isn't correct
13 Incorrect 5 ms 768 KB Output isn't correct
14 Correct 5 ms 896 KB Output is correct
15 Correct 5 ms 512 KB Output is correct
16 Correct 5 ms 512 KB Output is correct
17 Correct 5 ms 512 KB Output is correct
18 Correct 5 ms 512 KB Output is correct
19 Correct 5 ms 640 KB Output is correct
20 Correct 5 ms 640 KB Output is correct
21 Correct 5 ms 640 KB Output is correct
22 Correct 5 ms 640 KB Output is correct
23 Correct 5 ms 768 KB Output is correct
24 Correct 5 ms 768 KB Output is correct
25 Correct 5 ms 896 KB Output is correct
26 Correct 5 ms 896 KB Output is correct
27 Correct 5 ms 896 KB Output is correct
28 Correct 5 ms 896 KB Output is correct
29 Correct 5 ms 896 KB Output is correct
30 Correct 5 ms 1024 KB Output is correct
31 Correct 5 ms 1024 KB Output is correct
32 Correct 5 ms 1024 KB Output is correct
33 Incorrect 22 ms 3456 KB Output isn't correct
34 Incorrect 26 ms 3456 KB Output isn't correct
35 Correct 31 ms 3456 KB Output is correct
36 Incorrect 26 ms 3840 KB Output isn't correct
37 Incorrect 32 ms 3840 KB Output isn't correct
38 Correct 38 ms 3840 KB Output is correct
39 Incorrect 32 ms 4352 KB Output isn't correct
40 Incorrect 42 ms 4352 KB Output isn't correct
41 Correct 46 ms 4352 KB Output is correct
42 Incorrect 38 ms 4736 KB Output isn't correct
43 Incorrect 48 ms 4736 KB Output isn't correct
44 Correct 58 ms 4736 KB Output is correct
45 Incorrect 47 ms 5240 KB Output isn't correct
46 Incorrect 57 ms 5236 KB Output isn't correct
47 Correct 77 ms 5256 KB Output is correct
48 Incorrect 54 ms 5632 KB Output isn't correct
49 Incorrect 70 ms 5752 KB Output isn't correct
50 Correct 90 ms 5632 KB Output is correct
51 Incorrect 62 ms 6016 KB Output isn't correct
52 Incorrect 80 ms 6144 KB Output isn't correct
53 Correct 104 ms 6016 KB Output is correct
54 Incorrect 71 ms 6532 KB Output isn't correct
55 Incorrect 92 ms 6648 KB Output isn't correct
56 Correct 115 ms 6528 KB Output is correct
57 Incorrect 84 ms 7032 KB Output isn't correct
58 Incorrect 108 ms 7032 KB Output isn't correct
59 Correct 142 ms 6904 KB Output is correct
60 Incorrect 92 ms 7416 KB Output isn't correct
61 Incorrect 122 ms 7424 KB Output isn't correct
62 Correct 146 ms 7544 KB Output is correct
63 Correct 125 ms 7488 KB Output is correct
64 Correct 223 ms 7544 KB Output is correct
65 Correct 199 ms 7444 KB Output is correct
66 Correct 179 ms 7520 KB Output is correct
67 Correct 137 ms 7416 KB Output is correct
68 Correct 66 ms 7416 KB Output is correct
69 Correct 77 ms 7416 KB Output is correct
70 Correct 63 ms 7416 KB Output is correct
71 Correct 55 ms 7416 KB Output is correct
72 Incorrect 59 ms 7416 KB Output isn't correct
73 Incorrect 95 ms 7680 KB Output isn't correct
74 Correct 96 ms 7672 KB Output is correct
75 Correct 94 ms 7672 KB Output is correct
76 Correct 79 ms 7680 KB Output is correct
77 Correct 97 ms 7680 KB Output is correct
78 Correct 98 ms 7672 KB Output is correct
79 Correct 89 ms 7672 KB Output is correct
80 Correct 91 ms 7672 KB Output is correct
81 Correct 101 ms 7808 KB Output is correct
82 Correct 90 ms 7672 KB Output is correct
83 Correct 91 ms 7544 KB Output is correct
84 Correct 109 ms 7660 KB Output is correct
85 Correct 95 ms 7544 KB Output is correct
86 Correct 104 ms 7544 KB Output is correct
87 Correct 105 ms 7664 KB Output is correct
88 Correct 103 ms 7544 KB Output is correct
89 Correct 119 ms 7556 KB Output is correct
90 Correct 118 ms 7672 KB Output is correct
91 Correct 110 ms 7544 KB Output is correct
92 Correct 108 ms 7548 KB Output is correct