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Submission #1012855

# Submission time Handle Problem Language Result Execution time Memory
1012855 2024-07-02T17:39:12 Z EkinOnal Mecho (IOI09_mecho) C++17
89 / 100
 487 ms 12368 KB 
	//#pragma GCC optimize("O3,unroll-loops,Ofast")
//#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#include <bits/stdc++.h>
//#include <cstdio>
//#include <iostream>
using namespace std;
 
#define MAX 100000007
#define pb push_back
//#define mp make_pair 
#define int long long
#define f first
#define s second
#define vi vector<int>
#define pii pair<int,int>
#define si set<int>
#define vpii vector<pair<int,int>> 
const int mod = 1e9+7;
const int INF = 1e18;
// myMap.begin()->first :  key
// myMap.begin()->second : value
 
int epow(int a,int b){int ans=1;while(b){if(b&1) ans*=a;a*=a;ans%=mod;a%=mod;b>>=1;}return ans%mod;}
int gcd(int a,int b) {if(a<b)swap(a,b);while(b){int tmp=b;b=a%b;a=tmp;}return a;}
int mul(int a,int b){return ((a%mod)*(b%mod))%mod;}


int dx[] = {-1, 0, 1, 0};
int dy[] = {0, -1, 0, 1};


int n,s;
vector<vector<char>> grid(1000,vector<char>(1000));
bool valid_sq(int x, int y) {
	return x >= 0 && x < n && y >= 0 && y < n &&
	       (grid[x][y] == 'G' || grid[x][y] == 'M');
}

bool mecho_reached(int mecho_dis, int bees_dis) {
	return mecho_dis / s < bees_dis;
}




void solve() {
	cin >> n >> s;

	pii bear,home;
	vector<pii> hives;
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<n;j++)
		{
			cin >> grid[i][j];
			if(grid[i][j]=='H') hives.pb({i,j});
			if(grid[i][j]=='M') bear = {i,j};
			if(grid[i][j]=='D') home = {i,j};
		}
	}


	int l=0,r=n*n;
	while(l<=r)
	{
		vector<vector<int>> d(n+2,vector<int>(n+2,INF));
		queue<pii> q;
		for(int i=0;i<hives.size();i++)
		{
			q.push({hives[i]});
			d[hives[i].f][hives[i].s]=0;
		}	

		while(q.size())
		{
			int x = q.front().first, y = q.front().second;
			q.pop();
			for (int i=0;i<4;i++)
			{
				int nx = x + dx[i], ny = y + dy[i];
				if (valid_sq(nx, ny) && d[nx][ny]==INF) 
				{
					d[nx][ny] = d[x][y] + 1;
					q.push({nx, ny});
				}
			}
		}



		int time = (l+r)/2;

	//	queue<pii> q; 
		q = queue<pii>();
		vector<vi> dbear(n+2,vi(n+2,INF));

		q.push(bear);
		dbear[bear.f][bear.s]=0;
		while(q.size())
		{
			int x = q.front().first, y = q.front().second;
			q.pop();
			for (int i=0;i<4;i++)
			{
				int nx=x+dx[i],ny=y+dy[i];
				if (valid_sq(nx, ny) && dbear[nx][ny]==INF  &&mecho_reached(dbear[x][y]+1,d[nx][ny]-time)) 
				{
					q.push({nx, ny});
					dbear[nx][ny] = dbear[x][y] + 1;
				}
			}
		}


		bool flag = false;
		for (int i = 0; i < 4; i++) 
		{
			int nx = home.f + dx[i], ny = home.s + dy[i];
			if (valid_sq(nx, ny) &&mecho_reached(dbear[nx][ny],d[nx][ny]-time) && dbear[nx][ny]!=INF) flag = true;
		}
		if (flag) l = time + 1;
		else  r = time - 1;


	}
	cout << l-1 << endl;

    return;
}	


int32_t main() {
//	freopen("lasers.in", "r", stdin);
//	freopen("lasers.out", "w", stdout);
	std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int t=1;
 //   cin >> t;
    while (t--) solve();

    return 0;
}

Compilation message

mecho.cpp: In function 'void solve()':
mecho.cpp:68:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |   for(int i=0;i<hives.size();i++)
      |               ~^~~~~~~~~~~~~

Subtask #1
89.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1368 KB Output is correct
2 Correct 1 ms 1372 KB Output is correct
3 Correct 2 ms 1372 KB Output is correct
4 Correct 2 ms 1240 KB Output is correct
5 Correct 1 ms 1628 KB Output is correct
6 Correct 1 ms 1464 KB Output is correct
7 Correct 338 ms 12264 KB Output is correct
8 Correct 1 ms 1368 KB Output is correct
9 Correct 1 ms 1372 KB Output is correct
10 Correct 2 ms 1372 KB Output is correct
11 Correct 1 ms 1372 KB Output is correct
12 Correct 2 ms 1372 KB Output is correct
13 Incorrect 2 ms 1372 KB Output isn't correct
14 Correct 2 ms 1372 KB Output is correct
15 Correct 1 ms 1372 KB Output is correct
16 Correct 1 ms 1372 KB Output is correct
17 Correct 1 ms 1372 KB Output is correct
18 Correct 1 ms 1372 KB Output is correct
19 Correct 1 ms 1372 KB Output is correct
20 Correct 1 ms 1372 KB Output is correct
21 Correct 1 ms 1372 KB Output is correct
22 Correct 1 ms 1372 KB Output is correct
23 Correct 1 ms 1372 KB Output is correct
24 Correct 2 ms 1372 KB Output is correct
25 Correct 2 ms 1372 KB Output is correct
26 Correct 2 ms 1372 KB Output is correct
27 Correct 2 ms 1492 KB Output is correct
28 Correct 2 ms 1372 KB Output is correct
29 Correct 2 ms 1372 KB Output is correct
30 Correct 2 ms 1372 KB Output is correct
31 Correct 2 ms 1372 KB Output is correct
32 Correct 2 ms 1464 KB Output is correct
33 Correct 38 ms 3548 KB Output is correct
34 Correct 30 ms 3580 KB Output is correct
35 Correct 52 ms 3604 KB Output is correct
36 Correct 42 ms 4232 KB Output is correct
37 Correct 39 ms 4240 KB Output is correct
38 Correct 70 ms 4188 KB Output is correct
39 Correct 54 ms 4932 KB Output is correct
40 Correct 68 ms 4980 KB Output is correct
41 Correct 86 ms 4920 KB Output is correct
42 Correct 72 ms 5708 KB Output is correct
43 Correct 64 ms 5732 KB Output is correct
44 Correct 105 ms 5704 KB Output is correct
45 Correct 89 ms 6792 KB Output is correct
46 Correct 75 ms 6608 KB Output is correct
47 Correct 125 ms 6572 KB Output is correct
48 Correct 99 ms 7576 KB Output is correct
49 Correct 99 ms 7732 KB Output is correct
50 Correct 145 ms 7544 KB Output is correct
51 Correct 124 ms 8660 KB Output is correct
52 Correct 147 ms 8592 KB Output is correct
53 Correct 227 ms 8588 KB Output is correct
54 Correct 136 ms 9728 KB Output is correct
55 Correct 118 ms 9760 KB Output is correct
56 Correct 215 ms 9724 KB Output is correct
57 Correct 170 ms 10916 KB Output is correct
58 Correct 139 ms 10952 KB Output is correct
59 Correct 259 ms 10928 KB Output is correct
60 Correct 181 ms 12248 KB Output is correct
61 Correct 164 ms 12256 KB Output is correct
62 Correct 295 ms 12224 KB Output is correct
63 Correct 402 ms 12220 KB Output is correct
64 Correct 487 ms 12232 KB Output is correct
65 Correct 438 ms 12248 KB Output is correct
66 Correct 391 ms 12236 KB Output is correct
67 Correct 406 ms 12244 KB Output is correct
68 Correct 344 ms 12244 KB Output is correct
69 Correct 368 ms 12232 KB Output is correct
70 Correct 362 ms 12248 KB Output is correct
71 Correct 381 ms 12252 KB Output is correct
72 Incorrect 335 ms 12256 KB Output isn't correct
73 Incorrect 309 ms 12304 KB Output isn't correct
74 Correct 348 ms 12296 KB Output is correct
75 Correct 341 ms 12268 KB Output is correct
76 Correct 354 ms 12296 KB Output is correct
77 Correct 372 ms 12312 KB Output is correct
78 Correct 319 ms 12288 KB Output is correct
79 Correct 304 ms 12272 KB Output is correct
80 Correct 334 ms 12368 KB Output is correct
81 Correct 318 ms 12292 KB Output is correct
82 Correct 337 ms 12360 KB Output is correct
83 Correct 339 ms 12300 KB Output is correct
84 Correct 349 ms 12284 KB Output is correct
85 Correct 340 ms 12272 KB Output is correct
86 Correct 323 ms 12248 KB Output is correct
87 Correct 338 ms 12300 KB Output is correct
88 Correct 328 ms 12252 KB Output is correct
89 Correct 327 ms 12288 KB Output is correct
90 Correct 356 ms 12300 KB Output is correct
91 Correct 377 ms 12276 KB Output is correct
92 Correct 360 ms 12292 KB Output is correct