oj.uz

Submission #295850

# Submission time Handle Problem Language Result Execution time Memory
295850 2020-09-10T04:26:29 Z Hemimor Mecho (IOI09_mecho) C++14
100 / 100
 312 ms 6388 KB 
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <numeric>
#include <cassert>
#include <vector>
#include <cmath>
#include <queue>
#include <set>
#include <map>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<P,int> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ll mod=1e9+7;
const int dx[4]={-1,0,1,0},dy[4]={0,-1,0,1};

int n,m;
vvi b;
vs a;

bool f(int t){
	queue<P> q;
	vvi c(n,vi(n,inf));
	int gx,gy;
	for(int i=0;i<n;i++) for(int j=0;j<n;j++){
		if(a[i][j]=='M'){
			q.push({i,j});
			c[i][j]=0;
			if(t>=b[i][j]) return 0;
		}
		if(a[i][j]=='D') gx=i,gy=j;
	}
	while(!q.empty()){
		P p=q.front();q.pop();
		int i=p.first,j=p.second;
		for(int k=0;k<4;k++){
			int x=i+dx[k],y=j+dy[k];
			if(x>=0&&x<n&&y>=0&&y<n&&a[x][y]!='T'&&c[x][y]==inf&&t+(c[i][j]+1)/m<b[x][y]){
				q.push({x,y});
				c[x][y]=c[i][j]+1;
			}
		}
	}
	return c[gx][gy]<inf;
}

int main(){
	cin>>n>>m;
	a=vs(n);
	b=vvi(n,vi(n,inf));
	for(auto &i:a) cin>>i;
	queue<P> q;
	for(int i=0;i<n;i++) for(int j=0;j<n;j++) if(a[i][j]=='H'){
		b[i][j]=0;
		q.push({i,j});
	}
	while(!q.empty()){
		P p=q.front();q.pop();
		int i=p.first,j=p.second;
		for(int k=0;k<4;k++){
			int x=i+dx[k],y=j+dy[k];
			if(x>=0&&x<n&&y>=0&&y<n&&a[x][y]!='T'&&a[x][y]!='D'&&b[x][y]==inf){
				q.push({x,y});
				b[x][y]=b[i][j]+1;
			}
		}
	}
	int l=-1,r=n*n;
	while(r-l>1){
		int m=(l+r)/2;
		if(f(m)) l=m;
		else r=m;
	}
	cout<<l<<endl;
}

Compilation message

mecho.cpp: In function 'bool f(int)':
mecho.cpp:65:17: warning: 'gy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   65 |  return c[gx][gy]<inf;
      |                 ^
mecho.cpp:65:13: warning: 'gx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   65 |  return c[gx][gy]<inf;
      |             ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 0 ms 256 KB Output is correct
7 Correct 182 ms 6280 KB Output is correct
8 Correct 0 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 1 ms 256 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 0 ms 256 KB Output is correct
17 Correct 0 ms 256 KB Output is correct
18 Correct 1 ms 256 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 0 ms 256 KB Output is correct
21 Correct 1 ms 384 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 1 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 1 ms 384 KB Output is correct
31 Correct 1 ms 384 KB Output is correct
32 Correct 1 ms 384 KB Output is correct
33 Correct 14 ms 1528 KB Output is correct
34 Correct 15 ms 1528 KB Output is correct
35 Correct 39 ms 1528 KB Output is correct
36 Correct 18 ms 1892 KB Output is correct
37 Correct 24 ms 1888 KB Output is correct
38 Correct 47 ms 1888 KB Output is correct
39 Correct 24 ms 2196 KB Output is correct
40 Correct 28 ms 2196 KB Output is correct
41 Correct 65 ms 2200 KB Output is correct
42 Correct 30 ms 2840 KB Output is correct
43 Correct 32 ms 2848 KB Output is correct
44 Correct 84 ms 2896 KB Output is correct
45 Correct 40 ms 3308 KB Output is correct
46 Correct 39 ms 3288 KB Output is correct
47 Correct 97 ms 3352 KB Output is correct
48 Correct 44 ms 3856 KB Output is correct
49 Correct 47 ms 3876 KB Output is correct
50 Correct 118 ms 3836 KB Output is correct
51 Correct 51 ms 4408 KB Output is correct
52 Correct 56 ms 4400 KB Output is correct
53 Correct 144 ms 4388 KB Output is correct
54 Correct 61 ms 4980 KB Output is correct
55 Correct 67 ms 4976 KB Output is correct
56 Correct 170 ms 4948 KB Output is correct
57 Correct 72 ms 5588 KB Output is correct
58 Correct 75 ms 5576 KB Output is correct
59 Correct 192 ms 5612 KB Output is correct
60 Correct 82 ms 6272 KB Output is correct
61 Correct 90 ms 6272 KB Output is correct
62 Correct 222 ms 6360 KB Output is correct
63 Correct 192 ms 6388 KB Output is correct
64 Correct 312 ms 6268 KB Output is correct
65 Correct 248 ms 6232 KB Output is correct
66 Correct 214 ms 6248 KB Output is correct
67 Correct 206 ms 6244 KB Output is correct
68 Correct 116 ms 6264 KB Output is correct
69 Correct 116 ms 6236 KB Output is correct
70 Correct 101 ms 6324 KB Output is correct
71 Correct 110 ms 6276 KB Output is correct
72 Correct 93 ms 6324 KB Output is correct
73 Correct 88 ms 6268 KB Output is correct
74 Correct 126 ms 6256 KB Output is correct
75 Correct 148 ms 6280 KB Output is correct
76 Correct 134 ms 6304 KB Output is correct
77 Correct 133 ms 6272 KB Output is correct
78 Correct 156 ms 6272 KB Output is correct
79 Correct 122 ms 6300 KB Output is correct
80 Correct 132 ms 6256 KB Output is correct
81 Correct 148 ms 6284 KB Output is correct
82 Correct 135 ms 6308 KB Output is correct
83 Correct 156 ms 6256 KB Output is correct
84 Correct 142 ms 6348 KB Output is correct
85 Correct 152 ms 6280 KB Output is correct
86 Correct 150 ms 6256 KB Output is correct
87 Correct 149 ms 6280 KB Output is correct
88 Correct 159 ms 6356 KB Output is correct
89 Correct 157 ms 6272 KB Output is correct
90 Correct 160 ms 6260 KB Output is correct
91 Correct 158 ms 6260 KB Output is correct
92 Correct 171 ms 6276 KB Output is correct