oj.uz

Submission #295849

# Submission time Handle Problem Language Result Execution time Memory
295849 2020-09-10T04:24:53 Z Hemimor Mecho (IOI09_mecho) C++14
84 / 100
 310 ms 7040 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'&&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
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Incorrect 0 ms 256 KB Output isn't correct
3 Correct 1 ms 256 KB Output is correct
4 Incorrect 0 ms 256 KB Output isn't correct
5 Correct 1 ms 256 KB Output is correct
6 Incorrect 1 ms 256 KB Output isn't correct
7 Incorrect 170 ms 6988 KB Output isn't correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 1 ms 256 KB Output is correct
12 Incorrect 1 ms 384 KB Output isn't correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 256 KB Output is correct
16 Correct 1 ms 256 KB Output is correct
17 Correct 1 ms 256 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 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 1648 KB Output is correct
34 Correct 16 ms 1648 KB Output is correct
35 Correct 37 ms 1684 KB Output is correct
36 Correct 18 ms 2012 KB Output is correct
37 Correct 21 ms 2016 KB Output is correct
38 Correct 47 ms 2020 KB Output is correct
39 Correct 23 ms 2400 KB Output is correct
40 Correct 29 ms 2580 KB Output is correct
41 Correct 65 ms 2424 KB Output is correct
42 Correct 31 ms 3128 KB Output is correct
43 Correct 33 ms 3096 KB Output is correct
44 Correct 84 ms 3100 KB Output is correct
45 Correct 37 ms 3680 KB Output is correct
46 Correct 39 ms 3608 KB Output is correct
47 Correct 101 ms 3664 KB Output is correct
48 Correct 44 ms 4184 KB Output is correct
49 Correct 50 ms 4196 KB Output is correct
50 Correct 115 ms 4248 KB Output is correct
51 Correct 53 ms 4820 KB Output is correct
52 Correct 57 ms 5072 KB Output is correct
53 Correct 147 ms 4796 KB Output is correct
54 Correct 61 ms 5432 KB Output is correct
55 Correct 66 ms 5496 KB Output is correct
56 Correct 170 ms 5456 KB Output is correct
57 Correct 70 ms 6164 KB Output is correct
58 Correct 76 ms 6260 KB Output is correct
59 Correct 194 ms 6128 KB Output is correct
60 Correct 81 ms 7000 KB Output is correct
61 Correct 89 ms 6940 KB Output is correct
62 Correct 218 ms 7040 KB Output is correct
63 Correct 192 ms 6912 KB Output is correct
64 Correct 310 ms 6880 KB Output is correct
65 Correct 248 ms 7004 KB Output is correct
66 Correct 214 ms 7008 KB Output is correct
67 Correct 216 ms 6996 KB Output is correct
68 Correct 116 ms 6904 KB Output is correct
69 Correct 118 ms 6976 KB Output is correct
70 Correct 99 ms 6940 KB Output is correct
71 Correct 110 ms 7040 KB Output is correct
72 Correct 92 ms 6916 KB Output is correct
73 Correct 91 ms 6912 KB Output is correct
74 Correct 126 ms 6988 KB Output is correct
75 Correct 148 ms 6912 KB Output is correct
76 Correct 133 ms 6912 KB Output is correct
77 Correct 136 ms 6912 KB Output is correct
78 Correct 162 ms 6980 KB Output is correct
79 Correct 123 ms 6928 KB Output is correct
80 Correct 138 ms 6988 KB Output is correct
81 Correct 143 ms 6896 KB Output is correct
82 Correct 137 ms 6912 KB Output is correct
83 Correct 153 ms 6912 KB Output is correct
84 Correct 144 ms 6908 KB Output is correct
85 Correct 155 ms 6920 KB Output is correct
86 Correct 146 ms 7036 KB Output is correct
87 Correct 150 ms 7024 KB Output is correct
88 Correct 157 ms 6900 KB Output is correct
89 Correct 159 ms 7024 KB Output is correct
90 Correct 165 ms 6960 KB Output is correct
91 Correct 164 ms 6912 KB Output is correct
92 Correct 170 ms 6912 KB Output is correct