oj.uz

Submission #1088866

# Submission time Handle Problem Language Result Execution time Memory
1088866 2024-09-15T11:21:15 Z StefanSebez Mecho (IOI09_mecho) C++14
71 / 100
 160 ms 8020 KB 
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define ll long long
#define ld long double
const int inf=1e9;
vector<string>a;
bool was[850][850];
int depth[850][850],dist[850][850],n,S;
bool Dobar(int x,int y){
	if(x<0||x>=n||y<0||y>=n||a[x][y]=='T'||was[x][y]) return false;
	return true;
}
int main(){
    scanf("%i%i",&n,&S);
    for(int i=0;i<n;i++){string s;cin>>s;a.pb(s);}
    int X0,Y0,X1,Y1;
    vector<pair<int,int> >H;
    for(int i=0;i<n;i++) for(int j=0;j<n;j++){if(a[i][j]=='M'){X0=i,Y0=j;}if(a[i][j]=='H')H.pb({i,j});if(a[i][j]=='D'){X1=i,Y1=j;}}
    queue<pair<int,int> >kju;
    for(auto i:H){kju.push(i);was[i.fi][i.se]=true;}
    while(kju.size()){
		int u=kju.front().fi,v=kju.front().se;kju.pop();
		if(Dobar(u-1,v)){depth[u-1][v]=depth[u][v]+1;was[u-1][v]=true;kju.push({u-1,v});}
		if(Dobar(u+1,v)){depth[u+1][v]=depth[u][v]+1;was[u+1][v]=true;kju.push({u+1,v});}
		if(Dobar(u,v-1)){depth[u][v-1]=depth[u][v]+1;was[u][v-1]=true;kju.push({u,v-1});}
		if(Dobar(u,v+1)){depth[u][v+1]=depth[u][v]+1;was[u][v+1]=true;kju.push({u,v+1});}
    }
    depth[X1][Y1]=inf;
    //for(int i=0;i<n;i++) {for(int j=0;j<n;j++) printf("%i ",depth[i][j]);printf("\n");}
    int l=0,r=5000,res=-1;
    while(l<=r){
		//printf("%i %i**\n",l,r);
		int mid=l+r>>1;
		for(int i=0;i<=n;i++) for(int j=0;j<=n;j++) {dist[i][j]=0;was[i][j]=false;}
		kju.push({X0,Y0});was[X0][Y0]=true;
		bool moze=false;
		for(int i=S,dst=mid;kju.size();i+=S,dst++){
			while(kju.size()){
				int u=kju.front().fi,v=kju.front().se;
				//printf("%i %i %i\n",u,v,dst);
				if(depth[u][v]<=dst){kju.pop();continue;}
				if(u==X1&&v==Y1) moze=true;
				if(dist[u][v]==i) break;
				kju.pop();
				if(Dobar(u-1,v)&&depth[u-1][v]>dst){dist[u-1][v]=dist[u][v]+1;was[u-1][v]=true;kju.push({u-1,v});}
				if(Dobar(u+1,v)&&depth[u+1][v]>dst){dist[u+1][v]=dist[u][v]+1;was[u+1][v]=true;kju.push({u+1,v});}
				if(Dobar(u,v-1)&&depth[u][v-1]>dst){dist[u][v-1]=dist[u][v]+1;was[u][v-1]=true;kju.push({u,v-1});}
				if(Dobar(u,v+1)&&depth[u][v+1]>dst){dist[u][v+1]=dist[u][v]+1;was[u][v+1]=true;kju.push({u,v+1});}
			}
		}
		if(moze) res=mid,l=mid+1;
		else r=mid-1;
    }
    printf("%i\n",res);
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:36:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   36 |   int mid=l+r>>1;
      |           ~^~
mecho.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     scanf("%i%i",&n,&S);
      |     ~~~~~^~~~~~~~~~~~~~
mecho.cpp:38:32: warning: 'Y0' may be used uninitialized in this function [-Wmaybe-uninitialized]
   38 |   kju.push({X0,Y0});was[X0][Y0]=true;
      |                     ~~~~~~~~~~~^~~~~
mecho.cpp:38:32: warning: 'X0' may be used uninitialized in this function [-Wmaybe-uninitialized]
mecho.cpp:45:13: warning: 'Y1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   45 |     if(u==X1&&v==Y1) moze=true;
      |        ~~~~~^~~~~~~
mecho.cpp:45:5: warning: 'X1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   45 |     if(u==X1&&v==Y1) moze=true;
      |     ^~

Subtask #1
71.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 508 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 61 ms 7832 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Incorrect 1 ms 860 KB Output isn't correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 704 KB Output is correct
15 Correct 0 ms 604 KB Output is correct
16 Correct 0 ms 604 KB Output is correct
17 Correct 0 ms 604 KB Output is correct
18 Correct 0 ms 604 KB Output is correct
19 Correct 0 ms 604 KB Output is correct
20 Correct 1 ms 604 KB Output is correct
21 Correct 0 ms 708 KB Output is correct
22 Correct 0 ms 604 KB Output is correct
23 Correct 1 ms 604 KB Output is correct
24 Correct 0 ms 604 KB Output is correct
25 Correct 0 ms 860 KB Output is correct
26 Correct 1 ms 860 KB Output is correct
27 Correct 1 ms 860 KB Output is correct
28 Correct 1 ms 860 KB Output is correct
29 Correct 1 ms 860 KB Output is correct
30 Correct 1 ms 860 KB Output is correct
31 Correct 1 ms 860 KB Output is correct
32 Correct 1 ms 860 KB Output is correct
33 Incorrect 12 ms 3164 KB Output isn't correct
34 Incorrect 14 ms 3164 KB Output isn't correct
35 Correct 16 ms 3164 KB Output is correct
36 Incorrect 16 ms 3676 KB Output isn't correct
37 Incorrect 19 ms 3796 KB Output isn't correct
38 Correct 20 ms 3676 KB Output is correct
39 Incorrect 19 ms 4188 KB Output isn't correct
40 Incorrect 26 ms 4184 KB Output isn't correct
41 Correct 26 ms 4188 KB Output is correct
42 Incorrect 25 ms 4700 KB Output isn't correct
43 Incorrect 30 ms 4700 KB Output isn't correct
44 Correct 31 ms 4700 KB Output is correct
45 Incorrect 30 ms 4956 KB Output isn't correct
46 Incorrect 37 ms 4956 KB Output isn't correct
47 Correct 38 ms 4956 KB Output is correct
48 Incorrect 40 ms 5672 KB Output isn't correct
49 Incorrect 49 ms 5464 KB Output isn't correct
50 Correct 49 ms 5676 KB Output is correct
51 Incorrect 42 ms 5980 KB Output isn't correct
52 Incorrect 52 ms 5980 KB Output isn't correct
53 Correct 59 ms 5980 KB Output is correct
54 Incorrect 49 ms 6456 KB Output isn't correct
55 Incorrect 61 ms 6488 KB Output isn't correct
56 Correct 66 ms 6684 KB Output is correct
57 Incorrect 58 ms 6972 KB Output isn't correct
58 Incorrect 95 ms 7196 KB Output isn't correct
59 Correct 85 ms 6996 KB Output is correct
60 Incorrect 63 ms 7508 KB Output isn't correct
61 Incorrect 80 ms 7512 KB Output isn't correct
62 Correct 84 ms 7728 KB Output is correct
63 Correct 83 ms 7516 KB Output is correct
64 Correct 160 ms 7508 KB Output is correct
65 Correct 117 ms 7504 KB Output is correct
66 Correct 99 ms 7512 KB Output is correct
67 Correct 93 ms 7508 KB Output is correct
68 Correct 42 ms 7508 KB Output is correct
69 Correct 41 ms 7516 KB Output is correct
70 Correct 32 ms 7508 KB Output is correct
71 Correct 37 ms 7768 KB Output is correct
72 Correct 30 ms 7768 KB Output is correct
73 Correct 30 ms 8016 KB Output is correct
74 Correct 44 ms 7928 KB Output is correct
75 Correct 51 ms 7968 KB Output is correct
76 Correct 46 ms 8020 KB Output is correct
77 Correct 45 ms 8020 KB Output is correct
78 Correct 61 ms 7772 KB Output is correct
79 Correct 38 ms 7772 KB Output is correct
80 Correct 45 ms 7764 KB Output is correct
81 Correct 52 ms 7772 KB Output is correct
82 Correct 45 ms 7896 KB Output is correct
83 Correct 56 ms 7948 KB Output is correct
84 Correct 54 ms 7760 KB Output is correct
85 Correct 55 ms 7712 KB Output is correct
86 Correct 55 ms 7760 KB Output is correct
87 Correct 53 ms 7772 KB Output is correct
88 Correct 58 ms 7812 KB Output is correct
89 Correct 58 ms 7764 KB Output is correct
90 Correct 58 ms 7736 KB Output is correct
91 Correct 57 ms 7892 KB Output is correct
92 Correct 70 ms 7772 KB Output is correct