oj.uz

Submission #1088874

# Submission time Handle Problem Language Result Execution time Memory
1088874 2024-09-15T11:47:18 Z StefanSebez Mecho (IOI09_mecho) C++14
76 / 100
 153 ms 8132 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;}}
    for(int i=0;i<=n;i++) for(int j=0;j<=n;j++) depth[i][j]=inf;
    queue<pair<int,int> >kju;
    for(auto i:H){kju.push(i);was[i.fi][i.se]=true;depth[i.fi][i.se]=0;}
    while(kju.size()){
		int u=kju.front().fi,v=kju.front().se;kju.pop();
		if(Dobar(u-1,v)&&!(u-1==X1&&v==Y1)){depth[u-1][v]=depth[u][v]+1;was[u-1][v]=true;kju.push({u-1,v});}
		if(Dobar(u+1,v)&&!(u+1==X1&&v==Y1)){depth[u+1][v]=depth[u][v]+1;was[u+1][v]=true;kju.push({u+1,v});}
		if(Dobar(u,v-1)&&!(u==X1&&v-1==Y1)){depth[u][v-1]=depth[u][v]+1;was[u][v-1]=true;kju.push({u,v-1});}
		if(Dobar(u,v+1)&&!(u==X1&&v+1==Y1)){depth[u][v+1]=depth[u][v]+1;was[u][v+1]=true;kju.push({u,v+1});}
    }
    //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;}
		if(depth[X0][Y0]>mid) 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(u==X1&&v==Y1) moze=true;
				if(depth[u][v]<=dst){kju.pop();continue;}
				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:38:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   38 |   if(depth[X0][Y0]>mid) kju.push({X0,Y0});was[X0][Y0]=true;
      |   ^~
mecho.cpp:38:43: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   38 |   if(depth[X0][Y0]>mid) kju.push({X0,Y0});was[X0][Y0]=true;
      |                                           ^~~
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:38:18: warning: 'Y0' may be used uninitialized in this function [-Wmaybe-uninitialized]
   38 |   if(depth[X0][Y0]>mid) kju.push({X0,Y0});was[X0][Y0]=true;
      |      ~~~~~~~~~~~~^
mecho.cpp:38:18: warning: 'X0' may be used uninitialized in this function [-Wmaybe-uninitialized]
mecho.cpp:44:13: warning: 'Y1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   44 |     if(u==X1&&v==Y1) moze=true;
      |        ~~~~~^~~~~~~
mecho.cpp:44:5: warning: 'X1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   44 |     if(u==X1&&v==Y1) moze=true;
      |     ^~

Subtask #1
76.0 / 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 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 61 ms 7836 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 436 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 860 KB Output is correct
13 Correct 0 ms 604 KB Output is correct
14 Correct 1 ms 860 KB Output is correct
15 Correct 1 ms 604 KB Output is correct
16 Correct 0 ms 604 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 0 ms 604 KB Output is correct
19 Correct 1 ms 604 KB Output is correct
20 Correct 0 ms 604 KB Output is correct
21 Correct 1 ms 604 KB Output is correct
22 Correct 0 ms 604 KB Output is correct
23 Correct 0 ms 604 KB Output is correct
24 Correct 1 ms 600 KB Output is correct
25 Correct 1 ms 860 KB Output is correct
26 Correct 0 ms 860 KB Output is correct
27 Correct 0 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 14 ms 3352 KB Output isn't correct
34 Incorrect 15 ms 3164 KB Output isn't correct
35 Correct 16 ms 3160 KB Output is correct
36 Incorrect 20 ms 3800 KB Output isn't correct
37 Incorrect 19 ms 3676 KB Output isn't correct
38 Correct 22 ms 3800 KB Output is correct
39 Incorrect 20 ms 4188 KB Output isn't correct
40 Incorrect 24 ms 4184 KB Output isn't correct
41 Correct 25 ms 4256 KB Output is correct
42 Incorrect 25 ms 4696 KB Output isn't correct
43 Incorrect 32 ms 4696 KB Output isn't correct
44 Correct 31 ms 4708 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 39 ms 5212 KB Output is correct
48 Incorrect 37 ms 5468 KB Output isn't correct
49 Incorrect 51 ms 5468 KB Output isn't correct
50 Correct 45 ms 5468 KB Output is correct
51 Incorrect 41 ms 5980 KB Output isn't correct
52 Incorrect 49 ms 6088 KB Output isn't correct
53 Correct 56 ms 5976 KB Output is correct
54 Incorrect 51 ms 6488 KB Output isn't correct
55 Incorrect 64 ms 6688 KB Output isn't correct
56 Correct 65 ms 6692 KB Output is correct
57 Incorrect 55 ms 7004 KB Output isn't correct
58 Incorrect 66 ms 7120 KB Output isn't correct
59 Correct 74 ms 7076 KB Output is correct
60 Incorrect 71 ms 7512 KB Output isn't correct
61 Incorrect 74 ms 7512 KB Output isn't correct
62 Correct 85 ms 7648 KB Output is correct
63 Correct 81 ms 7504 KB Output is correct
64 Correct 153 ms 7504 KB Output is correct
65 Correct 116 ms 7508 KB Output is correct
66 Correct 94 ms 7508 KB Output is correct
67 Correct 92 ms 7504 KB Output is correct
68 Correct 42 ms 8024 KB Output is correct
69 Correct 41 ms 7772 KB Output is correct
70 Correct 33 ms 7772 KB Output is correct
71 Correct 37 ms 7768 KB Output is correct
72 Correct 30 ms 7760 KB Output is correct
73 Correct 27 ms 8028 KB Output is correct
74 Correct 43 ms 7932 KB Output is correct
75 Correct 52 ms 8028 KB Output is correct
76 Correct 48 ms 8020 KB Output is correct
77 Correct 60 ms 8028 KB Output is correct
78 Correct 59 ms 7772 KB Output is correct
79 Correct 43 ms 7772 KB Output is correct
80 Correct 47 ms 7844 KB Output is correct
81 Correct 49 ms 7760 KB Output is correct
82 Correct 45 ms 7760 KB Output is correct
83 Correct 63 ms 7952 KB Output is correct
84 Correct 52 ms 7760 KB Output is correct
85 Correct 55 ms 7956 KB Output is correct
86 Correct 55 ms 7868 KB Output is correct
87 Correct 54 ms 7760 KB Output is correct
88 Correct 62 ms 8132 KB Output is correct
89 Correct 58 ms 7760 KB Output is correct
90 Correct 62 ms 7772 KB Output is correct
91 Correct 59 ms 7900 KB Output is correct
92 Correct 63 ms 7768 KB Output is correct