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Submission #996446

# Submission time Handle Problem Language Result Execution time Memory
996446 2024-06-10T15:42:50 Z ramalzaher Mecho (IOI09_mecho) C++14
100 / 100
 374 ms 9564 KB 
#include<bits/stdc++.h> 
#include<unordered_map>
#include<unordered_set>
using namespace std ;
const int N = 801 ;
const int T = 1000 ; 
int n , s;
char a[N][N] ; 
int dis[N][N] , vis[N][N] ;	
int dx[] = {-1, 0, 1, 0};
int dy[] = {0, -1, 0, 1};
bool valid(int x , int y ) {
return x >= 0 && x < n && y >= 0 && y < n &&
	       (a[x][y] == 'G' || a[x][y] == 'M');}  
void bfs(vector<int> startx , vector<int> starty ){
queue<pair<int,int>> q;	
for (int i = 0; i < startx.size() ; i++)
{
q.push({startx[i] , starty[i] });
vis[startx[i]][starty[i]] = 1 ; 
dis[startx[i]][starty[i]] = 0 ;
}
while(q.size()){
	pair<int,int> p  = q.front() ;
	int x = p.first; 
	int y = p.second ;
	q.pop() ;	
	for (int i = 0; i < 4; i++)
	{
		int newx = x+dx[i];
		int newy = y+dy[i];
		if(valid(newx , newy) && vis[newx][newy] == 0){
		q.push({newx , newy });	
		dis[newx][newy] = dis[x][y]+1;
		vis[newx][newy] = 1 ;
			}
		}	
	}
}
bool viss[N][N] ;int diss[N][N];
int homex ,  homey ; 
 
bool bfss(int startx ,int starty , int TT  ) {
viss[startx][starty] = 1 ; 
diss[startx][starty] = 0 ;
queue<pair<int,int>> q; 
q.push({startx , starty });	
if(dis[startx][starty] <= TT) { q.pop() ; }  
while(q.size()){
auto &[x,y] = q.front() ; 
q.pop();	
	for (int i = 0; i < 4; i++)
	{
		int newx = x+dx[i];
		int newy = y+dy[i];
		if(viss[newx][newy] ==0 && valid(newx, newy) && (dis[newx][newy]-TT) > (((diss[x][y]+1)/s) ) ) {
			q.push( { newx,  newy } ); 
			diss[newx][newy] = diss[x][y]+1 ; 
			viss[newx][newy]= 1;
			}
	}	
}
for (int i = 0; i < 4; i++)
{
	int nx = homex+dx[i]; int ny=homey+dy[i] ;
	if(valid(nx,ny)&& ( diss[nx][ny]/s ) < ( dis[nx][ny]-TT ) && viss[nx][ny] )return 1 ;
}
return 0 ;

} 
void cls(){
	for (int i = 0; i <= n; i++)
	{
	for (int j = 0; j <= n ; j++)
	{
	viss[i][j]=vis[i][j]=0;
	diss[i][j]=0 ; 
	dis[i][j]= 0  ; 
	}
	}
	}

main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
 cin >> n >> s  ; int mx , my ; 
 vector<int> stx , sty ;
for (int i = 0; i < n; i++)
{
	for (int j = 0; j < n ; j++)
	{
		cin >> a[i][j] ;
		if(a[i][j]=='H'){
		stx.push_back(i);
		sty.push_back(j);
		}else if(a[i][j]=='M'){mx=i;my=j;}else if(a[i][j]=='D'){homex=i;homey=j;}
	}
}
int l =0 , r = n*n ; 
while(l <= r ) 
{
cls();
int mid = (l+r)/2 ; 
bfs(stx,sty);
if(bfss(mx,my,mid)) {
	l = mid + 1; 
	}else r = mid - 1; 
}
cout<<l-1<<endl; 
return 0 ; 
}

Compilation message

mecho.cpp: In function 'void bfs(std::vector<int>, std::vector<int>)':
mecho.cpp:17:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 | for (int i = 0; i < startx.size() ; i++)
      |                 ~~^~~~~~~~~~~~~~~
mecho.cpp: In function 'bool bfss(int, int, int)':
mecho.cpp:50:7: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   50 | auto &[x,y] = q.front() ;
      |       ^
mecho.cpp: In function 'void cls()':
mecho.cpp:76:22: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   76 |  viss[i][j]=vis[i][j]=0;
      |             ~~~~~~~~~^~
mecho.cpp: At global scope:
mecho.cpp:83:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   83 | main(){
      | ^~~~
mecho.cpp: In function 'int main()':
mecho.cpp:104:8: warning: 'my' may be used uninitialized in this function [-Wmaybe-uninitialized]
  104 | if(bfss(mx,my,mid)) {
      |    ~~~~^~~~~~~~~~~
mecho.cpp:104:8: warning: 'mx' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 251 ms 9348 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 8796 KB Output is correct
13 Correct 1 ms 6748 KB Output is correct
14 Correct 2 ms 8796 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 1 ms 6488 KB Output is correct
20 Correct 1 ms 6492 KB Output is correct
21 Correct 2 ms 6492 KB Output is correct
22 Correct 1 ms 6492 KB Output is correct
23 Correct 1 ms 6748 KB Output is correct
24 Correct 1 ms 6748 KB Output is correct
25 Correct 1 ms 8796 KB Output is correct
26 Correct 1 ms 8796 KB Output is correct
27 Correct 1 ms 8796 KB Output is correct
28 Correct 2 ms 8792 KB Output is correct
29 Correct 2 ms 8796 KB Output is correct
30 Correct 2 ms 8796 KB Output is correct
31 Correct 2 ms 8796 KB Output is correct
32 Correct 2 ms 8844 KB Output is correct
33 Correct 19 ms 8904 KB Output is correct
34 Correct 18 ms 8796 KB Output is correct
35 Correct 37 ms 8796 KB Output is correct
36 Correct 25 ms 8796 KB Output is correct
37 Correct 24 ms 8796 KB Output is correct
38 Correct 45 ms 8796 KB Output is correct
39 Correct 31 ms 8796 KB Output is correct
40 Correct 30 ms 8792 KB Output is correct
41 Correct 61 ms 8952 KB Output is correct
42 Correct 43 ms 8796 KB Output is correct
43 Correct 43 ms 9052 KB Output is correct
44 Correct 74 ms 8828 KB Output is correct
45 Correct 51 ms 9052 KB Output is correct
46 Correct 48 ms 9048 KB Output is correct
47 Correct 90 ms 9052 KB Output is correct
48 Correct 56 ms 9052 KB Output is correct
49 Correct 67 ms 9068 KB Output is correct
50 Correct 106 ms 9048 KB Output is correct
51 Correct 86 ms 9052 KB Output is correct
52 Correct 63 ms 9048 KB Output is correct
53 Correct 141 ms 9116 KB Output is correct
54 Correct 85 ms 9148 KB Output is correct
55 Correct 72 ms 9052 KB Output is correct
56 Correct 151 ms 9156 KB Output is correct
57 Correct 95 ms 9204 KB Output is correct
58 Correct 82 ms 9052 KB Output is correct
59 Correct 177 ms 9048 KB Output is correct
60 Correct 110 ms 9048 KB Output is correct
61 Correct 102 ms 9052 KB Output is correct
62 Correct 199 ms 9052 KB Output is correct
63 Correct 303 ms 9052 KB Output is correct
64 Correct 374 ms 9236 KB Output is correct
65 Correct 324 ms 9048 KB Output is correct
66 Correct 307 ms 9052 KB Output is correct
67 Correct 302 ms 9052 KB Output is correct
68 Correct 293 ms 9052 KB Output is correct
69 Correct 306 ms 9268 KB Output is correct
70 Correct 315 ms 9052 KB Output is correct
71 Correct 312 ms 9308 KB Output is correct
72 Correct 284 ms 9052 KB Output is correct
73 Correct 244 ms 9564 KB Output is correct
74 Correct 250 ms 9560 KB Output is correct
75 Correct 273 ms 9564 KB Output is correct
76 Correct 263 ms 9560 KB Output is correct
77 Correct 257 ms 9560 KB Output is correct
78 Correct 266 ms 9512 KB Output is correct
79 Correct 244 ms 9516 KB Output is correct
80 Correct 247 ms 9552 KB Output is correct
81 Correct 257 ms 9304 KB Output is correct
82 Correct 246 ms 9304 KB Output is correct
83 Correct 269 ms 9304 KB Output is correct
84 Correct 260 ms 9304 KB Output is correct
85 Correct 272 ms 9352 KB Output is correct
86 Correct 259 ms 9308 KB Output is correct
87 Correct 258 ms 9468 KB Output is correct
88 Correct 261 ms 9308 KB Output is correct
89 Correct 264 ms 9308 KB Output is correct
90 Correct 274 ms 9304 KB Output is correct
91 Correct 268 ms 9564 KB Output is correct
92 Correct 272 ms 9412 KB Output is correct