oj.uz

Submission #474110

# Submission time Handle Problem Language Result Execution time Memory
474110 2021-09-16T22:52:17 Z CaroLinda Selotejp (COCI20_selotejp) C++14
110 / 110
 373 ms 2536 KB 
#include <bits/stdc++.h>

#define sz(x) (int)(x.size())
#define debug printf
#define lp(i,a,b) for(int i = a ; i < b; i++)
#define pb push_back
#define ff first
#define ss second
#define mk make_pair
#define pii pair<int,int>
#define ll long long 
#define all(x) x.begin(),x.end()
 
const int MAXN = 1010 ;
const int MAX = 1e4+10 ;
 
using namespace std ;

int N , M , toGet, toFill = 1 , inf ;
int dp[2][(1<<11)] ;
char grid[MAXN][12] ;
vector<int> freq[MAX+100] ;

bool isOn(int m, int i ) { return ((1<<i)&m) != 0 ; }

void dijkstra(int l)
{
	
	for(int i = 0 ; i < MAX ; i++ )
		while( !freq[i].empty() )
		{
			int e = freq[i][0] ;
			
			if( dp[toFill][e] < i ) 
			{
				freq[i][0] = freq[i].back() ;
				freq[i].pop_back() ;
				continue ;
			}
			
			vector<pair<int,int> > neigh ;
						
			for(int g = 0 ; g < M ; g++ )
			{
				
				if(grid[l][g] == '#')
					neigh.push_back( make_pair(e^(1<<g) , i+!isOn(e,g) ) ) ;

			}	
			
			for(auto viz : neigh )
			{
				if(viz.first == 1 && l == 0 && viz.second == 1 ) cout << "----- " << e << endl ;
				if( dp[toFill][viz.first] <= viz.second ) continue ;
				freq[ dp[toFill][viz.first] = viz.second ].push_back(viz.first) ;
			}	
			
			swap(freq[i][0] , freq[i].back()) ;
			freq[i].pop_back() ;
		}
	
}

int main()
{
	scanf("%d %d", &N, &M ) ;
	for(int i = 0 ; i < N ; i++ )
		for(int j = 0 ; j < M ; j++ ) scanf(" %c", &grid[i][j] ) ;
		
	inf = (N*M)+2 ; 
	for(int i = 1 ; i < (1<<M) ; i++ ) dp[0][i] = __builtin_popcount(i) ;
	
	for(int i = 0 ; i < N ; i++, swap(toGet, toFill) ) 
	{
		for(int j = 0 ; j < (1<<M) ; j++ )
		{			
			int t = 0 , m = j ;
			dp[toFill][j] = inf ;
			
			bool ok = false ;
			
			for(int g = 0 ; g < M ; g++ )
			{
				if( !isOn(j,g) ) continue ;
				if( grid[i][g] == '.' ) ok = true ;
				if(i-1 >= 0 && grid[i-1][g] == '.')
				{
					t++ ;
					m^=(1<<g) ;
				}
			}	
			
			if(ok ) continue ;
			
			int qtd = 0 , isGoing = -1 ;
			for(int g = 0 ;g < M ; g++ )
			{
				if( isOn(j,g) ) 
				{
					isGoing = -1 ;
					continue ;
				}
				
				if( grid[i][g] == '.' ) isGoing = -1 ;
				else 
				{
					if(isGoing == -1 ) qtd++ ;
					isGoing = 1 ;
				}
				
			}
			
			dp[toFill][j] = min(inf,qtd+dp[toGet][m]+t) ;
				
		}
		
			
		for(int j = 0 ; j <= N*M+10 ; j++ ) freq[j].clear() ;	
		for(int j = 0 ; j < (1<<M) ; j++ ) freq[ dp[toFill][j] ].push_back(j) ; 

		dijkstra(i) ;


	}
	
	int ans = *min_element(dp[toGet] , dp[toGet]+(1<<M)) ;
	printf("%d\n" , ans ) ;
	
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:67:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |  scanf("%d %d", &N, &M ) ;
      |  ~~~~~^~~~~~~~~~~~~~~~~~
Main.cpp:69:38: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |   for(int j = 0 ; j < M ; j++ ) scanf(" %c", &grid[i][j] ) ;
      |                                 ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 460 KB Output is correct
2 Correct 146 ms 600 KB Output is correct
3 Correct 78 ms 580 KB Output is correct
4 Correct 102 ms 576 KB Output is correct
5 Correct 197 ms 580 KB Output is correct
6 Correct 209 ms 668 KB Output is correct
7 Correct 203 ms 680 KB Output is correct
8 Correct 145 ms 696 KB Output is correct
9 Correct 205 ms 692 KB Output is correct
10 Correct 244 ms 1520 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 460 KB Output is correct
2 Correct 3 ms 460 KB Output is correct
3 Correct 2 ms 460 KB Output is correct
4 Correct 5 ms 460 KB Output is correct
5 Correct 2 ms 460 KB Output is correct
6 Correct 3 ms 460 KB Output is correct
7 Correct 2 ms 460 KB Output is correct
8 Correct 3 ms 460 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 460 KB Output is correct
2 Correct 146 ms 600 KB Output is correct
3 Correct 78 ms 580 KB Output is correct
4 Correct 102 ms 576 KB Output is correct
5 Correct 197 ms 580 KB Output is correct
6 Correct 209 ms 668 KB Output is correct
7 Correct 203 ms 680 KB Output is correct
8 Correct 145 ms 696 KB Output is correct
9 Correct 205 ms 692 KB Output is correct
10 Correct 244 ms 1520 KB Output is correct
11 Correct 3 ms 460 KB Output is correct
12 Correct 3 ms 460 KB Output is correct
13 Correct 2 ms 460 KB Output is correct
14 Correct 5 ms 460 KB Output is correct
15 Correct 2 ms 460 KB Output is correct
16 Correct 3 ms 460 KB Output is correct
17 Correct 2 ms 460 KB Output is correct
18 Correct 3 ms 460 KB Output is correct
19 Correct 37 ms 588 KB Output is correct
20 Correct 80 ms 700 KB Output is correct
21 Correct 134 ms 736 KB Output is correct
22 Correct 96 ms 460 KB Output is correct
23 Correct 135 ms 544 KB Output is correct
24 Correct 176 ms 728 KB Output is correct
25 Correct 242 ms 908 KB Output is correct
26 Correct 287 ms 2160 KB Output is correct
27 Correct 334 ms 2536 KB Output is correct
28 Correct 373 ms 884 KB Output is correct