Niz z največjim številom edinstvenih znakov
Glede na niz nizov je naloga natisniti niz z največje število edinstvenih likov.
Opomba:
- Nizi so sestavljeni iz malih črk.
- Če obstaja več nizov, natisnite katerega koli od njih.
Primeri:
Vnos: arr[] = ['abc' 'geeksforgeeks' 'gfg' 'code']
Izhod: "geeki za geeke"
Pojasnilo: 'abc' ima 3 edinstvene znake 'geeksforgeeks' ima 7 edinstvenih znakov
'gfg' ima 3 edinstvene znake 'code' ima 4 edinstvene znake.Vnos: arr[] = ['zdravo' 'svet' 'programiranje' 'zebra']
Izhod: 'programiranje'
Pojasnilo: 'programiranje' ima 8 edinstvenih znakov, kar je največ.
Pristop:
Ideja je sistematično preučiti vsak niz in slediti, katere male črke se v njem pojavijo, z uporabo logične matrike, ki šteje te edinstvene znake in spremljati, kateri niz je doslej dal največje število.
Pristop korak za korakom:
- Ponavljajte vsak niz v zbirki.
- Za vsak niz uporabite logično polje, da označite, katere črke so prisotne.
- Preštejte, koliko različnih črk je bilo označenih kot prisotne.
- Če to število preseže prejšnje največje število, posodobite največje število in si zapomnite položaj tega niza.
- Vrne niz z največjim številom najdenih edinstvenih znakov.
// C++ code to find string with maximum // number of unique characters. #include using namespace std ; // Function to find string with // maximum number of unique characters. string maxString ( vector < string > & arr ) { int n = arr . size (); int index = -1 maxCnt = 0 ; for ( int i = 0 ; i < n ; i ++ ) { vector < bool > map ( 26 false ); for ( int j = 0 ; j < arr [ i ]. length (); j ++ ) { map [ arr [ i ][ j ] - 'a' ] = true ; } // Find number of unique char int cnt = 0 ; for ( int j = 0 ; j < 26 ; j ++ ) { if ( map [ j ] == true ) cnt ++ ; } // If unique count is greater if ( cnt > maxCnt ) { maxCnt = cnt ; index = i ; } } return arr [ index ]; } int main () { vector < string > arr = { 'abc' 'geeksforgeeks' 'gfg' 'code' }; cout < < maxString ( arr ); return 0 ; }
Java // Java code to find string with maximum // number of unique characters. import java.util.* ; class GfG { // Function to find string with // maximum number of unique characters. static String maxString ( String [] arr ) { int n = arr . length ; int index = - 1 maxCnt = 0 ; for ( int i = 0 ; i < n ; i ++ ) { boolean [] map = new boolean [ 26 ] ; for ( int j = 0 ; j < arr [ i ] . length (); j ++ ) { map [ arr [ i ] . charAt ( j ) - 'a' ] = true ; } // Find number of unique char int cnt = 0 ; for ( int j = 0 ; j < 26 ; j ++ ) { if ( map [ j ] == true ) cnt ++ ; } // If unique count is greater if ( cnt > maxCnt ) { maxCnt = cnt ; index = i ; } } return arr [ index ] ; } public static void main ( String [] args ) { String [] arr = { 'abc' 'geeksforgeeks' 'gfg' 'code' }; System . out . println ( maxString ( arr )); } }
Python # Python code to find string with maximum # number of unique characters. # Function to find string with # maximum number of unique characters. def maxString ( arr ): n = len ( arr ) index = - 1 maxCnt = 0 for i in range ( n ): map = [ False ] * 26 for j in range ( len ( arr [ i ])): map [ ord ( arr [ i ][ j ]) - ord ( 'a' )] = True # Find number of unique char cnt = sum ( 1 for j in range ( 26 ) if map [ j ]) # If unique count is greater if cnt > maxCnt : maxCnt = cnt index = i return arr [ index ] if __name__ == '__main__' : arr = [ 'abc' 'geeksforgeeks' 'gfg' 'code' ] print ( maxString ( arr ))
C# // C# code to find string with maximum // number of unique characters. using System ; class GfG { // Function to find string with // maximum number of unique characters. static string maxString ( string [] arr ) { int n = arr . Length ; int index = - 1 maxCnt = 0 ; for ( int i = 0 ; i < n ; i ++ ) { bool [] map = new bool [ 26 ]; for ( int j = 0 ; j < arr [ i ]. Length ; j ++ ) { map [ arr [ i ][ j ] - 'a' ] = true ; } // Find number of unique char int cnt = 0 ; for ( int j = 0 ; j < 26 ; j ++ ) { if ( map [ j ] == true ) cnt ++ ; } // If unique count is greater if ( cnt > maxCnt ) { maxCnt = cnt ; index = i ; } } return arr [ index ]; } static void Main () { string [] arr = { 'abc' 'geeksforgeeks' 'gfg' 'code' }; Console . WriteLine ( maxString ( arr )); } }
JavaScript // JavaScript code to find string with maximum // number of unique characters. // Function to find string with // maximum number of unique characters. function maxString ( arr ) { let n = arr . length ; let index = - 1 maxCnt = 0 ; for ( let i = 0 ; i < n ; i ++ ) { let map = new Array ( 26 ). fill ( false ); for ( let j = 0 ; j < arr [ i ]. length ; j ++ ) { map [ arr [ i ]. charCodeAt ( j ) - 'a' . charCodeAt ( 0 )] = true ; } // Find number of unique char let cnt = 0 ; for ( let j = 0 ; j < 26 ; j ++ ) { if ( map [ j ] === true ) cnt ++ ; } // If unique count is greater if ( cnt > maxCnt ) { maxCnt = cnt ; index = i ; } } return arr [ index ]; } let arr = [ 'abc' 'geeksforgeeks' 'gfg' 'code' ]; console . log ( maxString ( arr ));
Izhod
geeksforgeeks
Časovna zapletenost: O(n*m) kjer n je velikost dane matrike nizov in m je največja velikost niza v dani matriki.
Pomožni prostor: O(1)
