Tugas Analisis Algoritma
RIDHO RONALDI EKA PUTRA | 1517051151 email: [email protected]
PROGRAM STUDI S1 ILMU KOMPUTER
JURUSAN ILMU KOMPUTER
Universitas Lampung, Jln. Prof. Dr. Sumantri Brojonegoro No. 1 35145, Indonesia
Question
Algoritma 1 /*
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* and open the template in the editor. */
package analog;
/** *
* @author ridhoronaldi */
public class Alg1 { long start; long end;
int max_subsequence_sum( int a[],int n ) { start = System.currentTimeMillis();
int this_sum, max_sum, best_i, best_j, i, j, k; max_sum = 0; best_i = best_j = -1;
for( i=0; i<n; i++ ) for( j=i; j<n; j++ ) { this_sum=0;
for( k = i; k<=j; k++ ) this_sum += a[k];
if( this_sum > max_sum ) { /* update max_sum, best_i, best_j */
max_sum = this_sum; best_i = i;
best_j = j; }
end = System.currentTimeMillis(); return( max_sum );
}
long resultTime(){ return (end - start); }
}
Algoritma 2 /*
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* and open the template in the editor. */
package analog;
/** *
* @author ridhoronaldi */
public class Alg2 { long end;
long start;
int max_subsequence_sum( int a[],int n ) {
start = System.currentTimeMillis();
int this_sum, max_sum, best_i, best_j, i, j, k;
max_sum = 0; best_i = best_j = -1; for( i=0; i<n; i++ ) {
this_sum = 0; for( j=i; j<n; j++ ){ this_sum += a[j];
if( this_sum > max_sum ){ max_sum = this_sum; best_i = i;
best_j = j; }
} }
end = System.currentTimeMillis(); return( max_sum );
long resultTime(){ return (end - start); }
}
Algoritma 3 /*
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* and open the template in the editor. */
package analog;
/** *
* @author ridhoronaldi */
public class Alg3 { long end;
long start;
int max_sub_sequence_sum( int a[], int n ) {
return max_sub_sum( a, 0, n-1 ); }
int max_sub_sum( int a[], int left, int right ) { start = System.currentTimeMillis();
int max_left_sum, max_right_sum;
int max_left_border_sum, max_right_border_sum; int left_border_sum, right_border_sum;
int center, i;
if ( left == right ) if( a[left] > 0 ) return a[left]; else
return 0;
center = (left + right )/2;
max_left_sum = max_sub_sum( a, left, center ); max_right_sum = max_sub_sum( a, center+1, right ); max_left_border_sum = 0; left_border_sum = 0;
for( i=center; i>=left; i-- ) { left_border_sum += a[i];
max_left_border_sum = left_border_sum; }
max_right_border_sum = 0; right_border_sum = 0;
for( i=center+1; i<=right; i++ ){ right_border_sum += a[i];
if( right_border_sum > max_right_border_sum ) max_right_border_sum = right_border_sum; }
end = System.currentTimeMillis();
return max3( max_left_sum, max_right_sum,max_left_border_sum + max_right_border_sum );
}
int max3(int nilai1, int nilai2, int nilai3){ if (nilai1 > nilai2 && nilai1 > nilai3){ return nilai1;
}
else if(nilai2 > nilai1 && nilai2 > nilai3){ return nilai2;
} else{
return nilai3; }
}
long resultTime(){ return (end - start); }
}
Algoritma 4 /*
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* and open the template in the editor. */
package analog;
/** *
* @author dimsronaldi */
long end; long start;
int max_subsequence_sum( int a[], int n ) { start = System.currentTimeMillis(); int this_sum, max_sum, best_i, best_j, i, j; i = this_sum = max_sum = 0;
best_i = best_j = -1;
for( j=0; j<n; j++ ) { this_sum += a[j];
if( this_sum > max_sum ) { max_sum = this_sum; best_i = i;
best_j = j; }
else if( this_sum < 0 ){ i = j + 1;
this_sum = 0; }
}
end = System.currentTimeMillis(); return( max_sum );
}
long resultTime(){ return (end - start); }
}
Main algoritma /*
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* and open the template in the editor. */
package analog;
import java.util.Random; /**
*
* @author ridhoronaldi */
/**
* @param args the command line arguments */
public static void main(String[] args) { // TODO code application logic here Random rdm = new Random();
Alg1 alg1 = new Alg1(); Alg2 alg2 = new Alg2(); Alg3 alg3 = new Alg3(); Alg4 alg4 = new Alg4();
// 1. ketika n = 10 int data[];
int n=0;
for(int i = 0; i < 7; i++){ switch (i) {
case 0: n = 10; break; case 1: n = 100; break; case 2: n = 500; break; case 3: n = 1000; break; case 4: n = 5000; break; case 5: n = 10000; break; case 6:
n = 100000; break; default: break; }
data = new int[n];
data[j] = rdm.nextInt(101); }
System.out.println("Ketika n = "+n+"\n"); /*
System.out.println("Algoritma 1 ");
System.out.println("Hasil = "+alg1.max_subsequence_sum(data, data.length)); System.out.println("Time = "+alg1.resultTime() + " ms");
*/
System.out.println("Algoritma 2 ");
System.out.println("Hasil = "+alg2.max_subsequence_sum(data, data.length)); System.out.println("Time = "+alg2.resultTime() + " ms");
System.out.println("Algoritma 3 ");
System.out.println("Hasil = "+alg3.max_sub_sequence_sum(data, data.length)); System.out.println("Time = "+alg3.resultTime() + " ms");
System.out.println("Algoritma 4 ");
System.out.println("Hasil = "+alg4.max_subsequence_sum(data, data.length)); System.out.println("Time = "+alg4.resultTime() + " ms\n");
} } }
N Algoritma 1 Algoritma 2 Algoritma 3 Algoritma4
10 0 0 0 0
100 9 0 1 0
500 89 11 0 0
1000 249 12 0 0
5000 25512 17 1 0
10000 155338 48 0 1
