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Merge pull request #663 from SunggyuLee/sung9

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one new Dynamic Programming Algorithm and a modification adding recommanding input method
This commit is contained in:
Libin Yang
2018-12-19 22:34:24 +08:00
committed by GitHub
parent 8a18020f50 42bed57195
commit db7c1002c3
2 changed files with 78 additions and 4 deletions
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71
Dynamic Programming/Ford_Fulkerson.java Normal file
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@ -0,0 +1,71 @@
import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;
import java.util.Vector;
public class Ford_Fulkerson {
Scanner scan = new Scanner(System.in);
final static int INF = 987654321;
static int V; // edges
static int[][] capacity, flow;
public static void main(String[] args) {
System.out.println("V : 6");
V = 6;
capacity = new int[V][V];
capacity[0][1] = 12;
capacity[0][3] = 13;
capacity[1][2] = 10;
capacity[2][3] = 13;
capacity[2][4] = 3;
capacity[2][5] = 15;
capacity[3][2] = 7;
capacity[3][4] = 15;
capacity[4][5] = 17;
System.out.println("Max capacity in networkFlow : " + networkFlow(0, 5));
}
private static int networkFlow(int source, int sink) {
flow = new int[V][V];
int totalFlow = 0;
while (true) {
Vector<Integer> parent = new Vector<>(V);
for (int i = 0; i < V; i++)
parent.add(-1);
Queue<Integer> q = new LinkedList<>();
parent.set(source, source);
q.add(source);
while (!q.isEmpty() && parent.get(sink) == -1) {
int here = q.peek();
q.poll();
for (int there = 0; there < V; ++there)
if (capacity[here][there] - flow[here][there] > 0 && parent.get(there) == -1) {
q.add(there);
parent.set(there, here);
}
}
if (parent.get(sink) == -1)
break;
int amount = INF;
String printer = "path : ";
StringBuilder sb = new StringBuilder();
for (int p = sink; p != source; p = parent.get(p)) {
amount = Math.min(capacity[parent.get(p)][p] - flow[parent.get(p)][p], amount);
sb.append(p + "-");
}
sb.append(source);
for (int p = sink; p != source; p = parent.get(p)) {
flow[parent.get(p)][p] += amount;
flow[p][parent.get(p)] -= amount;
}
totalFlow += amount;
printer += sb.reverse() + " / max flow : " + totalFlow;
System.out.println(printer);
}
return totalFlow;
}
}

11
Others/Armstrong.java
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@ -9,10 +9,10 @@ import java.util.Scanner;
*
*/
public class Armstrong {
static Scanner scan;
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("please enter the number");
int n = scan.nextInt();
scan = new Scanner(System.in);
int n = inputInt("please enter the number");
boolean isArmstrong = checkIfANumberIsAmstrongOrNot(n);
if (isArmstrong) {
System.out.println("the number is armstrong");
@ -42,6 +42,9 @@ public class Armstrong {
} else {
return false;
}
}
private static int inputInt(String string) {
System.out.print(string);
return Integer.parseInt(scan.nextLine());
}
}