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Problem 8 - Project Euler in Java by Jane Ullah
/**
* @author Jane Ullah
* @purpose Problem 8 - Project Euler
* @date 12/28/2011
* @site http://janetalkscode.com
*/
public class Problem8 {
public static void main(String[] args) {
String digits = "73167176531330624919225119674426574742355349194934"
+ "96983520312774506326239578318016984801869478851843"
+ "85861560789112949495459501737958331952853208805511"
+ "12540698747158523863050715693290963295227443043557"
+ "66896648950445244523161731856403098711121722383113"
+ "62229893423380308135336276614282806444486645238749"
+ "30358907296290491560440772390713810515859307960866"
+ "70172427121883998797908792274921901699720888093776"
+ "65727333001053367881220235421809751254540594752243"
+ "52584907711670556013604839586446706324415722155397"
+ "53697817977846174064955149290862569321978468622482"
+ "83972241375657056057490261407972968652414535100474"
+ "82166370484403199890008895243450658541227588666881"
+ "16427171479924442928230863465674813919123162824586"
+ "17866458359124566529476545682848912883142607690042"
+ "24219022671055626321111109370544217506941658960408"
+ "07198403850962455444362981230987879927244284909188"
+ "84580156166097919133875499200524063689912560717606"
+ "05886116467109405077541002256983155200055935729725"
+ "71636269561882670428252483600823257530420752963450";
int maxProduct = 0, temp = 1;
for (int i = 0; i < (digits.length()-5); i++) {
String fiveDigits = digits.substring(i,(i+5));
temp = parseString(fiveDigits);
if (temp > maxProduct) {
maxProduct = temp;
}
}
System.out.println("Max product: " + maxProduct);
}
//Method to multiply all 'digits' in a string
public static int parseString(String digits) {
int product = 0;
//Strips out non-word characters
digits = digits.replaceAll("\\W","");
for (int i = 0; i < digits.length(); i++){
product *= Integer.parseInt(digits.substring(i,(i+1)));
}
return (digits.length() > 0) ? product:0;
}
}
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