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public class Main {
public static boolean matchPattern(String str,String pattern){
int patternLength = pattern.length();
int patternSum = 0;
int[] patternSumArray = new int[(str.length() - patternLength)+1];
int patternSumArrayIndex = 0;
int patternSumToCheck = 0;
String toCompare = "";
int backIndex = 0;
int forthIndex = pattern.length();
for(int i=0; i<pattern.length();i++){
patternSumToCheck = patternSumToCheck + pattern.charAt(i);
patternSum = patternSum + str.charAt(i);
}
patternSumArray[patternSumArrayIndex] = patternSum;
patternSumArrayIndex++;
for(int i=0; forthIndex<str.length();i++){
patternSum = patternSum + str.charAt(forthIndex) - str.charAt(backIndex);
forthIndex++;
backIndex++;
patternSumArray[patternSumArrayIndex] = patternSum;
patternSumArrayIndex++;
}
for(int i=0; i<patternSumArray.length;i++){
if(patternSumArray[i] == patternSumToCheck){
toCompare = "";
for(int j=i; j<(i+pattern.length());j++){
toCompare = toCompare + str.charAt(j);
}
if(toCompare.equals(pattern)){
return true;
}
}
}
return false;
}
public static void main(String[] args) {
String str = "cdxabie";
String pattern = "bie";
System.out.println(matchPattern(str, pattern));
}
}
