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Problem151.java

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class Problem151 {

public static void main(String[] args) {

String s = "easy it hello";

System.out.println("-" + new Problem151().reverseWords(s) + "-");

}

public String reverseWords(String s) {

int i = 0, j = s.length()-1;

char[] sarr = s.toCharArray();

while (i < j) {

char c = sarr[i];

sarr[i] = sarr[j];

sarr[j] = c;

i++;

j--;

}// reverse

// reverse word

// cba 331

int k = 0;

int start = 0;

while( k < sarr.length) {

if (sarr[k] == ' ' || k == sarr.length-1) {

// reverse

if (start < k) {

int end = sarr[k] == ' ' ? k-1: k;

while(start < end) {

char c = sarr[start];

sarr[start] = sarr[end];

sarr[end] = c;

start++;

end--;

}

start = ++k;

} else {

k++;

}

} else {

k++;

}

}

System.out.println("-" + new String(sarr) + "-");

int m = 0;

char pre = '\0';

for (int l = 0; l < sarr.length; l++) {

if (sarr[l] == ' ') {

if (pre != ' ' && l != sarr.length-1) {

sarr[m] = sarr[l];

m++;

}

} else {

sarr[m] = sarr[l];

m++;

}

pre = sarr[l];

}

return new String(sarr, 0, m).trim();

}

}