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65.java
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65.java
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__________________________________________________________________________________________________
sample 1 ms submission
class Solution {
// NOTE: 05 is valid
public boolean isNumber(String s) {
if (s == null || s.length() == 0) {
return false;
}
s = s.trim();
char[] ss = s.toCharArray();
boolean pointSeen = false;
boolean eSeen = false;
boolean numberAfterE = true;
boolean numberSeen = false;
for (int i = 0; i < ss.length; i++) {
if (ss[i] >= '0' && ss[i] <= '9') {
numberSeen = true;
numberAfterE = true;
} else if (ss[i] == '.') {
if (pointSeen || eSeen /* number after e must be integer*/) {
return false;
}
pointSeen = true;
} else if (ss[i] == 'e') {
if (eSeen || !numberSeen) {
return false;
}
numberAfterE = false;
eSeen = true;
} else if (ss[i] == '+' || ss[i] == '-') {
// sign can only appear at index 0 or after e
if (i != 0 && ss[i - 1] != 'e') {
return false;
}
} else {
return false;
}
}
return numberSeen && numberAfterE;
}
}
__________________________________________________________________________________________________
sample 35572 kb submission
class Solution {
public boolean isNumber(String s) {
if (s == null || s.length() == 0) return false;
s = s.trim();
boolean numSeen = false;
boolean dotSeen = false;
boolean eSeen = false;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (Character.isDigit(c)) {
numSeen = true;
} else if (c == 'e') {
if (!numSeen || eSeen) return false;
eSeen = true;
numSeen = false;
} else if (c == '.') {
if (eSeen || dotSeen) return false;
dotSeen = true;
} else if (c == '-' || c == '+') {
if (i != 0 && s.charAt(i - 1) != 'e') return false;
} else return false;
}
return numSeen;
}
}
__________________________________________________________________________________________________