题解 | #找出字符串中第一个只出现一次的字符#
找出字符串中第一个只出现一次的字符
https://www.nowcoder.com/practice/e896d0f82f1246a3aa7b232ce38029d4
function getOnceChar(str) {
const strArr = str.split('');
let left = '';
let right = '';
for (let i = 0, len = strArr.length; i < len; i++) {
if (i === 0) {
left = '';
right = str.substring(1);
} else if (i === strArr.length - 1) {
right = '';
left = str.substring(0, strArr.length - 1);
} else {
left = str.substring(0, i);
right = str.substring(i + 1);
}
if (left.indexOf(strArr[i]) === -1 && right.indexOf(strArr[i]) === -1) {
return strArr[i];
}
}
return -1;
}
while(line = readline()) {
print(getOnceChar(line));
}
