题解 | #尼科彻斯定理#
尼科彻斯定理
https://www.nowcoder.com/practice/dbace3a5b3c4480e86ee3277f3fe1e85
<?php
$num = trim(fgets(STDIN));
$mid = $num*$num;
$min = $mid-$num+1;
$max = $mid+$num-1;
for($i=$min;$i<=$max;$i++) {
if($i%2 !== 0) {
$arr[] = $i;
}
}
echo implode("+",$arr);
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