static int findMissingNumber(int start, int end, List<Integer> list) {
int sum = 0;
for(Integer n : list){
sum += n;
}
return (start + end) * (end -start +1)/2 - sum;
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Andylbc
static int findMissingNumber(int start, int end, List<Integer> list) {
int sum = 0;
for(Integer n : list){
sum += n;
}
return (start + end) * (end -start +1)/2 - sum;
}