2678. Number of Senior Citizens

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class Solution {
public int countSeniors(String[] details) {
int count = 0;
for (String detail : details) {
int age = (detail.charAt(11) - '0') * 10 + (detail.charAt(12) - '0');
if (age > 60) {
count++;
}
}
return count;
}
}

References

2678. Number of Senior Citizens