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public static int sockMerchant(int n, List<Integer> ar) {
int[] count = new int[101];
int pairs = 0;
for(int i = 0; i < ar.size(); i++) {
count[ar.get(i)]++;
}
for(int i = 1; i < 101; i++) {
pairs += count[i]/2;
}
return pairs;
}****
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