class Solution {
public:
int numPairsDivisibleBy60(vector<int>& time) {
int ans = 0;
map<int,int> mp;
for(auto x:time){
int mod = x%60;
if(mp.count((60 - mod)%60) > 0){
ans += mp[(60 -mod)%60];
}
mp[mod]++;
}
return ans;
}
};
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