Create 1013-pairs-of-songs-with-total-durations-divisible-by-60.js

Author: everthis

1013-pairs-of-songs-with-total-durations-divisible-by-60.js

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+/**
+ * @param {number[]} time
+ * @return {number}
+ */
+const numPairsDivisibleBy60 = function(time) {
+  const count = new Map();
+  let n = 0;
+  for (let t of time) {
+    // two sum like method
+    let d = (60 - t % 60) % 60;
+    if (count.has(d)) { n += count.get(d); }
+    count.set(t % 60, 1 + (count.get(t % 60) || 0));
+  }
+  return n;
+};