message: Update longest-well-performing-interval.cpp
diff: @@ -12,7 +12,7 @@ public:
  result = i + 1;
  } else if (lookup.count(accu - 1)) {
  // lookup[accu-1] is the leftmost idx with smaller accu,
  - // because from 1 to some positive k,
  + // because for i from 1 to some positive k,
  // lookup[accu-i] is a strickly increasing sequence
  result = max(result, i - lookup[accu - 1]);
  }
  