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2 years ago
package class27;
import java.util.HashMap;
public class Problem_0001_TwoSum {
public static int[] twoSum(int[] nums, int target) {
// key 某个之前的数 value 这个数出现的位置
HashMap<Integer, Integer> map = new HashMap<>();
for (int i = 0; i < nums.length; i++) {
if (map.containsKey(target - nums[i])) {
return new int[] { map.get(target - nums[i]), i };
}
map.put(nums[i], i);
}
return new int[] { -1, -1 };
}
}