g0501_0600.s0554_brick_wall.Solution Maven / Gradle / Ivy

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Java-based LeetCode algorithm problem solutions, regularly updated

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package g0501_0600.s0554_brick_wall;

// #Medium #Array #Hash_Table #2022_03_20_Time_13_ms_(75.64%)_Space_56.2_MB_(5.86%)

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Solution {
    public int leastBricks(List> wall) {
        Map map = new HashMap<>();
        for (List row : wall) {
            int sum = 0;
            for (int i = 0; i < row.size() - 1; i++) {
                sum += row.get(i);
                if (map.containsKey(sum)) {
                    map.put(sum, map.get(sum) + 1);
                } else {
                    map.put(sum, 1);
                }
            }
        }
        int result = wall.size();
        for (Map.Entry entry : map.entrySet()) {
            result = Math.min(result, wall.size() - entry.getValue());
        }
        return result;
    }
}