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refactor 598
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src/main/java/com/fishercoder/solutions/_598.java

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package com.fishercoder.solutions;
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/**
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* 598. Range Addition II
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Given an m * n matrix m initialized with all 0's and several update operations.
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Operations are represented by a 2D array,
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and each operation is represented by an array with two positive integers a and b,
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which means m[i][j] should be added by one for all 0 <= i < a and 0 <= j < b.
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You need to count and return the number of maximum integers in the matrix after performing all the operations.
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Example 1:
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Input:
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m = 3, n = 3
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operations = [[2,2],[3,3]]
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Output: 4
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Explanation:
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Initially, m =
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[[0, 0, 0],
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[0, 0, 0],
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[0, 0, 0]]
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After performing [2,2], m =
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[[1, 1, 0],
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[1, 1, 0],
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[0, 0, 0]]
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After performing [3,3], m =
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[[2, 2, 1],
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[2, 2, 1],
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[1, 1, 1]]
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So the maximum integer in m is 2, and there are four of it in m. So return 4.
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Note:
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The range of m and n is [1,40000].
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The range of a is [1,m], and the range of b is [1,n].
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The range of operations size won't exceed 10,000.
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*/
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public class _598 {
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public static class Solution1 {

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