Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). Range Sum Query 2D The above rectangle (with the red border) is defined by (row1, col1)= (2, 1) and (row2, col2)...
/*** @param {number[][]} matrix*/varNumMatrix=function(matrix){this.rowsAccumulate=[];letrows=matrix.length;if(rows===0){return;}letcols=matrix[0].length;for(leti=0;i<rows;i++){letrow=[0];letsum=0;for(letj=0;j<cols;j++){sum+=matrix[i][j];row.push(sum);}this.rowsAccum...
Range Sum Query 2D - Immutable Range Sum Query - Mutable Range Sum Query - Immutable 参考资料: https://leetcode.com/problems/range-sum-query-2d-mutable/ https://leetcode.com/problems/range-sum-query-2d-mutable/discuss/75852/15ms-easy-to-understand-java-solution https://leetcode.com/problem...
Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). Range Sum Query 2D The above rectangle (with the red border) is defined by (row1, col1) = (2, 1) and (row2, col2...
Range Sum Query 2D - Immutable 思路:思想和303差不多。变为一个2D的表格。每个格子是从(0,0)到(i,j)矩形内所有格子之和。动态规划,每...
https://leetcode.com/problems/range-sum-query-2d-immutable/ 简单DP就行。 构造辅助二维数组sums sums[x][y]表示从0,0到x,y的子矩阵的和 利用容斥原理,可知: sumRange(row1, col1, row2, col2) = sums[row2][col2] + sums[row1 - 1][col1 - 1] - sums[row1 - 1][col2] - sums[ro...
题目地址:https://leetcode.com/problems/range-sum-query-2d-immutable/description/ 题目描述 Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). ...
2 建立一个累积区域和的数组,从(r1, c1)到(r2, c2)区域的和为dp[r2][c2]-dp[r2][c1-1]-dp[r1-1][c2]+dp[r1-1][c1-1] 3 使用动态规划的时候,需要先initialize一个和原始matrix一样大小的matrix,其中每一个元素的值为0 4在init函数里,需要把每一个累积和求出来,这样在sumRegion函数里,就只需...
template<typenameT,int64_t...Ns>structFenwickTreeRURQ{T t=0;voidincrement(T x){t+=x;}T rangeSum(){returnt;}};template<typenameT,int64_tN,int64_t...Ns>structFenwickTreeRURQ<T,N,Ns...>{FenwickTreeRURQ<T,Ns...>t[2][N];template<typename...Args>voidsuffixIncrement(T x,int64_...
We study the problem of pre-computing auxillary information to support on-line range queries for the sum and max functions on a datacube. For a d-dimension... VDB Jan,V Vianu 被引量: 0发表: 2001年 Range-Max/Min Query in OLAP Data Cube A range query applies an aggregation operation ov...