示例:
输入:mat = [[1,2,3,4,5],[2,4,5,8,10],[3,5,7,9,11],[1,3,5,7,9]]
输出:5
提示:
1 <= mat.length, mat[i].length...<= 500
1 <= mat[i][j] <= 10^4
mat[i] 已按递增顺序排列。...2....= mat.size(), n = mat[0].size(), i = 0, cur = mat[0][0], count = 1;
vector idx(m,0);//每行遍历到的位置...while(1)
{
i = (i+1)%m;//循环遍历每行
while(idx[i] < n && mat[i][idx[i]]