In a 2 dimensional array grid, each value grid[i][j] represents the height of a building located there. We are allowed to increase the height of any number of buildings, by any amoun...
let bjdata = [ [{name:'北京'}, {name:'上海',value:95}], [{name:'北京'}, {name:'广州',value:90}]];
let convert = (data) => { let res = []; for (var i = 0; i < data.length; i++) { ...