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Reshape the Matrix

#程式碼

想法一:在二維陣列中,他的地址是有序、處於同一個記憶體空間的,{{1,2},{3,4}},在地址中表示相當與{1,2,3,4}。原想以這種方式來解決vector的重塑矩陣問題。

但是在vector中,每一個新的vector都會動態的分配一個空間,所以前一個vector和後一個vector不可能會在一個記憶體空間中。想法1宣告失敗。只能將vector中的值賦予陣列中,再進行操作。

        //基於想法一的實現
        vector<vector<int>> matrixReshape(vector<vector<int>>
&nums, int r, int c) { //判斷是否相等,否返回nums const int row = nums.size(); const int count = (*nums.begin()).size(); if ((r * c) != (row * count)) return nums; cout<<row<<count; int numArray[row][count]; int *p=&numArray[0
][0]; //將vector中的資料填充到陣列中 for (auto it = nums.begin(); it != nums.end(); it++) { for (auto iter = (*it).begin(); iter != (*it).end(); iter++) { *p=*iter; p++; } } //將陣列中的資料反填到新的vector中 vector<vector<int
>
>
numsRow{}; int *z=&numArray[0][0]; for (int i=0;i<r;i++) { vector<int> numsCout(z,z+c); numsRow.push_back(numsCout); z+=c; } return numsRow; }

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