英文:
Writing a function to rotate a 2d vector 90 degrees clockwise
问题
我试图将一个二维向量顺时针旋转，但无法使其适用于非正方形向量。这是我的尝试：
bool Pgm::Clockwise() {
int i, j, k;
vector<vector<int>> tempPixel;
for (i = 0; i < Pixels.size(); i++) {
tempPixel.push_back(Pixels.at(i));
}
for (j = 0; j < tempPixel.size(); j++) {
tempPixel.push_back(vector<int>());
for (k = 0; k < tempPixel.at(0).size(); k++) {
tempPixel.at(j).push_back(Pixels.at(j));
}
}
return true;
}
英文:
I am trying to rotate a 2d vector clockwise but I am unable to get it to work for vectors that are not square.
Here is what I tried
bool Pgm::Clockwise(){
int i, j, k;
vector <vector <int> > tempPixel;
for (i = 0; i < Pixels.size(); i++) {
tempPixel.push_back(Pixels.at(i));
}
for (j = 0; j < tempPixel.size(); j++) {
tempPixel.push_back(vector<int>());
for (k = 0; k < tempPixel.at(0).size(); k++) {
tempPixel.at(j).push_back(Pixels.at(j));
}
}
return true;
}
答案1
得分: 1
这个函数接受一个二维向量作为输入，并返回一个顺时针旋转90度的新二维向量。它首先创建一个具有交换维度的新向量rotated，然后通过按适当的顺序从输入向量复制元素来填充它。希望这能帮助您了解它的工作原理。
英文:
#include <vector>
std::vector<std::vector<int>> rotateClockwise(std::vector<std::vector<int>> v) {
int n = v.size();
int m = v[0].size();
// create new vector with swapped dimensions
std::vector<std::vector<int>> rotated(m, std::vector<int>(n));
// populate the new vector
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
rotated[j][n-i-1] = v[i][j];
}
}
return rotated;
}
This function takes a 2D vector as input and returns a new 2D vector that is rotated 90 degrees clockwise. It first creates a new vector rotated with dimensions swapped, then populates it by copying the elements from the input vector in the appropriate order.
i hope this will help you to get an idea..
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论