Leetcode #48

gistfile1.txt

public void rotate(int[][] matrix) {
        int len = matrix.length;
        int start, end, element;
        for(int layer=0; layer<len/2;layer++){
            start = layer;
            end = len-1-start;
            for(int gp=0; gp<end-start;gp++){
                element = matrix[layer][start+gp];
                matrix[layer][start+gp] = matrix[end-gp][layer];
                matrix[end-gp][layer] = matrix[len-1-layer][end-gp];
                matrix[len-1-layer][end-gp] = matrix[start+gp][len-1-layer];
                matrix[start+gp][len-1-layer] = element;
            }
        }
    }