第 54 场双周赛

src/main/java/com/code/leet/doubleWeek/SolutionD54.java

@@ -0,0 +1,106 @@
+package com.code.leet.doubleWeek;
+
+public class SolutionD54 {
+    public static void main(String[] args) {
+        SolutionD54 solution = new SolutionD54();
+//        System.out.println(solution.isCovered(new int[][]{{1, 2}, {3, 4}, {5, 6}}, 2, 5));
+//        System.out.println(solution.chalkReplacer(new int[]{3, 4, 1, 2}, 25));
+        System.out.println(solution.largestMagicSquare(new int[][]{{7, 1, 4, 5, 6}, {2, 5, 1, 6, 4}, {1, 5, 4, 3, 2}, {1, 2, 7, 3, 4}}));
+//        System.out.println(solution.largestMagicSquare(new int[][]{{8,1,6}, {3,5,7}, {4,9,2}, {7,10,9}}));
+    }
+
+    public boolean isCovered(int[][] ranges, int left, int right) {
+        for (int i = left; i <= right; i++) {
+            boolean is = true;
+            for (int[] range : ranges) {
+                if (range[0] <= i && range[1] >= i) {
+                    if (range[1] >= right) {
+                        return true;
+                    }
+                    i = range[1];
+                    is = false;
+                    break;
+                }
+            }
+            if (is) {
+                return false;
+            }
+        }
+        return false;
+    }
+
+    public int chalkReplacer(int[] chalk, int k) {
+        int temp = k;
+        int length = chalk.length;
+        int[] free = new int[length];
+        for (int i = 0; i < length; i++) {
+            if (i == 0) {
+                free[i] = chalk[i];
+            } else {
+                free[i] += chalk[i] + free[i - 1];
+            }
+            temp -= chalk[i];
+            if (temp < 0) {
+                return i;
+            }
+        }
+        temp %= free[length - 1];
+        if (temp == 0) {
+            return 0;
+        }
+        for (int i = 0; i < length; i++) {
+            temp -= chalk[i];
+            if (temp < 0) {
+                return i;
+            }
+        }
+        return 0;
+    }
+
+    public int largestMagicSquare(int[][] grid) {
+        int x = grid.length;
+        int y = grid[0].length;
+        int[][] xArr = new int[x][y + 1];
+        for (int i = 0; i < x; i++) {
+            for (int j = 0; j < y; j++) {
+                xArr[i][j + 1] = xArr[i][j] + grid[i][j];
+            }
+        }
+        int result = 1;
+        //下面的前2层for是y的范围
+        for (int i = 0; i <= y; i++) {
+            for (int j = y; j > i + result; j--) {
+                int sum = xArr[0][j] - xArr[0][i];
+                int count = j - i;
+                int temp = 1;
+                int index = 0;
+                //k
+                for (int k = 1; k < x; k++) {
+                    if (xArr[k][j] - xArr[k][i] == sum) {
+                        temp++;
+                    } else {
+                        sum = xArr[k][j] - xArr[k][i];
+                        temp = 1;
+                        index = k;
+                    }
+                    if (temp == count) {
+                        int x1 = 0;
+                        int x2 = 0;
+                        int m = 0;
+                        for (int l = i; l < j; l++) {
+                            x1 += grid[index + m][l];
+                            x2 += grid[k - m][l];
+                        }
+                        if (sum == x1 && sum == x2) {
+                            result = Math.max(result, count);
+                            break;
+                        }
+                        index++;
+                        temp--;
+                    }
+                }
+            }
+        }
+        return result;
+    }
+}