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public class JumpGameII {

/**

* 动态规划

*/

public int jump(int[] nums) {

int[] steps = new int[nums.length];

for (int i = 0; i < nums.length; i++) {

steps[i] = i;

}

for (int i = 1; i < nums.length; i++) {

for (int j = 0; j < i; j++) {

if (j + nums[j] >= i) {

steps[i] = Math.min(steps[i], steps[j] + 1);

}

}

}

return steps[nums.length - 1];

}

/**

* longestJump表示jumps步最远能到的距离

* maxJump表示以[0,i]为起点能覆盖到的最远距离

*/

public int jump2(int[] nums) {

int longestJump = 0, maxJump = 0, jumps = 0;

for (int i = 0; i < nums.length; i++) {

// 表示i-1时还覆盖得到，而i覆盖不到了，所以更新为[0,i-1]时的maxJump

if (longestJump < i) {

longestJump = maxJump;

jumps++;

}

maxJump = Math.max(maxJump, nums[i] + i);

}

return jumps;

}

}