Problem P29. [算法课贪心] 跳跃游戏 有一个非负整数数组 � � � � nums ,最初位于数组的第一个位置。 数组中的每个元素代表你在该位置可以跳跃的最大长度。 假设你总是可以到达数组的最后一个位置, 你的目标是使用最少的跳跃次数到达数组的最后一个位置。 输入 第一行输入一个整数 � ( 1 ≤ � ≤ 1 0 0 0 0 ) n (1≤n≤10000) 代表数组的长度。 第二行输入一行数字代表数组 � � � � ( 0 ≤ � � � � � ≤ 1 0 0 0 ) nums (0≤nums i ≤1000),数字与数字之间用空格间开。 输出 输出最少跳跃次数。
时间: 2024-03-18 13:44:53 浏览: 27
这是一道经典的贪心算法问题,可以使用贪心算法求解。
我们可以从左往右扫描数组,对于每个位置,我们都记录下当前能够到达的最远距离,即当前位置加上当前位置能够跳跃的最大长度。同时,我们还需要记录下最少需要跳跃的次数,初始值为 1。
接下来,我们需要考虑如何进行跳跃。假设当前位置为 i,当前能够到达的最远距离为 max_position,那么我们可以从 i+1 到 max_position 中找到一个位置 j,使得从 j 开始跳跃能够到达更远的位置。具体地,我们可以计算出从 i+1 到 max_position 中每个位置能够到达的最远距离,然后选择其中距离最远的位置作为下一次跳跃的起点。跳跃次数加 1,并将起点更新为 j。
重复上述过程,直到到达数组的最后一个位置。最后得到的跳跃次数即为最少需要跳跃的次数。
下面是 Python 代码实现:
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/* P0.0 to P0.7 are configured as GPIO outputs */
P0DIR |= 0xFF; // Set P0.0 to P0.7 as outputs
/* P1.0 to P1.7 are configured as GPIO inputs */
P1DIR &= 0x00; // Set P1.0 to P1.7 as inputs
/* P2.0 is configured as a GPIO output */
P2DIR |= 0x01; // Set P2.0 as an output
/* P3.0 to P3.3 are configured as GPIO inputs */
P3DIR &= 0xF0; // Set P3.0 to P3.3 as inputs
/* P4.0 is configured as a GPIO output */
P4DIR |= 0x01; // Set P4.0 as an output
/* P5.0 to P5.7 are configured as GPIO inputs */
P5DIR &= 0x00; // Set P5.0 to P5.7 as inputs
/* P6.0 to P6.7 are configured as GPIO outputs */
P6DIR |= 0xFF; // Set P6.0 to P6.7 as outputs
/* P7.0 to P7.7 are configured as GPIO inputs */
P7DIR &= 0x00; // Set P7.0 to P7.7 as inputs
/* P8.0 to P8.7 are configured as GPIO outputs */
P8DIR |= 0xFF; // Set P8.0 to P8.7 as outputs
/* P9.0 to P9.7 are configured as GPIO inputs */
P9DIR &= 0x00; // Set P9.0 to P9.7 as inputs
/* P10.0 to P10.7 are configured as GPIO outputs */
P10DIR |= 0xFF; // Set P10.0 to P10.7 as outputs
/* P11.0 to P11.7 are configured as GPIO inputs */
P11DIR &= 0x00; // Set P11.0 to P11.7 as inputs
/* P12.0 to P12.7 are configured as GPIO outputs */
P12DIR |= 0xFF; // Set P12.0 to P12.7 as outputs
/* P13.0 to P13.7 are configured as GPIO inputs */
P13DIR &= 0x00; // Set P13.0 to P13.7 as inputs
/* P14.0 to P14.7 are configured as GPIO outputs */
P14DIR |= 0xFF; // Set P14.0 to P14.7 as outputs
/* P15.0 to P15.7 are configured as GPIO inputs */
P15DIR &= 0x00; // Set P15.0 to P15.7 as inputs
/* P16.0 to P16.7 are configured as GPIO outputs */
P16DIR |= 0xFF; // Set P16.0 to P16.7 as outputs
/* P17.0 to P17.7 are configured as GPIO inputs */
P17DIR &= 0x00; // Set P17.0 to P17.7 as inputs
/* P18.0 to P18.7 are configured as GPIO outputs */
P18DIR |= 0xFF; // Set P18.0 to P18.7 as outputs
/* P19.0 to P19.7 are configured as GPIO inputs */
P19DIR &= 0x00; // Set P19.0 to P19.7 as inputs
/* P20.0 to P20.7 are configured as GPIO outputs */
P20DIR |= 0xFF; // Set P20.0 to P20.7 as outputs
/* P21.0 to P21.7 are configured as GPIO inputs */
P21DIR &= 0x00; // Set P21.0 to P21.7 as inputs
/* P22.0 to P22.7 are configured as GPIO outputs */
P22DIR |= 0xFF; // Set P22.0 to P22.7 as outputs
/* P23.0 to P23.7 are configured as GPIO inputs */
P23DIR &= 0x00; // Set P23.0 to P23.7 as inputs
/* P24.0 to P24.7 are configured as GPIO outputs */
P24DIR |= 0xFF; // Set P24.0 to P24.7 as outputs
/* P25.0 to P25.7 are configured as GPIO inputs */
P25DIR &= 0x00; // Set P25.0 to P25.7 as inputs
/* P26.0 to P26.7 are configured as GPIO outputs */
P26DIR |= 0xFF; // Set P26.0 to P26.7 as outputs
/* P27.0 to P27.7 are configured as GPIO inputs */
P27DIR &= 0x00; // Set P27.0 to P27.7 as inputs
/* P28.0 to P28.7 are configured as GPIO outputs */
P28DIR |= 0xFF; // Set P28.0 to P28.7 as outputs
/* P29.0 to P29.7 are configured as GPIO inputs */
P29DIR &= 0x00; // Set P29.0 to P29.7 as inputs