Drying

https://vjudge.net/contest/291737#problem/E

最让HSQ学长头疼的就是洗衣服了。洗完之后,每件衣服都有一定单位水分,在不使用烘干器的情况下,每件衣服每分钟自然流失1个单位水分,但如果使用了烘干机则每分钟流失K个单位水分。令人遗憾是HSQ所在的宿舍楼只有1台烘干机,而每台烘干机同时只能烘干1件衣服,请问要想烘干N件衣服最少需要多长时间?

输入

第一行输入N,表示有N件衣服,第二行输入N件衣服的水分ai,第三行表示烘干机每分钟烘干水分K 
其中
1 ≤ N ≤ 100 000,1 ≤ ai ≤ 10^9,1 ≤ K≤ 10^9

输出

输出烘干N件衣服所需要的最短时间

样例输入


3
2 3 9
5


3
2 3 6
5

样例输出


3


2

二分,注意范围,要用long long

比赛的时候用得int,,,没过

所用的最小时间的范围在(0,晾干含有水分最多的所用时间]之间

如果k==1,直接输出晾干含有水分最多的所用时间;

否则就二分,可以把烘干机烘干的水分看成两份,一份是晾干的(1),一份是烘干的(k-1),每一件衣服都先减去晾干的水分,

如果没干就要用烘干机,如果用烘干机的次数大于使用的最大次数(也就等于时间),就说明这个时间不可能让所有的衣服变干

 

 

#include <iostream>
#include<stdio.h>
#include<string>
#include<string.h>
#include<math.h>
#include<algorithm>
const int inf=0x3f3f3f3f;
using namespace std;
int n,k;
long long N[100100];
void solve()
{
    scanf("%d",&n);

        long long r=0,l=0;//要用long long
        for(long long i=0; i<n; i++)
        {
            scanf("%lld",&N[i]);
            if(N[i]>r)
                r=N[i];//需要用烘干机
        }
        scanf("%d",&k);
        if(k==1)
          printf("%lld\n",r);
        else
        {
            k--;
            while(r-l>1)//二分搜索
            {
                long long mid=(l+r)/2;
                long long s=mid;
                for(long long i=0; i<n; i++)
                {
                    long long m=N[i]-mid;
                    if(m>0)
                    {
                        s-=((m-1)/k+1);
                    }
                }
                if(s>=0)
                    r=mid;
                else
                    l=mid;
            }
            printf("%lld\n",r);
        }


}
int main()
{
   solve();
   return 0;
}

 

/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2025 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "adc.h" #include "tim.h" #include "gpio.h" #include "fsmc.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include "lcd.h" // ¥]§tLCD?? #include <string.h> #include <stdio.h> /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ // ¬~¦çÉó??ªT? typedef enum { WASH_MODE, SPIN_DRY_MODE, DRYING_MODE } WashMode; /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ // «ö?©w? - ®ÚÕu??µw¥ó?±µ­×§ï #define KEY1_PIN GPIO_PIN_4 #define KEY1_PORT GPIOE #define KEY2_PIN GPIO_PIN_3 #define KEY2_PORT GPIOE // LED«ü¥Ü?©w? - ®ÚÕu??µw¥ó?±µ­×§ï #define LED_GREEN_PIN GPIO_PIN_0 #define LED_GREEN_PORT GPIOB #define LED_RED_PIN GPIO_PIN_1 #define LED_RED_PORT GPIOB // «ö?®ø§Ý??(ms) #define DEBOUNCE_DELAY 50 /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ /* USER CODE BEGIN PV */ // ¬~¦çÉó???¶q WashMode currentMode = WASH_MODE; uint8_t timerMinutes = 30; // Àq?30¤À? uint8_t displayState = 0; // 0:?¥Ü¼Ò¦¡, 1:?¥Ü?? /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); /* USER CODE BEGIN PFP */ // ¨ç??©ú void UpdateDisplay(void); void ProcessKey1(void); void ProcessKey2(void); /* USER CODE END PFP */ /* Private user code ---------------------------------------------------------*/ /* USER CODE BEGIN 0 */ // «ö?®ø§Ý¨ç? uint8_t IsKeyPressed(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin) { if (HAL_GPIO_ReadPin(GPIOx, GPIO_Pin) == GPIO_PIN_RESET) { HAL_Delay(DEBOUNCE_DELAY); if (HAL_GPIO_ReadPin(GPIOx, GPIO_Pin) == GPIO_PIN_RESET) { while (HAL_GPIO_ReadPin(GPIOx, GPIO_Pin) == GPIO_PIN_RESET); // µ¥«Ý«ö??©ñ return 1; } } return 0; } /* USER CODE END 0 */ /** * @brief The application entry point. * @retval int */ int main(void) { /* USER CODE BEGIN 1 */ /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); MX_TIM3_Init(); MX_ADC1_Init(); MX_FSMC_Init(); /* USER CODE BEGIN 2 */ // ªì©l¤ÆLCD LCD_Init(); LCD_Clear(WHITE); LCD_SetTextColor(BLACK); LCD_SetBackColor(WHITE); // ?¥Ü?ªï¬É­± LCD_DisplayStringLine(LINE(0), (uint8_t *)" WASHING MACHINE "); LCD_DisplayStringLine(LINE(1), (uint8_t *)" STM32F407VET6 "); LCD_DisplayStringLine(LINE(3), (uint8_t *)" Press Key1: Mode "); LCD_DisplayStringLine(LINE(4), (uint8_t *)" Press Key2: Timer "); // ªì©l??¡G??«G¡A??? HAL_GPIO_WritePin(LED_GREEN_PORT, LED_GREEN_PIN, GPIO_PIN_SET); HAL_GPIO_WritePin(LED_RED_PORT, LED_RED_PIN, GPIO_PIN_RESET); // ªì©l?¥Ü¬~¦ç¼Ò¦¡ UpdateDisplay(); HAL_Delay(2000); // ?¥Ü?ªï«H®§2¬í /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ // «ö??´y if (IsKeyPressed(KEY1_PORT, KEY1_PIN)) { ProcessKey1(); } if (IsKeyPressed(KEY2_PORT, KEY2_PIN)) { ProcessKey2(); } HAL_Delay(10); // ?¤ÖCPU¥e¥Î } /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** Configure the main internal regulator output voltage */ __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); /** Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 4; RCC_OscInitStruct.PLL.PLLN = 168; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 4; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB buses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { Error_Handler(); } } /* USER CODE BEGIN 4 */ // §ó·sLCD?¥Ü void UpdateDisplay(void) { char buffer[20]; LCD_Clear(WHITE); if (displayState == 0) { // ?¥Ü¬~¦ç¼Ò¦¡ LCD_DisplayStringLine(LINE(0), (uint8_t *)" WASHING MODE "); switch(currentMode) { case WASH_MODE: LCD_DisplayStringLine(LINE(2), (uint8_t *)" WASHING "); break; case SPIN_DRY_MODE: LCD_DisplayStringLine(LINE(2), (uint8_t *)" SPIN DRY "); break; case DRYING_MODE: LCD_DisplayStringLine(LINE(2), (uint8_t *)" DRYING "); break; } LCD_DisplayStringLine(LINE(5), (uint8_t *)" Press Key1: Next "); LCD_DisplayStringLine(LINE(6), (uint8_t *)" Press Key2: Timer"); } else { // ?¥Ü©w??? LCD_DisplayStringLine(LINE(0), (uint8_t *)" TIMER SETTING "); snprintf(buffer, sizeof(buffer), " %d minutes ", timerMinutes); LCD_DisplayStringLine(LINE(2), (uint8_t *)buffer); LCD_DisplayStringLine(LINE(5), (uint8_t *)" Press Key1: Mode "); LCD_DisplayStringLine(LINE(6), (uint8_t *)" Press Key2: Exit "); } } // ?²z«ö?1 - ¼Ò¦¡¤Á? void ProcessKey1(void) { if (displayState == 0) { // ¼Ò¦¡?¥Ü?? // ´`?¤Á?¬~¦ç¼Ò¦¡ currentMode = (currentMode + 1) % 3; } else { // ©w??¥Ü?? // ¼W¥[©w???¡]10-90¤À?¡^ timerMinutes = (timerMinutes < 90) ? timerMinutes + 10 : 10; } // §ó·s?¥Ü UpdateDisplay(); // ÚÌ«O??«G¡A??? HAL_GPIO_WritePin(LED_GREEN_PORT, LED_GREEN_PIN, GPIO_PIN_SET); HAL_GPIO_WritePin(LED_RED_PORT, LED_RED_PIN, GPIO_PIN_RESET); // ??¤Á?¦^¼Ò¦¡?¥Ü displayState = 0; } // ?²z«ö?2 - ©w??¥Ü void ProcessKey2(void) { if (displayState == 0) { // ?«e¬O¼Ò¦¡?¥Ü?? // ¤Á?¨ì©w??¥Ü displayState = 1; // ÚÌ«O??«G¡A??? HAL_GPIO_WritePin(LED_RED_PORT, LED_RED_PIN, GPIO_PIN_SET); HAL_GPIO_WritePin(LED_GREEN_PORT, LED_GREEN_PIN, GPIO_PIN_RESET); } else { // ?«e¬O©w??¥Ü?? // ¤Á?¦^¼Ò¦¡?¥Ü displayState = 0; // ÚÌ«O??«G¡A??? HAL_GPIO_WritePin(LED_GREEN_PORT, LED_GREEN_PIN, GPIO_PIN_SET); HAL_GPIO_WritePin(LED_RED_PORT, LED_RED_PIN, GPIO_PIN_RESET); } // §ó·s?¥Ü UpdateDisplay(); } /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ __disable_irq(); // ??????? while (1) { HAL_GPIO_TogglePin(LED_RED_PORT, LED_RED_PIN); HAL_Delay(200); } /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ 帮我修改
最新发布
06-06
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