1.简写单词

题目链接：1037-简写单词_牛客竞赛语法入门班数组字符串习题

 

每次取出输出的首字母，如果首字母是小写，则将其变成大写输出，如果是大写，则直接输出

java">import java.util.*;public class Main{public static void main(String[] args){Scanner scanner =new Scanner(System.in);while(scanner.hasNext()){char ch =scanner.next().charAt(0);if(ch>='a' && ch<='z'){ch=(char)(ch-32);System.out.print(ch);}else{System.out.print(ch);}}}}

2.dd爱框框

题目链接：F-dd爱框框_牛客小白月赛34 

由于本道题使用Scanner时会显示运行超时，所以我们需要自己定义一个快排

java">import java.util.*;
import java.io.*;public class Main{public static void main(String[] args)throws IOException{Read scanner=new Read();int n=scanner.nextInt();int x=scanner.nextInt();int left=1;int right=1;int ret=n;int retleft=-1,retright=-1;int[] array=new int[n+1];int sum=0;for(int i=1;i<=n;i++){array[i]=scanner.nextInt();}while(right<=n){sum+=array[right];while(sum>=x){if(right-left+1<ret){retleft=left;retright=right;ret=right-left+1;}sum-=array[left++];}right++;}System.out.print(retleft+" "+retright);}
}
class Read // 自定义快速读入
{StringTokenizer st = new StringTokenizer("");BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));String next() throws IOException {while(!st.hasMoreTokens()){st = new StringTokenizer(bf.readLine());}return st.nextToken();}String nextLine() throws IOException {return bf.readLine();}int nextInt() throws IOException {return Integer.parseInt(next());}long nextLong() throws IOException {return Long.parseLong(next());}double nextDouble() throws IOException {return Double.parseDouble(next());}
}

 3.除2 ！

题目链接：除2！

java">import java.util.*;
public class Main{public static void main(String[] args) {Scanner scanner=new Scanner(System.in);int n=scanner.nextInt(),k=scanner.nextInt();PriorityQueue<Integer> heap=new PriorityQueue<>((a,b) ->{return b-a;});long sum=0,x;for (int i = 0; i < n; i++) {x= scanner.nextLong();sum+=x;if(x%2==0){heap.add((int)x);}}while (!heap.isEmpty() && k--!=0){long t= heap.poll()/2;sum-=t;if(t%2==0){heap.add((int)t);}}System.out.println(sum);}
}

希望能对大家有所帮助！！！！！