PAT 1060. Are They Equal

本文介绍了一种将超长数字转换为科学计数法的方法,包括处理整数和小数部分多余0的情况、真值为0的特殊处理、以及如何处理整数部分为0的小数。通过C++代码实现,探讨了不同情况下指数的变化。

0.abc...(a!=0)型科学计数法表示

此题因为数据超长需用字符串进行处理,有一些细节需要注意

1. 整数部分之前和小数部分之后可能都有多余的0

2.真值为0的数的指数都计作0

3.类似0.0008之类整数为0且小数部分有前导0的数要转化为0.8来考虑并相应修改指数

4.转化后的数可能后面要补0




#include<iostream>  
#include<stdio.h>  
#include<string.h>  

using namespace std;  
char a[105],b[105];  

int a1,b1;

void change(char ch[],int num,int& x)
{
    int i,flag,ls,lp,le;
	
	for( i=0,flag=0;ch[i]!='\0';i++)	
		if(ch[i]!='0'&&ch[i]!='.')
		{
			flag=1;
			break;
		}
		
		if(flag==0)           //全零
		{
			for(i=0;i<num;i++)
				ch[i]='0';
            ch[i]='\0';
			x=0;
			
		}
		else
		{
			for(i=0;ch[i]!='\0';i++)
				if(ch[i]>='1'&&ch[i]<='9')
				{
					ls=i;  
					break;
				}
				
				lp=-1;            
				for (i=0;ch[i]!='\0';i++)
					if(ch[i]=='.')
					{
						lp=i;
						break;
					}
					
					
					for (i=0;ch[i]!='\0';i++)
						;
					
					for(;i>=0;i--)
						if(ch[i]>='1'&&ch[i]<='9')
						{
							le=i;  
							break;
						}
						
						
						if(lp==-1)       //没有小数点
						{
							
							if(ls==0)
							{
								int k;
								for(k=ls;ch[k]>='0'&&ch[k]<='9';k++)   
									;
								x=k;
							}
							else
							{
								x=le-ls+1;
							}	
							
							for(i=ls;i<=le;i++)
								ch[i-ls]=ch[i];
							
							int y=le-ls;
							if(y<num)
							{
								while(y<num-1)
								{
									ch[i-ls]='0';
									i++;
									y++;
								}
								ch[i-ls]='\0';
							}	
							else
							{
								
								ch[num]='\0';
							}
                            
						}
						else
						{
							if(ls<lp&&lp<le)       //几零点零几
							{
								
								for(i=ls;i<lp;i++)
									ch[i-ls]=ch[i];
								i++;
								for(;i<=le;i++)
									ch[i-ls-1]=ch[i];
								
								x=lp-ls;
								
								int y=le-ls;
								
								if(y<num)
								{
									while(y<num)
									{
										ch[i-ls-1]='0';
										i++;
										y++;
									}
									ch[i-ls-1]='\0';
								}	
								else
								{
									
									ch[num]='\0';
								}
								
								
								
							}
                            if(lp!=-1&&lp<ls&&ls<=le) //零点零几
							{
								
								for(i=ls;i<=le;i++)
									ch[i-ls]=ch[i];
								
								x=lp-ls+1;
								
								
								int y=le-ls+1;
								
                            	
								
								if(y<=num)
								{
									while(y<num)
									{
										ch[i-ls]='0';
										i++;
										y++;
									}
									ch[i-ls]='\0';
								}	
								else
								{
									ch[num]='\0';
								}
								
								
							}
                            if(ls<=le&&le<lp)     
							{
								
								for(i=ls;i<=le;i++)
									ch[i-ls]=ch[i];
								
								x=lp-ls; 
								
								
								int y=le-ls+1;
								
								if(y<=num)
								{
									while(y<num)
									{
										ch[i-ls]='0';
										i++;
										y++;
									}
									ch[i-ls]='\0';
								}	
								else
								{
									ch[num]='\0';
								}
								
									
								
							}
								
							
						}
		}
		
			
		
}



void com(char ch1[],char ch2[],int num)
{
    change(ch1,num,a1);
    change(ch2,num,b1);
	
	
    int same=1;
    for(int t=0;ch1[t]!='\0'&&ch2[t]!='\0';t++)
        if(ch1[t]!=ch2[t])   
		{
			same=0;
			break;
		}
		
		
		if(same&&a1==b1) 
		{
			
			printf("YES 0.%s*10^%d\n",ch1,a1);
			
		}
		else 
		{
			printf("NO 0.%s*10^%d 0.%s*10^%d\n",ch1,a1,ch2,b1);
		}
}

int main()
{
    int n;
	scanf("%d%s%s",&n,a,b);
	com(a,b,n);
	return 0;
}




(c++题解,代码运行时间小于200ms,内存小于64MB,代码不能有注释)It’s time for the company’s annual gala! To reward employees for their hard work over the past year, PAT Company has decided to hold a lucky draw. Each employee receives one or more tickets, each of which has a unique integer printed on it. During the lucky draw, the host will perform one of the following actions: Announce a lucky number x, and the winner is then the smallest number that is greater than or equal to x. Ask a specific employee for all his/her tickets that have already won. Declare that the ticket with a specific number x wins. A ticket can win multiple times. Your job is to help the host determine the outcome of each action. Input Specification: The first line contains a positive integer N (1≤N≤10 5 ), representing the number of tickets. The next N lines each contains two parts separated by a space: an employee ID in the format PAT followed by a six-digit number (e.g., PAT202412) and an integer x (−10 9 ≤x≤10 9 ), representing the number on the ticket. Then the following line contains a positive integer Q (1≤Q≤10 5 ), representing the number of actions. The next Q lines each contain one of the following three actions: 1 x: Declare the ticket with the smallest number that is greater than or equal to x as the winner. 2 y: Ask the employee with ID y all his/her tickets that have already won. 3 x: Declare the ticket with number x as the winner. It is guaranteed that there are no more than 100 actions of the 2nd type (2 y). Output Specification: For actions of type 1 and 3, output the employee ID holding the winning ticket. If no valid ticket exists, output ERROR. For actions of type 2, if the employee ID y does not exist, output ERROR. Otherwise, output all winning ticket numbers held by this employee in the same order of input. If no ticket wins, output an empty line instead. Sample Input: 10 PAT000001 1 PAT000003 5 PAT000002 4 PAT000010 20 PAT000001 2 PAT000008 7 PAT000010 18 PAT000003 -5 PAT102030 -2000 PAT000008 15 11 1 10 2 PAT000008 2 PAT000001 3 -10 1 9999 1 -10 3 2 1 0 3 1 2 PAT000001 3 -2000 Sample Output: PAT000008 15 ERROR ERROR PAT000003 PAT000001 PAT000001 PAT000001 1 2 PAT102030
08-12
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