1038. Recover the Smallest Number (30)

本文介绍了一种用于处理字符串数组中前导零问题的排序算法实现。该算法通过自定义比较函数来确保字符串按数值大小而非字典顺序排序,并在输出时进一步去除不必要的前导零。

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注意除去前面零的几种情况

#include<iostream>
#include<algorithm>
#include<vector>
#include<map> 
#include<string>
#include<set>
using namespace std;
vector<string> s;
bool comp(string a, string b){
	string s1 = a + b;
	string s2 = b + a;
	if(s1 < s2) return true;
	else return false;
}
int main(){
	int n;
	cin>>n;
	for(int i = 0; i < n; i++){
		string temp;
		cin>>temp;
		s.push_back(temp);
	} 
	sort(s.begin(),s.end(),comp);
	bool beginzero = true;
	for(int i = 0; i < n; i++){
		int j = 0;
	    while(j < s[i].size()){
		    if(s[i][j] != '0' || beginzero == false){
			    printf("%c",s[i][j]);
			    beginzero = false;
		    }
		    j++;
	    }
	}
	if(beginzero == true) cout<<0;//都是零 
	return 0;
}
 

1、样例的情况,只要考虑首串前面部分元素的零问题

2、可能存在一个串或多个串元素都是零

3、所有串所有元素都是零,输出结果应为“0”,序号2的两分点就是考查这个


ECDSA.recover is a function in the ECDSA (Elliptic Curve Digital Signature Algorithm) cryptographic system that allows a user to recover the public key from a given signature and message. This function is useful in situations where the public key is unknown but the signature and message are available. The ECDSA algorithm involves three steps: key generation, signature generation, and signature verification. In the key generation step, a private key is generated using a random number generator, and the corresponding public key is derived from the private key. In the signature generation step, a message is hashed and signed using the private key to generate a signature. In the signature verification step, the signature is verified using the public key to ensure that it was generated by the owner of the private key. In some cases, the public key may not be available, but the signature and message are known. In such cases, the ECDSA.recover function can be used to recover the public key from the signature and message. The function takes three inputs: the message, the signature, and the recovery parameter. The recovery parameter is a number between 0 and 3 that specifies which of the four possible public keys should be recovered from the signature. Once the public key is recovered, it can be used to verify the signature and authenticate the message. Overall, ECDSA.recover is a useful function in the ECDSA cryptographic system that allows for public key recovery in situations where it is unknown but the signature and message are available.
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