常用技巧

1. stringstream

1.1 stringstream 基本用法

#include <bits/stdc++.h>

using namespace std;

signed main(){
	stringstream stream;
    int first, second;
    stream << "456"; //插入字符串
    stream >> first; //转换成int
    cout << first << endl;
    stream.clear(); //在进行多次转换前，必须清除stream
    stream << true; //插入bool值
    stream >> second; //提取出int
    cout << second << endl;
	
	return 0;
}

1.2 stringstream 分割单词

#include <bits/stdc++.h>

using namespace std;

signed main(){
	string str, abc;
	getline(cin, str);
	stringstream ss(str);
	cout << ss.str() << endl;
	while(ss >> abc){
		cout << abc << endl;
	}
	
	return 0;
}