题解 | #句子逆序#

#include<iostream>
#include<string>
using namespace std;

int main(){
    string input;
    getline(cin, input);   //if we just use cin >> input; the blank will be erased
    
    string result;
    
    while (!input.empty()) {
        size_t len = input.find_last_of(' ');// find ' ' for each string
        
        if (len != string::npos) {
            string word = input.substr(len+1);//extract the word after the ' '
            result += word;
            result += " ";
            input.erase(input.begin()+len, input.end());
        } else {
            result += input;  // for the last word
            input.erase(input.begin(), input.end());
        }
        
    }
    
    cout << result << endl;
    
    return EXIT_SUCCESS;
    
}