Using multiple conditions in an if statement in C++

Question

I am trying to create a complex if statement in C++ that will save me from writing a whole bunch of if statements, I am wondering if this code below actually makes sense or I am

Answer 1

You have a typo in input="paper" && choice=="rock"), but instead of fixing the typo I would suggest you to fix the code. No wonder you made a typo in this giant block of conditions. You have lots of repetion and mixing logic with output. If you spend some lines on includes, you can save some on code...

#include <iostream>
#include <string>
#include <vector>
#include <utility>
#include <algorithm>

bool win(const std::string& input, const std::string& choice) {
    static const std::vector<std::pair<std::string, std::string>> wins = 
            { { "rock", "scissors" },
              { "scissors", "paper"  },
              { "paper", "rock" }
            };
    return std::find(wins.begin(), wins.end(), std::make_pair(input, choice))
        != wins.end();
}

int main() {
    std::string choice = "paper";
    std::string input = "scissors";
    if (win(choice, input)) { std::cout << "you win! \n"; }
    else                    { std::cout << "you lose! \n"; }
}

As next step you should eliminate all that strings, eg by using enums as discussed in the comments.