CrackingTheCodeInterviewProblem1.1

Problem1_1.cpp

#include <cstdio>
#include <iostream>
#include <algorithm>

using namespace std;

int main(){
    char c;
    bool chars[256];
    bool dup_flag = false;
    fill_n(chars, 256, false);
    while(std::cin >> c){
        if(!chars[c]){
            chars[c] = true;
        }else{
            cout << "All of chars in input string is not unique" << endl;
            dup_flag = true;
            break;
        }
    }
    if(!dup_flag)
        cout << "All of chars in input string is unique" << endl;
}