NaN Quantitavity – Quant Trading, Statistical Learning, Coding and Brainstorming

#include <iostream>
using namespace std;

int main()
{
    char s[] = "Battle of the Vowels: Hawaii vs. Grozny";
    char r[] = "aeiou";

    int *flags = new int[128]; // assumes ASCII!
    int src, dst;

    // Set flags for characters to be removed
    for( src = 0; src < strlen(r); ++src )
    {
        flags[(int)r[src]] = 1;
    }

    src = 0; dst = 0;

    while(src<strlen(s))
    {
        if(flags[(int)s[src]]!=1)
        {
            s[dst++] = s[src];
        }
        src++;
    }

    delete[] flags;

    char* res = new char[dst+1];
    strncpy(res, s, dst);
    res[dst] = '';
    cout<<res<<endl;

    delete[] res;
    return 0;
}
/*
int main(){
    char s[] = "Battle of the Vowels: Hawaii vs. Grozny";
    char r[] = "aeiou";
    char* sNew = new char[strlen(s)];

    int* flag = new int[128];
    for (int i=0; i < strlen(r); i++){
        flag[(int)r[i]]=1;
    }

    int iNew = 0;
    for (int i=0; i < strlen(s); i++){
        if (flag[(int)s[i]]!=1){
            sNew[iNew++] = s[i];
        }
    }
    sNew[iNew]='';

    cout<<sNew<<endl;
    delete[] flag;
    delete[] sNew;

    return 0;
}
*/
//Highlighted at http://tohtml.com/cpp/

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

// The first 128 code points (0–127) of Unicode correspond to
// the letters and symbols on a standard U.S. keyboard.

// C stype string is an array of char, and ended by '' automatically;
// char x[]="abc"; then strlen(x)=3;
// char x[]="abcdef"; then strlen(x)=3;
// char x[]="abc"; then the real memory is 

bool isUniqueChars(string str) {
    bool char_set[256] = {0};
    for (int i = 0; i < str.size(); i++) {
        int val = str[i];
        if (char_set[val]) return false;
        char_set[val] = true;
    }
    return true;
}

int main()
{
    char str[20] = "abcd", xRepeat = ' ';
    bool iRepeat = false;
    int i = 0, len = strlen(str);

    for (i = 0; i < len;i++)
    {
        iRepeat = false;
        for (int j = 0; j < len; j++)
        {
            if (j!=i && str[j]==str[i])
            {
                iRepeat = true;
                break;
            }
        }
        if(!iRepeat)
        {
            xRepeat = str[i];
            break;
        }    
    }
    cout<<"In the string of "<<str<<endl;
    cout<<"the first nonrepeat char is the "<< i+1 << " th char: "<<xRepeat<<endl<<endl;
    cout<<isUniqueChars(str)<<endl;
    return 0;
}
//Highlighted at http://tohtml.com/cpp/
//Bred 3 + C++