nzz_decode.cpp

// UNCOMMENT THE NEXT LINE TO ENABLE THE TESTS AND BEFORE SUBMITTING
//#include "tests.h"
#include <iostream>
#include <fstream>
#include <string>

char convertToChar(std::string a);
void runThroughString(std::string &a);
int main(){
    std::cin >> std::noskipws;
    std::string input;
    std::cin >> input;
    std::ifstream in(input.c_str());
    std::string value;
    std::string a;
    while(in >> value){
        a = value;
        std::cout <<  convertToChar(a);
    }
}

char convertToChar(std::string a){
    int res = 0;
    int num = 0;
    for(int i = 0; i < 8; i++){ // convert binary to int
            if((int)a[i] == 49) num = 1; // convert ascii to int
            else num = 0;
            res = res * 2 + num;
        }
    return (char)res; 
}

vecmat.cpp

// UNCOMMENT THE NEXT LINE TO ENABLE THE TESTS AND BEFORE SUBMITTING 
#include "tests.h" 
#include <iostream> 
#include <vector> 
 
void read_in(int letter, std::vector<std::vector<int> >& v);
void print(int letter, std::vector<std::vector<int> >& v);
void cross_product(std::vector<std::vector<int> >& a,std::vector<std::vector<int> >& b,std::vector<std::vector<int> >& res);
void matrix_vector(std::vector<std::vector<int> >& a,std::vector<std::vector<int> >& b,std::vector<std::vector<int> >& res);
void matrix_product(std::vector<std::vector<int> >& a,std::vector<std::vector<int> >& b,std::vector<std::vector<int> >& res);

int main(){ 
    char input[2]; 
    std::vector<std::vector<int> >a (3, std::vector<int>(3,0)); 
    std::vector<std::vector<int> >b (3, std::vector<int>(3,0)); 
    std::vector<std::vector<int> >res (3, std::vector<int>(3,0)); 
    //read input 
    std::cin >> input[0]; 
    std::cin >> input[1]; 
    
    read_in((int)input[0],a);
    read_in((int)input[1],b);
    
    if((int)input[0] == (int)input[1]){
        if((int)input[0] == 118){
            cross_product(a,b,res);
        }
        else{
            matrix_product(a,b,res);
        }
    }
    else{
        matrix_vector(a,b,res);
    }
    print((int)input[1],res);
}

void read_in(int letter, std::vector<std::vector<int> >& v){
    if(letter==118){//v
        for(int i = 0; i <3; i++){
            std::cin >> v[0][i];
        }
    }
    else{//m //109
        for(int i = 0; i < 3; i++){
            for(int j = 0; j < 3; j++){
                std::cin >> v[i][j];
            }
        }
    }
}
void print(int letter, std::vector<std::vector<int> >& v){
        if(letter==118){//v
        for(int i = 0; i <3; i++){
            std::cout << v[0][i] << "\n";
        }
    }
    else{//m //109
        for(int i = 0; i < 3; i++){
            for(int j = 0; j < 3; j++){
                std::cout << v[i][j] <<  " ";
            }
            std::cout << "\n";
        }
    }
}
void cross_product(std::vector<std::vector<int> >& a,std::vector<std::vector<int> >& b,std::vector<std::vector<int> >& res){
    int pos = 1;
    for(int i = 0; i < 3; i++){
        res[0][i] = a[0][pos]*b[0][((pos+1)%3)] - a[0][((pos+1) % 3)]*b[0][pos];
        pos = (pos+1)%3;
    }
}
void matrix_vector(std::vector<std::vector<int> >& a,std::vector<std::vector<int> >& b,std::vector<std::vector<int> >& res){
    for(int i = 0; i < 3 ; i++){
        for(int j = 0; j <3; j++){
            res[0][i] += b[0][j] * a[i][j];
        }
    }
}
void matrix_product(std::vector<std::vector<int> >& a,std::vector<std::vector<int> >& b,std::vector<std::vector<int> >& res){
    for(int i = 0; i<3; i++){
        for(int j=0; j<3; j++){
            for(int k=0; k<3; k++){
                res[i][j] += a[i][k] * b[k][j];
            }
        }
    }
}