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Recently, I wrote a Sudoku solver in C++. My program is very hard and was solved in a few seconds. In my opinion, this is slow.
#include <iostream>
#include <conio.h>
#include <stdlib.h>
#include <time.h>
using namespace std;
int tab_in[9][9] = {{0,0,0,0,0,0,0,1,0},
{4,0,0...