int Verificardigito () {
bool validar=true;
int x,y,n;
	
	cout<<"ingrese la coordenada x"<<endl;
	cin>>x;
	cout<<"ingrese la coordenada y"<<endl;
	cin>>y;
	cout<<"ingrese el valor"<<endl;
	cin>>n;
	for (int =0; i<9; i++){
	if (mat[x][i]==n or mat[i][y]==n) {
		va=true;
		break;
		if (va==true)
		cout<<"valor repetido"<<endl;
return (va);

for (int i=0; i<9; i++){
if ( j !=x) {
}
if ( mt[x][j]==x) {
}
return false;


for (int j=0; j<9; j++) {
if (j != x){
}
if (mat [j][x]==x){
}
return false;
}

#include <iostream>
using namespace std;

int main () {


int a,b,c,d,e,f,a11,a12,a13,a14,b11,b12,b13,b14,c11,c12,c13,c14,d11,d12,d13,d14;
	unsigned long long int x;
cout<<"introduzca la cadena"<<endl;
	cin>>x;
	


    a=x/100000000;
	b=x%100000000;
	c=a/10000;
	d=a%10000;
	e=b/10000;
	f=b%10000;
	a11=c/1000;
	c=c%1000;
	a12=c/100;
	c=c%100;
	a13=c/10;
	a14=c%10;
	b11=d/1000;
	d=d%1000;
	b12=d/100;
	d=d%100;
	b13=d/10;
	b14=d%10;
	c11=e/1000;
	e=e%1000;
	c12=e/100;
	e=e%100;
	c13=e/10;
	c14=e%10;
	d11=f/1000;
	f=f%1000;
	d12=f/100;
	f=f%100;
	d13=f/10;
	d14=f%10;
	
		
		if ((x/100000000000000000)==0){
		cout<<"Entrada incorrecta la cadena  debe contener 16 digitos"<<endl;}
		else
		{cout<<"solucion valida"<<endl;
		
		
		
		if (((a11!=1) and (a11!=2)  and (a11!=3)  and (a11!=4))  or 
			((a12!=1) and (a12!=2)  and (a12!=3)  and (a12!=4))  or 
			((a13!=1) and  (a13!=2) and (a13!=3)  and (a13!=4))  or  
			((a14!=1) and  (a14!=2) and  (a14!=3) and (a14!=4))  or 
			((b11!=1) and  (b11!=2) and  (b11!=3) and (b11!=4))  or  
			((b12!=1) and  (b12!=2) and  (b12!=3) and (b12!=4))  or  
			((b13!=1) and ( b13!=2) and  (b13!=3) and (b13!=4))  or  
			((b14!=1) and  (b14!=2) and  (b14!=3) and (b14!=4))  or  
			((c11!=1) and  (c11!=2) and  (c11!=3) and (c11!=4))  or  
			((c12!=1) and  (c12!=2) and  (c12!=3) and (c12!=4))  or  
			((c13!=1) and  (c13!=2) and  (c13!=3) and (c13!=4))  or  
			((c14!=1) and  (c14!=2) and (c14!=3)  and (c14!=4))  or 
			((d11!=1) and  (d11!=2) and  (d11!=3) and (d11!=4))  or 
			((d12!=1) and (d12!=2)  and (d12!=3)  and (d12!=4))  or  
			((d13!=1) and  (d13!=2) and (d13!=3)  and (d13!=4))  or  
			((d14!=1) and  (d14!=2) and  (d14!=3) and (d14!=4))){
		        cout<<"Entrada incorrecta, la cadena solo debe poseer digitos entre 1 y 4 "<<endl;}
	
				
					else {
					cout<<"Solucion valida"<<endl;}
}
				
			if ((a11 == a12) and 
				(a11 == b11) and 
				(a11 == b12) and 
				(a12 == b11) and 
				(a12 == b12) and 
				(b11 ==b12) ) {
                     cout<<"error en el cuadrante C1"<<endl;}
                     
                     
               if  ((a13==a14)  and
					(a13==b13) and
					(a13==b14) and
					(a14==b13) and
					(a14==b14) and 
					(b13==b14)) {
					cout<<" error en el cuadrante C2"<<endl;
						}
						
						
					if ((c11==c12) and
						(c11==d11) and
						(c11==d12) and
						(c12==d11) and
						(c12==d12) and 
						(d11==d12)) {
							cout<<"error en el cuadrante C3"<<endl;
						}
						 
					
						
					if	((c13==c14)and
						(c13==d13) and
						(c13==d14) and 
						(c14==d13) and
						(c14==d14) and
						(d13==d14)) {
							cout<<"error en el cuadrante C4"<<endl;
						}
						
				if ((a11==a12) and 
					 (a11==a13) and
					 (a11==a14)) {
					   cout<<"error en la fila 1"<<endl;}
					   
					   
				 if ((b11==b12)    and
					 (b11==b13)   and
					 (b11==b14)) {
					   cout<<"error en la fila 2"<<endl;}
					   
				 if((c11==c12) and
					(c11==c13) and
					(c11==c14)) {
						   cout<<"error en la fila 3"<<endl;}
						   
				if((d11==d12) and
					(d11==d13) and
					(d11==d14)) {
					cout<<"error en la fila 4"<<endl;}
							
					if (( a11==b11) and
						(a11==c11) and
						(a11==d11)) {
						cout<<"error en la columna 1"<<endl;}
								
					if ((a12==b12) and
						(a12==c12) and
						(a12==d12)) {
						cout<<"error en la columna 2"<<endl;}
									
					if((a13==b13) and
						(a13==c13) and
						(a13==d13))  {
						cout<<"error en la columna 3"<<endl;}
										
					if ((a14==b14) and
						(a14==c14) and
						(a14==d14)) {
						cout<<"error en la columna 4"<<endl;}
																			
}