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Cod sursa(job #755629)
#include <fstream>
using namespace std;
ifstream in("nrcuv.in");
ofstream out("nrcuv.out");
int v[1001][27];
bool al[27][27];
int main()
{
int n,c,i,j;
char x1,x2;
in>>n>>c>>ws;
for(i=1;i<=26;i++)
al[i]=26;
for(i=1;i<=c;i++)
{
in>>x1>>x2>>ws;
al[x1-'a'+1][x2-'a'+1]=true;
}
for(i=1;i<=n;i++)
v[1][i]=1;
for(k=2;k<=n;k++)
for(i=1;i<=26;i++)
for(j=1;j<=26;j++)
if(al[i][j]== false)
return 0;
}