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In your hash function, you're doing x.size() in a loop, which will slow the function down quite a lot for a long string. Instead, store the size in a variable and compare to that

int hash(const string &x)
{
 int y=0;
 int xLength = x.size();
 for (int i = 0; i < xLength; ++i){
 y+=x[i]*137;
 }
 return y%1000;
}

Also, you're using namespace::std. Don't do that, for good reasons. As well as this, if you're having to explain your variable names that last for a while and actually require explanation (I'm looking at V, u, v, c), maybe name them something else? Or at least include comments if they're the convention that people would expect that would give someone who doesn't know the convention a chance.