debugging suddenly stops

[noktalivirgul]

for(i =0; i< 2500; i++){
			if(i==k){
				dist[i]=100000;
				continue;}
			euc=0;
			for(j=0;j<2;j++){
				euc+=(v.at(i).at(j)-v.at(k).at(j))*(v.at(i).at(j)-v.at(k).at(j));
				euc=sqrt(euc);
			}
			dist[i]=euc;}
		for(i =0; i< 2500; i++){
			if(dist[i]<min)
				min=dist[i];
				n=i;
			}
		float result= v.at(n).at(3);
		cout << "the prediction for the power of the tribune # " << k<<":"<< result<< "\n";	

program stops debugging suddenly and says "An unhandled exception of type 'System.Runtime.InteropServices.SEHException' occurred in orjin.exe".

[Moschops]

Does the debugger not tell you the line that caused the exception?

[noktalivirgul]

no it doesn't. but i know where the problem is. the poblem disappears when i delete this line:
float result= v.at(n).at(3);

but how can i call this variable then?

[Moschops]

What's the value of n at that point, and what's the size of v?

[ne555]

@OP: learn to indent. And with that I mean don't indent your code because you will mess up.
Let the IDE do it.

Line 14.

[Chervil]

Lines 11 to 15 look suspicious.

As written:

    for (i=0; i<2500; i++) 
    {
        if (dist[i] < min)
            min = dist[i];
        
        n = i;
    }

But perhaps this is what was actually supposed to be?

    for (i=0; i<2500; i++) 
    {
        if (dist[i] < min)
        {
            min = dist[i];
            n = i;
        }
    }