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WA...cant fix the bug

#include<cstdio>
#include<iostream>
#include<sstream>
#include<algorithm>
#include<cstdlib>
#include<queue>
#include<vector>
#include<cstring>
#include<map>
using namespace std;


char L[1024];
vector<string>graph;

int adjmatrix[256][256],n;
bool visited[256];
int dist[256 ...

can anyone help me finding the bug????

#include<iostream>
#include<algorithm>
using namespace std;


class Point{

public:
int x,y;
void input(int a,int b);

};


void Point:: input(int a,int b)
{ x=a;
y=b;

return ;
}

int cross(Point pi,Point pj,Point pk)
{ int a,b;
//cout<<"calling cross ...

Can anyone help me?I m continuously getting runtime error...