Question

I was writing a code , in which when i declare a vector globally , it gives wrong answer but when i declare it in the main function . it becomes right . so i want to know the difference between the two declarations

this is a code which find the min of first enteries, and 2nd min of 2nd enteries and then if min >= 2nd min print no . here i declared vector in the main class but when i declare it with my INTs declared , the site on which i was submitting gives me wrong answer.

#include<iostream>
#include<algorithm>
#include<vector>
#include<cstdio>

using namespace std;

#define MAX 20000;
int a,b,c,d,i,z;


int main()
{
        scanf("%d %d", &a, &b);
        while( a!=0 && b!=0)
        {
            z = MAX;
            for(i=0;i<a;i++)
            {
                scanf("%d",&c);
                if(z>c)
                {
                    z=c;
                }
            }


            vector<int> v;  
            for(i=0;i<b;i++)
            {
                scanf("%d",&d);
                v.push_back(d);
            }
            sort(v.begin(),v.end());

            if (z >= v[1])
            printf("N\n");
            else
            printf("Y\n");
        scanf("%d %d", &a, &b);
        }       
    return 0;
}

Sudhanshu

Answer 1

If you declare the vector as a global variable, you should invoke vector::clear() in the begin of the loop to clear all of the elements stored in the last loop.