Unique and smallest bid finder algorithm and program

Nowadays, online sites like Flipkart and Amazon are running competitions to post a unique and smallest bid on a product. Here is the source code in C to find the unique and smallest bid.

#include <stdio.h>
int main()
{
int n,i,j,flag;
float bid[100],unique;
printf("Enter the number of bids\n");
scanf("%d",&n);
printf("\n");
printf("Enter the bids\n");
for(i=0;i<n;i++)
{
scanf("%f",&bid[i]);
}
unique=bid[0];
for(i=1;i<n;i++)
{
flag=0;
for(j=0;j<i;i++)
{
if(bid[j]==bid[i])
flag=1;
}
if(flag==0&&bid[i]<unique)
unique=bid[i];
}
printf("The unique and smallest bid is %f",unique);
}