Wrong answer in The lead Game

c
game
lead
the
wrong
wrong-answer

#1

here is my code, have tried many corner test cases i read in comments and on other forums, getting correct output on my compiler, but wrong answer on codechef

#include<stdio.h>
int fastread()
{
int input;
char c=0;
while (c<33) c=getchar();
input=0;
while (c>33)
{
input=input*10+c-'0';
c=getchar();
}
return input;
}
int main()
{
    int t,i,j,k,l,max,loc=1;
    int lead=0,suma=0,sumb=0;
    int a[10001][5];
    int leader[10001],win[10001];
    
   t=fastread();
    for(i=0;i<t;i++)
    {
               for(j=0;j<2;j++)
              a*[j]=fastread();
    }
    
    for(k=0;k<t;k++)
    {
    j=0;
   suma=suma+a[k][j];
   sumb=sumb+a[k][j+1];
    lead=suma-sumb;
    if(lead>0)
    {
    win[k]=1;    
    leader[k]=lead;
}
    else
    {
    win[k]=2;
    leader[k]=~lead+1;
}

}
max=leader[0];
for(k=1;k<t;k++)
{
          
 if(leader[k]>max)
 {
 max=leader[k];
 loc=k;
 }
 l=win[loc];

                }    
                printf("%d%d",l,max);

return 0;
}