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pls anyone tell the basic step in the maximum interval sum.

i got WA . but i do not know why i get WA. pls someone help me.
my code is given below:




#include<stdio.h>

#include<math.h>

#include<string.h>

#include<algorithm>

using namespace std;

int prime(int num)

{

int f,n;

if( num==2 )

return 1;

if(num==1 || num==0 || num%2==0)

return 0 ...