Odd sequence

input/code.cpp: In function 'int main()':
input/code.cpp:10:21: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int64_t* {aka long int*}' [-Wformat=]
     scanf("%lld",a+i);
                     ^
input/code.cpp:28:20: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int64_t {aka long int}' [-Wformat=]
   printf("%lld\n",r);
                    ^
input/code.cpp:6:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&n);
                 ^
input/code.cpp:10:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",a+i);
                      ^

#include <stdio.h>
#include <stdint.h>
int64_t a[1010101];
int n;
int main(){
  scanf("%d",&n);
  int64_t v = 0;
  int64_t r = -1e9;
  for(int i=0;i<n;++i){
    scanf("%lld",a+i);
    if(a[i]>r)r=a[i];
  }
  int j=0;
  for(int i=0;i+1<n;i+=2){
    if(v<0 || (v==0 && j>0 && a[j-1] < a[i-1]))v=a[i]+a[i+1],j=i;
    else v+=a[i]+a[i+1];
    if(i+2<n && (v+a[i+2])>r)r=v+a[i+2];
    if(j>0 && (v+a[j-1])>r)r=v+a[j-1];
  }
  j=0;
  v=0;
  for(int i=1;i+1<n;i+=2){
    if(v<0 || (v==0 && j>0 && a[j-1] < a[i-1]))v=a[i]+a[i+1],j=i;
    else v+=a[i]+a[i+1];
    if(i+2<n && (v+a[i+2])>r)r=v+a[i+2];
    if(j>0 && (v+a[j-1])>r)r=v+a[j-1];
  }
  printf("%lld\n",r);
  return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED

Test 31

Verdict: ACCEPTED

Test 32

Verdict: ACCEPTED

Test 33

Verdict: ACCEPTED

Test 34

Verdict: ACCEPTED

Test 35

Verdict: ACCEPTED

Test 36

Verdict: ACCEPTED

Test 37

Verdict: ACCEPTED

Test 38

Verdict: ACCEPTED

Test 39

Verdict: ACCEPTED

Test 40

Verdict: ACCEPTED

Test 41

Verdict: ACCEPTED

Test 42

Verdict: ACCEPTED

Test 43

Verdict: ACCEPTED

Test 44

Verdict: ACCEPTED

Test 45

Verdict: ACCEPTED

Test 46

Verdict: ACCEPTED

Test 47

Verdict: ACCEPTED

Test 48

Verdict: ACCEPTED

Test 49

Verdict: ACCEPTED

Test 50

Verdict: ACCEPTED

Test 51

Verdict: ACCEPTED