Card game

input/code.cpp: In function 'int main()':
input/code.cpp:3:11: warning: unused variable 'i' [-Wunused-variable]
   int n,c,i;
           ^
input/code.cpp:7:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&n);
   ~~~~~^~~~~~~~~
input/code.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&c);
     ~~~~~^~~~~~~~~

#include <stdio.h>
int main(){
  int n,c,i;
  int s[4],v[4];
  s[1]=s[2]=s[3]=-1e9;
  s[0]=0;
  scanf("%d",&n);
  for(int i=0;i<n;++i){
    v[0] = s[0];
    v[1] = s[1];
    v[2] = s[2];
    scanf("%d",&c);
    if(s[0]<v[2])s[0]=v[2];
    s[1]=v[0];
    s[2]=v[1]+c;
  }
  printf("%d\n",s[0]);
  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: UNKNOWN

Test 15

Verdict: UNKNOWN