Wheel of fortune

input/code.cpp: In function 'void Test()':
input/code.cpp:12:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     freopen("temp\\in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
input/code.cpp: In function 'int main()':
input/code.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
input/code.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~

#include<iostream>
#include<cstdio>
#include<algorithm>
typedef long long LL;
using std::max;
const int N=1e5+3, INF = 0x3f3f3f3f;

int a[N], f[N][10];

void Test()
{
    freopen("temp\\in.txt", "r", stdin);
}
int main()
{
    // Test();
    int n;
    scanf("%d", &n);
    for(int i=1; i<=n; i++)
        scanf("%d", &a[i]);

    f[1][1] = a[1];
    f[1][5] = -a[1];

    f[2][1] = -INF;
    f[2][2] = f[1][1] - a[2];
    f[2][3] = f[1][1];
    f[2][3+1] = f[1][5] + a[2];
    f[2][3+2] = -INF;
    f[2][3+3] = f[1][5];
    f[2][6+1] = f[1][9] + a[2];
    f[2][6+2] = f[1][9] - a[2];
    f[2][6+3] = -INF;

    for(int i=3; i<n; i++)
    {
        for(int j=1; j<=3; j++)
        {
            j = j*3 - 3;
            // choose
            f[i][j+1] = max(f[i-1][j+2], f[i-1][j+3]);
            f[i][j+1] += a[i];
            // unchoose
            f[i][j+2] = max(f[i-1][j+1], f[i-1][j+3]);
            f[i][j+2] -= a[i];
            // ignore
            f[i][j+3] = max(f[i-1][j+1], f[i-1][j+2]);
        }
    }

    f[n][1] = -INF;
    f[n][2] = f[n-1][3] - a[n];
    f[n][3] = f[n-1][2];
    f[n][3+1] = f[n-1][3+3] + a[n];
    f[n][3+2] = -INF;
    f[n][3+3] = f[n-1][3+1];
    f[n][6+1] = f[n-1][6+2] + a[n];
    f[n][6+2] = f[n-1][6+1] - a[n];
    f[n][9] = -INF;

    int ans = -INF;
    for(int i=1; i<=9; i++)
        ans = max(ans, f[n][i]);

// for(int i=1; i<=n; i++)
// {
//     for(int j=1; j<=9; j++)
//         printf("%d ", f[i][j]);
//     putchar('\n');
// }

    // printf("%d", ans);
    return 0;
}

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