题解 | 小红的方神题spj

#include <stdio.h>
#include <stdlib.h>

int main() {
    int n;
    scanf("%d\n", &n);
    int arr[n];
    for (int i = 0; i < n; ++i) {
        scanf("%d", &arr[i]);
    }
    for (int i = n - 1; i > 0; --i) {
        for (int j = 0; j < i; ++j) {
            arr[j] = abs(arr[j] - arr[j + 1]);
        }
    }
    printf("%d\n", arr[0]);
    return 0;
}