T710740 A. 坐电梯 [Hello World 2026 蓝桥杯选拔赛]

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

#define maxn 200
int n, ans;
int num[maxn];

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