TASK_052 - ChimengSoso's Solution

#include <stdio.h>

int a[123];

int main() {
    int n;
    scanf("%d", &n);

    for (int i = 1; i <= n; ++i) {
        scanf("%d", &a[i]);
    }

    int cntPeak = 0;
    for (int i = 1; i <= n; ++i) {
        int l = a[i-1], m = a[i], r = a[i+1];
        if (l == m) return printf("No\n"), 0;
        if (l < m and m > r)
            ++cntPeak;
    }

    printf("%s\n", cntPeak == 1 ? "Yes" : "No");
    return 0;
}