#include <iostream>#include <cstdio>#include <cstdlib>#include <cstring>using namespace std;#define maxn 10005int a, b, n;double p[maxn], sum[maxn];int dblcmp(double a, double b){ if (a < b) return -1; return 1;}int main(){ scanf("%d%d%d", &a, &b, &n); sum[0] = 0; for (int i = 1; i <= n; i++) { scanf("%lf", &p[i]); sum[i] = sum[i - 1] + p[i]; } if (dblcmp((sum[b] - sum[0]) * a, (sum[b] - sum[b - a]) * b) < 0) printf("BUY ON DAY %dn", b); else printf("SELL ON DAY %dn", b); for (int i = b + 1; i <= n; i++) if (dblcmp((sum[i] - sum[i - b]) * a, (sum[i] - sum[i - a]) * b) < 0 && dblcmp((sum[i - 1] - sum[i - b - 1]) * a, (sum[i - 1] - sum[i - a - 1]) * b) > 0) printf("BUY ON DAY %dn", i); else if (dblcmp((sum[i] - sum[i - b]) * a, (sum[i] - sum[i - a]) * b) > 0 && dblcmp((sum[i - 1] - sum[i - b - 1]) * a, (sum[i - 1] - sum[i - a - 1]) * b) < 0) printf("SELL ON DAY %dn", i); return 0;}
