#include <stdio.h> int set[1000000]; int a[1000000]; int main() { int n, k; scanf("%d%d", &n, &k); for (int i = 0; i < n; i++) scanf("%d", &a[i]); int look=0; int pos=0; long long result=0; while (pos<k && look<n) { if (set[a[look]] == 0) { set[a[look]] = 1; look++; pos++; result += look - pos; } else look++; } if (pos == k) printf("%lld\n", result); else printf("-1\n"); return 0; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #include <stdio.h> int set[1000000]; int a[1000000]; int main() { int n, k; scanf("%d%d", &n, &k); for (int i = 0; i < n; i++) scanf("%d", &a[i]); int look=0; int pos=0; long long result=0; while (pos<k && look<n) { if (set[a[look]] == 0) { set[a[look]] = 1; look++; pos++; result += look - pos; } else look++; } if (pos == k) printf("%lld\n", result); else printf("-1\n"); return 0; } |