求救
#include <bits/stdc++.h>
using namespace std;
int n, m, a[1000010], c[2001], ans = 1e9;
int x = 1e9, y = 1e9;
int main() {
cin >> n >> m;
for (register int i = 1; i <= n; ++i) scanf("%d", a + i);
int l = 1, r = 1, cnt = 0;
memset(c, 0, sizeof(c));
while (l <= r && r <= n) {
if (cnt == m) {
if (r - l + 1 < ans) {
ans = r - l + 1;
x = l, y = r;
}
--c[a[l]];
cnt -= !c[a[l]];
++l;
continue;
}
++r;
cnt += !c[a[r]];
++c[a[r]];
}
cout << x << ' ' << y;
}