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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int N = 2e5 + 1;
  5. int n, c[N], last[N], dp[N];
  6.  
  7. int main(int argc, char **argv) {
  8. 	int t;
  9. 	scanf("%d", &t);
  10. 	while (t-- != 0) {
  11. 		scanf("%d", &n);
  12. 		for (int i = 0; i < n; ++i)
  13. 			scanf("%d", &c[i]);
  14. 		memset(last, -1, sizeof last);
  15. 		last[c[0]] = 0;
  16. 		for (int i = 1; i < n; ++i) {
  17. 			dp[i] = dp[i - 1] + 1;
  18. 			if (last[c[i]] != -1)
  19. 				dp[i] = min(dp[i], dp[last[c[i]]] + 1);
  20. 			last[c[i]] = i;
  21. 		}
  22. 		printf("%d\n", dp[n - 1]);
  23. 	}
  24. 	return 0;
  25. }
Success #stdin #stdout 0.18s 17576KB
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https://ideone.com/ysugUh
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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