1 #include <bits/stdc++.h> 2 3 using namespace std; 4 5 const int maxn = 5000000; 6 7 int t; 8 9 int s,n; 10 11 int a[maxn+10]; 12 13 int res[maxn+10]; 14 15 int flag[maxn+10]; 16 17 void init(){ 18 memset(a, 0, sizeof(a)); 19 memset(res, 0, sizeof(res)); 20 memset(flag, 0, sizeof(flag)); 21 } 22 23 24 25 int main(){ 26 //freopen("a.txt", "w", stdout); 27 scanf("%d",&t); 28 while(t--){ 29 init(); 30 scanf("%d%d",&s, &n); 31 for(int i = 1; i <= n; ++i){ 32 scanf("%d",&a[i]); 33 } 34 for(int i = 1; i <= s; ++i){ 35 a[i+n] = i + maxn/10; 36 } 37 38 int temp = s; 39 for(int i = 1; i <= n+s-1; ++i){ 40 if(i <= s){ 41 42 temp -= 1; 43 flag[a[i]] += 1; 44 45 if(flag[a[i]] == 1){ 46 temp += 1; 47 } else if(flag[a[i]] == 2){ 48 temp -= 1; 49 } 50 if(temp == s){ 51 52 res[i] = 1; 53 } 54 } else { 55 56 flag[a[i-s]] -= 1; 57 58 if(flag[a[i-s]] == 0){ 59 temp -= 1; 60 } else if(flag[a[i-s]] == 1){ 61 temp += 1; 62 } 63 64 flag[a[i]] += 1; 65 if(flag[a[i]] == 1){ 66 temp += 1; 67 } else if(flag[a[i]] == 2){ 68 temp -= 1; 69 } 70 71 if(temp == s){ 72 73 res[i%s] = res[i%s]&1; 74 } else { 75 res[i%s] = 0; 76 } 77 } 78 } 79 80 int ans = 0; 81 if(n <= s && res[n] == 1){ 82 ans = s; 83 } else { 84 for(int i = 1; i <= s; ++i){ 85 if(res[i] == 1){ 86 ++ans; 87 } 88 } 89 } 90 printf("%d ",ans); 91 92 } 93 }