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  1. #include <bits/stdc++.h>
  2.  
  3. #define forn(i, n) for (int i = 0; i < int(n); i++)
  4. #define ford(i, n) for (int i = int(n) - 1; i >= 0; i--)
  5. #define fore(i, l, r) for (int i = int(l); i < int(r); i++)
  6. #define correct(x, y, n, m) (0 <= (x) && (x) < (n) && 0 <= (y) && (y) < (m))
  7. #define all(a) (a).begin(), (a).end()
  8. #define sz(a) int((a).size())
  9. #define pb(a) push_back(a)
  10. #define mp(x, y) make_pair((x), (y))
  11. #define x first
  12. #define y second
  13.  
  14. using namespace std;
  15.  
  16. typedef long long li;
  17. typedef long double ld;
  18. typedef pair<int, int> pt;
  19.  
  20. template<typename X> inline X abs(const X& a) { return a < 0? -a: a; }
  21. template<typename X> inline X sqr(const X& a) { return a * a; }
  22.  
  23. const int INF = int(1e9);
  24. const li INF64 = li(1e18);
  25. const ld EPS = 1e-9, PI = 3.1415926535897932384626433832795;
  26.  
  27. const int N = 200200;
  28.  
  29. int n, m;
  30. int a[N];
  31. int l[N], r[N], x[N];
  32.  
  33. inline bool read() {
  34.     if (!(cin >> n >> m)) return false;
  35.     forn(i, n) assert(scanf("%d", &a[i]) == 1);
  36.     forn(i, m) {
  37.         assert(scanf("%d%d%d", &l[i], &r[i], &x[i]) == 3);
  38.         l[i]--, r[i]--;
  39.     }
  40.     return true;
  41. }
  42.  
  43. int z[N];
  44.  
  45. inline void solve() {
  46.     z[0] = -1;
  47.     fore(i, 1, n) {
  48.         if (a[i - 1] != a[i]) z[i] = i - 1;
  49.         else z[i] = z[i - 1];
  50.     }
  51.  
  52.     forn(i, m) {
  53.         if (a[r[i]] != x[i]) printf("%d\n", r[i] + 1);
  54.         else if (z[r[i]] >= l[i]) printf("%d\n", z[r[i]] + 1);
  55.         else puts("-1");
  56.     }
  57. }
  58.  
  59. int main() {
  60. #ifdef SU1
  61.     assert(freopen("input.txt", "rt", stdin));
  62.     //assert(freopen("output.txt", "wt", stdout));
  63. #endif
  64.    
  65.     cout << setprecision(10) << fixed;
  66.     cerr << setprecision(5) << fixed;
  67.  
  68.     while (read()) {
  69.         solve();
  70.         //break;
  71.     }
  72.    
  73.     return 0;
  74. }
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