#include "triples.h"
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define fi first
#define se second
#define pb push_back
vector<vector<ll> > isi;
vector<ll> h;
void cek(ll A, ll B, ll C) {
if(A >= B || B >= C) return ;
vector<ll> tmp1, tmp2;
tmp1.pb(h[A]);
tmp1.pb(h[B]);
tmp1.pb(h[C]);
tmp2.pb(B - A);
tmp2.pb(C - B);
tmp2.pb(C - A);
sort(tmp1.begin(), tmp1.end());
sort(tmp2.begin(), tmp2.end());
for(int i = 0; i < 3; i++) {
if(tmp1[i] != tmp2[i]) {
return ;
}
}
isi.pb({A, B, C});
}
long long count_triples(std::vector<int> H) {
ll N = H.size();
h.clear();
isi.clear();
for(ll i = 0; i < N; i++) {
h.pb(H[i]);
}
for(ll i = 0; i < N; i++) {
for(ll j = i + 1; j < N; j++) {
cek(i, i + H[i], j);
cek(i, i + H[j], j);
cek(i, j - H[i], j);
cek(i, j - H[j], j);
}
}
ll ret = 0;
sort(isi.begin(), isi.end());
for(ll i = 0; i < isi.size(); i++) {
if(i == 0 || isi[i - 1] != isi[i]) {
ret++;
}
}
return ret;
}
std::vector<int> construct_range(int M, int K) {
return {1, 1, 1};
}
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