48 lines
795 B
C++
48 lines
795 B
C++
#include <bits/stdc++.h>
|
|
using namespace std;
|
|
|
|
bool check(const auto &t) {
|
|
int pos = (t[1] > t[0]) ? 1 : -1;
|
|
for (int i = 0; i < t.size() - 1; i++) {
|
|
int diff = (t[i + 1] - t[i]) * pos;
|
|
if (diff < 1 || diff > 3) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
int main() {
|
|
ios::sync_with_stdio(0);
|
|
cin.tie(0);
|
|
|
|
int total = 0;
|
|
string line;
|
|
while (getline(cin, line) && !line.empty()) {
|
|
istringstream l(line);
|
|
vector<int> t;
|
|
while (!l.eof()) {
|
|
int x;
|
|
l >> x;
|
|
t.push_back(x);
|
|
}
|
|
if (check(t)) {
|
|
total++;
|
|
} else {
|
|
for (int i = 0; i < t.size(); i++) {
|
|
vector<int> tt;
|
|
for (int j = 0; j < t.size(); j++) {
|
|
if (j == i)
|
|
continue;
|
|
tt.push_back(t[j]);
|
|
}
|
|
if (check(tt)) {
|
|
total++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
cout << total << '\n';
|
|
}
|