문제
풀이
#include <iostream>
#include <vector>
using namespace std;
void solve(void) {
int n; cin >> n;
int ans = 0;
while (n--) {
vector<int> t(3);
for (int i=0; i<3; i++) cin >> t[i];
if (t[0] == -1 && t[1] == -1 && t[2] == -1) continue;
if (t[0] == -1) t[0] = 1e9;
if (t[1] == -1) t[1] = 1e9;
if (t[2] == -1) t[2] = 1e9;
if (t[0] <= t[1] && t[1] <= t[2]) ans++;
}
cout << ans;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}