This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include "trilib.h"
using namespace std;
#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define per(i, a, b) for (int i = b - 1; i >= (a); --i)
#define trav(a, x) for (auto &a : x)
#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define pb push_back
#define umap unordered_map
#define uset unordered_set
typedef pair<int, int> ii;
typedef pair<int, ii> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef long long ll;
const int INF = 1000000007;
int main() {
cin.tie(0)->sync_with_stdio(0);
cin.exceptions(cin.failbit);
bitset<40001> taken;
int n = get_n();
vi cities;
rep(i, 2, n + 1) {
int lo = 0, hi = sz(cities);
while (lo != hi) {
int mid = (lo + hi) >> 1;
if (is_clockwise(1, cities[mid], i))
hi = mid;
else
lo = mid + 1;
}
cities.insert(cities.begin() + lo, i);
}
stack<int> s;
s.push(1);
s.push(cities[0]);
cities.pb(1);
rep(i, 1, sz(cities)) {
int b = s.top(), c = cities[i];
s.pop();
int a = s.top();
if (!is_clockwise(a, b, c)) s.push(b);
s.push(c);
}
s.pop();
vi hull;
while (!s.empty()) {
hull.pb(s.top());
s.pop();
}
hull.pop_back();
if (is_clockwise(hull.back(), 1, hull[0])) hull.pb(1);
/*
reverse(all(hull));
trav(city, hull) cout << city << ' ';
cout << endl;*/
give_answer(sz(hull));
return 0;
}
Compilation message (stderr)
tri.cpp: In function 'int main()':
tri.cpp:7:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
7 | #define rep(i, a, b) for (int i = a; i < (b); ++i)
| ^
tri.cpp:52:5: note: in expansion of macro 'rep'
52 | rep(i, 1, sz(cities)) {
| ^~~
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |