| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 145912 |
2019-08-21T10:58:30 Z |
nvmdava |
Triangles (CEOI18_tri) |
C++17 |
|
3 ms |
504 KB |
#include <bits/stdc++.h>
#include "trilib.h"
#define ff first
#define ss second
#define ll long long
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int n, root, t;
map<ll, bool> lol;
bool get(ll a, ll b, ll c){
ll en = a * 40001 * 40001 + b * 40001 + c;
if(lol.find(en) != lol.end())
return lol[en];
return lol[en] = is_clockwise(a, b, c);
}
class Compare{
public:
bool operator()(const int& lhs, const int& rhs){
return get(root, lhs, rhs);
}
};
set<int, Compare> le, ri;
vector<int> hull, hull2;
int main() {
n = get_n();
root = rng() % n + 1;
t = rng() % n + 1;
while(root == t){
root = rng() % n + 1;
t = rng() % n + 1;
}
for(int i = 1; i <= n; i++){
if(root == i || t == i) continue;
if(get(t, root, i))
ri.insert(i);
else
le.insert(i);
}
for(int x : le)
hull.push_back(x);
hull.push_back(root);
for(int x : ri)
hull.push_back(x);
hull.push_back(t);
int v1 = hull[0];
int v2 = hull[1];
hull2.push_back(v1);
hull2.push_back(v2);
for(int i = 2; i < hull.size(); i++){
while(hull2.size() > 2 && get(hull2[hull2.size() - 2], hull2[hull2.size() - 1], hull[i])) hull2.pop_back();
hull2.push_back(hull[i]);
}
swap(hull2, hull);
hull2.clear();
while(true){
for(int i = 0; i < hull.size(); i++){
int l = i - 1;
int r = i + 1;
if(l == -1) l = hull.size() - 1;
if(r == hull.size()) r = 0;
l = hull[l];
r = hull[r];
if(!hull2.empty())
l = hull2.back();
if(get(l, hull[i], r))
hull2.push_back(hull[i]);
}
swap(hull2, hull);
if(hull.size() == hull2.size()) break;
hull2.clear();
}
give_answer(hull.size());
}
Compilation message
tri.cpp: In function 'int main()':
tri.cpp:61:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 2; i < hull.size(); i++){
~~^~~~~~~~~~~~~
tri.cpp:70:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < hull.size(); i++){
~~^~~~~~~~~~~~~
tri.cpp:74:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(r == hull.size()) r = 0;
~~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
256 KB |
Output is correct |
| 3 |
Runtime error |
3 ms |
504 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
256 KB |
Output is correct |
| 3 |
Runtime error |
3 ms |
504 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
256 KB |
Output is correct |
| 3 |
Runtime error |
3 ms |
504 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
256 KB |
Output is correct |
| 3 |
Correct |
2 ms |
256 KB |
Output is correct |
| 4 |
Correct |
2 ms |
256 KB |
Output is correct |
| 5 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
256 KB |
Output is correct |
| 3 |
Runtime error |
3 ms |
504 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 4 |
Halted |
0 ms |
0 KB |
- |
