[Kick Start 2022 Round C] Ants on a Stick

Ants on a Stick

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#include <bits/stdc++.h>

#pragma optimization_level 3
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("Ofast")//Comment optimisations for interactive problems (use endl)
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")

#define MAX_N 22
#define INF 987654321
#define EPS 1e-9
#define ll long long
#define pll pair<ll, ll>
#define vpll vector<pll>
#define vall3 vector<array<ll,3>>
#define all3 array<ll,3>
#define all5 array<ll,5>
#define vall5 vector<all5>
#define vll vector<ll>
#define vs vector<string>
#define usll unordered_set<ll>
#define vvs vector<vs>
#define vvll vector<vll>
#define all(a) begin(a), end(a)

using namespace std;

vll solve(ll l, vpll ants) {
vpll pos, dis;
ll n = ants.size(), left = 0, right = n - 1;
vll res;
for(ll i = 0; i < n; i++) {
pos.push_back({ants[i].first, i});
dis.push_back({ ants[i].second ? l - ants[i].first : ants[i].first, i});
}
sort(all(pos));
sort(all(dis));
for(ll i = 0, m; i < n; i++) {
m = i;
vll tmp;
while(m < n and dis[i].first == dis[m].first) {
auto d = ants[dis[m++].second].second;
if(d) tmp.push_back(pos[right--].second);
else tmp.push_back(pos[left++].second);
}
sort(all(tmp));
i = m - 1;
for(auto& id : tmp) res.push_back(id + 1);
}

return res;
}

int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
ll tc;
cin >> tc;
for (ll i = 1; i <= tc; i++) {
ll n, l, d, p;
vpll ants;
cin >> n >> l;
for (ll i = 0; i < n; i++) {
cin >> p >> d;
ants.push_back({p, d});
}
auto res = solve(l, ants);
cout << "Case #" << i << ": ";
for (auto r : res)cout << r << ' ';
cout << endl;
}

return 0;
}
Author: Song Hayoung
Link: https://songhayoung.github.io/2022/05/23/PS/Google/ants-on-a-stick/
Copyright Notice: All articles in this blog are licensed under CC BY-NC-SA 4.0 unless stating additionally.