Submission #1215921

#TimeUsernameProblemLanguageResultExecution timeMemory
1215921steveonalexComparing Plants (IOI20_plants)C++20
25 / 100
1581 ms5192 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef unsigned long long ull; #define MASK(i) (1LL << (i)) #define GETBIT(mask, i) (((mask) >> (i)) & 1) #define ALL(v) (v).begin(), (v).end() #define block_of_code if(true) ll max(ll a, ll b){return (a > b) ? a : b;} ll min(ll a, ll b){return (a < b) ? a : b;} ll gcd(ll a, ll b){return __gcd(a, b);} ll lcm(ll a, ll b){return a / gcd(a, b) * b;} ll LASTBIT(ll mask){return (mask) & (-mask);} int pop_cnt(ll mask){return __builtin_popcountll(mask);} int ctz(ull mask){return __builtin_ctzll(mask);} int logOf(ull mask){return 63 - __builtin_clzll(mask);} mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count()); ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);} double rngesus_d(double l, double r){ double cur = rngesus(0, MASK(60) - 1); cur /= MASK(60) - 1; return l + cur * (r - l); } template <class T1, class T2> bool maximize(T1 &a, T2 b){ if (a < b) {a = b; return true;} return false; } template <class T1, class T2> bool minimize(T1 &a, T2 b){ if (a > b) {a = b; return true;} return false; } template <class T> void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){ for(auto item: container) out << item << separator; out << finish; } template <class T> void remove_dup(vector<T> &a){ sort(ALL(a)); a.resize(unique(ALL(a)) - a.begin()); } #include "plants.h" ostream& operator << (ostream& os, pair<int, int> x){ os << "(" << x.first << ", " << x.second << ")"; return os; } const int N = 5005, LOG_N = 20; const int INF = 1e9 + 69; int n, k; int order[N * 2]; int nxt1[LOG_N][N * 2], nxt2[LOG_N][N*2]; void init(int _k, vector<int> r){ n = r.size(), k = _k; for(int it = 0; it < n; ++it){ vector<int> dis(n); dis[0] = 1; for(int i = 1; i < 2 * n; ++i){ int j1 = (i - 1) % n, j2 = i % n; if (r[j1] == 0) dis[j2] = 1; else dis[j2] = dis[j1] + 1; } int pos = -1; for(int i = 0; i < n; ++i) if (r[i] == 0 && dis[i] >= k) pos = i; if (pos == -1) assert(false); for(int i = 1; i < k; ++i) r[(pos + n - i) % n]--; r[pos] = INF; order[pos] = order[pos + n] = n - it; } set<pair<int, int>> S; S.insert(make_pair(0, 2 * n)); nxt1[0][2*n] = 2*n; for(int i = 2 * n - 1; i >= 0; --i){ if (i + k < 2 * n) S.erase(make_pair(order[i + k], i + k)); auto it = S.upper_bound(make_pair(order[i], -1)); if (it != S.begin()){ it--; pair<int,int> cur = *it; nxt1[0][i] = cur.second; } S.insert(make_pair(order[i], i)); } S.clear(); S.insert(make_pair(0, -1)); nxt2[0][0] = 0; for(int i = 0; i < 2 * n; ++i){ if (i - k >= 0) S.erase(make_pair(order[i - k], i - k)); auto it = S.upper_bound(make_pair(order[i], -1)); if (it != S.begin()){ it--; pair<int,int> cur = *it; nxt2[0][i + 1] = cur.second + 1; } S.insert(make_pair(order[i], i)); } for(int j = 1; j < LOG_N; ++j) for(int i = 0; i <= 2 * n; ++i){ nxt1[j][i] = nxt1[j-1][nxt1[j-1][i]]; nxt2[j][i] = nxt2[j-1][nxt2[j-1][i]]; } } bool check_more_than(int x, int y){ // check if (x) > (y) // walk from x to y if (y - x < k){ return 1; } else{ for(int j = LOG_N - 1; j >= 0; --j) { int _x = nxt1[j][x]; if (y - _x >= k) x = _x; } x = nxt1[0][x]; if (x == y || (x < y && order[x] > order[y])) return 1; } return 0; } bool check_less_than(int x, int y){ // check if (x) < (y) // walk from y to x if (y - x < k){ return 1; } else{ for(int j = LOG_N - 1; j >= 0; --j) { int _y = nxt2[j][y+1]-1; if (_y - x >= k) y = _y; } y = nxt2[0][y+1]-1; if (x == y || (x < y && order[x] < order[y])) return 1; } return 0; } int compare_plants(int x, int y){ if (order[x] > order[y]){ // either x is larger than y, or it is inconclusive if (check_more_than(x, y) || check_less_than(y, x + n)) return 1; } else{ // either x is larger than y, or it is inconclusive if (check_more_than(y, x + n) || check_less_than(x, y)) return -1; } return 0; }
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