Submission #1022823

#TimeUsernameProblemLanguageResultExecution timeMemory
1022823Mr_HusanboyJousting tournament (IOI12_tournament)C++17
100 / 100
76 ms8548 KiB
#include <bits/stdc++.h> using namespace std; #define ll long long #define ff first #define ss second #define all(a) (a).begin(), (a).end() template<typename T> int len(T &a){return a.size();} struct fenwick{ vector<int> t; int n; fenwick(){ } fenwick(int _n){ init(_n); } void init(int _n){ n = _n; t.assign(n,0); } void init(vector<int> &a){ init(size(a)); for(int i = 0; i < n; i ++){ inc(i,a[i]); } } void inc(int i, int val = 1){ for(; i < n; i = i | (i + 1)){ t[i] += val; } } int get(int i){ int sum = 0; for(; i >= 0; i = (i & (i + 1)) - 1){ sum += t[i]; } return sum; } int get(int l, int r){ return get(r) - get(l - 1); } int findkthone(int k){ int l = -2, r = n; while(r - l > 1){ int m = (l + r) / 2; if(get(m) < k){ l = m; }else r = m; } return r; } void out(){ for(int i = 0; i < n; i ++){ cout << get(i) - get(i - 1); }cout << endl; } }; struct DSU{ int n; vector<int> p, sz; DSU (){} DSU (int n) : n(n), p(n), sz(n){ for(int i = 0; i < n; i++){ p[i] = i, sz[i] = 1; } } int get(int a){ return a == p[a] ? a : p[a] = get(p[a]); } void unite(int a, int b){ a = get(a), b = get(b); if(a == b) return; if(sz[a] < sz[b]) swap(a, b); sz[a] += sz[b]; p[b] = a; } void link(int a, int b){ a = get(a), b = get(b); if(a == b) return; p[a] = b; sz[b] += sz[a]; } }; template<typename T> void out(T a){ cout << "{"; for(auto u : a) cout << u << ' '; cout << "}" << endl; } struct Segtree{ int n; vector<int> t; int merge(int a, int b){ return max(a, b); } Segtree (){} Segtree (int n) : n(n), t(2 * n){} void build(vector<int> &a, int _n){ n = _n; t.resize(2 * n); for(int i = 0; i < n; i ++){ t[i + n] = a[i]; } for(int i = n - 1; i > 0; i --){ t[i] = merge(t[i * 2], t[i * 2 + 1]); } } void upd(int i, int val){ i += n; t[i] = val; for(i /= 2; i > 0; i /= 2) t[i] = merge(t[i * 2], t[i * 2 + 1]); } int get(int l, int r){ l += n; r += n; int res = 0; while(l <= r){ if(l & 1){ res = merge(res, t[l ++]); } if(!(r & 1)){ res = merge(res, t[r --]); } r /= 2; l /= 2; } return res; } }; int GetBestPosition(int n, int c, int r, int *k, int *s, int *e){ fenwick f(n); DSU ds(n + 1); for(int i = 0; i < n; i ++) f.inc(i, 1); for(int j = 0; j < c; j ++){ int l = f.findkthone(s[j] + 1); vector<int> p = {l}; int sz = e[j] - s[j]; s[j] = f.findkthone(s[j]) + 1; while(len(p) < sz){ l = ds.get(l + 1); p.push_back(l); } e[j] = ds.get(l + 1); for(auto u : p){ f.inc(u, -1); ds.link(u, u + 1); } } vector<vector<int>> lef(n); for(int i = 0; i < c; i ++) lef[s[i]].push_back(e[i]); int last = 0; vector<int> pref(n + 1); for(int i = 0; i < n - 1; i ++){ if(k[i] > r){ if(i == last){ last = i + 1; continue; } for(int j = last; j <= i; j ++){ for(auto r : lef[j]){ if(r > i) continue; pref[j] ++; pref[r + 1] --; } } last = i + 1; } } if(last != n - 1){ for(int j = last; j < n; j ++){ for(auto r : lef[j]){ if(r > n) continue; pref[j] ++; pref[r + 1] --; } } } int mx = -1; int ans = 0; int wins = 0; for(int i = 0; i < n; i ++){ wins += pref[i]; //cout << wins << endl; if(mx < wins){ mx = wins; ans = i; } } return ans; }
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