제출 #1098762

#제출 시각아이디문제언어결과실행 시간메모리
1098762gustavo_d마상시합 토너먼트 (IOI12_tournament)C++17
0 / 100
60 ms13776 KiB
#include <bits/stdc++.h> using namespace std; #define fi first #define sc second struct Node { int on, rng_idx; Node(int _on=0, int _rng_idx=-1): on(_on), rng_idx(_rng_idx) {} Node operator+(Node right) { Node left = *this; return Node(left.on + right.on); } }; struct SEG { vector<Node> seg; int n; SEG(int _n) { n = 1; while (n < _n) n <<= 1; seg = vector<Node>(2*n); for (int i=0; i<_n; i++) { seg[n+i] = Node(1, i); } for (int i=n-1; i>=0; i--) { seg[i] = seg[2*i] + seg[2*i+1]; } } int bb(int v, int l, int r, int k) { // acha idx do k-ésimo ativo if (l == r) { return l; } int m = (l + r) / 2; if (seg[2*v].on >= k) return bb(2*v, l, m, k); else return bb(2*v+1, m+1, r, k - seg[2*v].on); } void turn_off(int v, int l, int r, int i) { // desativa posição i if (l == r) { seg[v].on = 0; return; } int m = (l + r) / 2; if (i <= m) turn_off(2*v, l, m, i); else turn_off(2*v+1, m+1, r, i); seg[v] = seg[2*v] + seg[2*v+1]; } }; const int MAXN = 2e5; // nós nó grafo; 0 raíz const int MAXLOG = 25; int f[MAXLOG+1][MAXN]; vector<pair<int,int>> rngs; struct NodeMax { int mx; NodeMax(int _mx=-1e9): mx(_mx) {} NodeMax operator+(NodeMax right) { NodeMax left = *this; return NodeMax(max(left.mx, right.mx)); } }; struct SEGMax { vector<NodeMax> seg; int n; SEGMax(int _n) { n = 1; while (n < _n) n <<= 1; seg = vector<NodeMax> (2*n); } void update(int v, int l, int r, int i, int val) { if (l == r) { seg[v].mx = val; return; } int m = (l + r) / 2; if (i <= m) update(2*v, l, m, i, val); else update(2*v+1, m+1, r, i, val); seg[v] = seg[2*v] + seg[2*v+1]; } NodeMax mx(int v, int l, int r, int a, int b) { // contido if (a <= l and r <= b) return seg[v]; // fora if (r < a or l > b) return NodeMax(); // parcialmente int m = (l + r) / 2; return mx(2*v, l, m, a, b) + mx(2*v+1, m+1, r, a, b); } }; int GetBestPosition(int N, int C, int R, int *K, int *S, int *E) { // lê input int n = N; int qs = C; // rounds int late = R; vector<int> pos(n-1); for (int i=0; i<n-1; i++) pos[i] = K[i]; pair<int,int> rounds[qs]; for (int i=0; i<qs; i++) { rounds[i] = {S[i]+1, E[i]+1}; } // gera ranges e relação entre eles for (int i=0; i<n; i++) { rngs.emplace_back(i, i); } SEG seg(n); for (int i=0; i<qs; i++) { // cout << "round" << rounds[i].fi << ' ' << rounds[i].sc << '\n'; vector<int> nodes; for (int j=rounds[i].fi; j<=rounds[i].sc; j++) { // cout << j << '(' << seg.bb(1, 0, seg.n-1, j) << ')'; nodes.push_back(seg.bb(1, 0, seg.n-1, j)); // cout << ' '; } // cout << endl; // aponta ranges pro novo int new_rng_idx = (int)rngs.size(); for (int node : nodes) { int rng_idx = seg.seg[seg.n + node].rng_idx; f[0][rng_idx] = new_rng_idx; } // novo range na posição do primeiro usado int l = rngs[seg.seg[seg.n + nodes[0]].rng_idx].first; int r = rngs[seg.seg[seg.n + nodes.back()].rng_idx].second; rngs.emplace_back(l, r); seg.seg[seg.n + nodes[0]].rng_idx = new_rng_idx; // desativa demais for (int j=1; j<(int)nodes.size(); j++) { seg.turn_off(1, 0, seg.n-1, nodes[j]); } } // binary lifting da árvore gerada int qty_rngs = (int)rngs.size(); f[0][qty_rngs-1] = -1; // for (int i=0; i<qty_rngs; i++) { // cout << rngs[i].fi << ' ' << rngs[i].sc << " cujo pai " << f[0][i] << endl; // } for (int b=1; b<=MAXLOG; b++) { for (int i=0; i<qty_rngs; i++) { if (f[b-1][i] == -1) { f[b][i] = -1; continue; } f[b][i] = f[b-1][f[b-1][i]]; } } // testa colocações do r int ans = 0; SEGMax segmx(2*n-1); for (int i=1; i<2*n-1; i+=2) { segmx.update(1, 0, segmx.n-1, i, pos[i/2]); } for (int i=0, pos=1; pos<=n; pos++, i+=2) { segmx.update(1, 0, segmx.n-1, i, late); int v = pos-1; // começa neste range int tmp_ans = 0; for (int b=MAXLOG; b>=0; b--) { if (f[b][v] == -1) continue; // cout << "check" << (1 << b) << endl; // ganha dentro do range f[b][v]? pair<int,int> rng = rngs[f[b][v]]; rng.fi++; rng.sc++; // cout << rng.first << ' ' << rng.second << endl; int li = i; int delta_l = pos - rng.fi; if (delta_l > 0) { delta_l--; li--; } li -= 2*delta_l; int ri = i; int delta_r = rng.sc - pos; if (delta_r > 0) { delta_r--; ri++; } ri += 2*delta_r; int mx = segmx.mx(1, 0, segmx.n-1, li, ri).mx; if (mx == late) { // ganha v = f[b][v]; tmp_ans += (1 << b); } } // cout << tmp_ans << endl; ans = max(ans, tmp_ans); segmx.update(1, 0, segmx.n-1, i, -1e9); } return ans; }
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