제출 #1037928

#제출 시각아이디문제언어결과실행 시간메모리
1037928idas마상시합 토너먼트 (IOI12_tournament)C++11
100 / 100
167 ms17912 KiB
#include <bits/stdc++.h> #define FOR(i, begin, end) for(int i=(begin); i<(end); i++) #define pb push_back #define s second #define f first using namespace std; typedef long long ll; typedef vector<int> vi; typedef pair<int, int> pii; const int MxN=1e5+10, INF=1e9; int n, Rank, Start[MxN], s[MxN], e[MxN], fen[MxN], t[4*MxN], mx[MxN]; vi ad[MxN]; void upd(int p, int x) { for(int i=p; i<MxN; i+=i&(-i)) fen[i]+=x; } int get(int p) { int ret=0; for(int i=p; i>0; i-=i&(-i)) ret+=fen[i]; return ret; } int get_lin(int x) { int l=1, r=n; while(l<r){ int m=(l+r)/2; if(get(m)<x) l=m+1; else r=m; } return l; } int get_rin(int x) { int l=1, r=n; while(l<r){ int m=(l+r+1)/2; if(get(m)>x) r=m-1; else l=m; } return l; } void upd_max(int p, int x, int l=1, int r=n, int id=1) { if(l==r){ t[id]=x; return; } int m=(l+r)/2; if(p<=m) upd_max(p, x, l, m, id*2); else upd_max(p, x, m+1, r, id*2+1); t[id]=max(t[id*2], t[id*2+1]); } int get_max(int x, int y, int l=1, int r=n, int id=1) { if(r<x||l>y) return -1; if(x<=l&&r<=y) return t[id]; int m=(l+r)/2; return max( get_max(x, y, l, m, id*2), get_max(x, y, m+1, r, id*2+1) ); } int ans, max_wins; void dfs(int u, int wins=0) { // cout << u << " " << wins << endl; if(int(ad[u].size())==0 && mx[u]==Rank){ wins++; if(wins>max_wins){ max_wins=wins; ans=Start[u]; } } for(auto it : ad[u]){ if(mx[u]==Rank) dfs(it, wins+1); else dfs(it, 0); } } int GetBestPosition(int N, int c, int r, int *k, int *S, int *E) { n=N; Rank=r; FOR(i, 0, c) s[i]=S[i], e[i]=E[i]; set<pii> st; FOR(i, 1, n+1) upd(i, 1), st.insert({i,-1}); FOR(i, 1, n) { upd_max(i, k[i-1]); } FOR(i, 0, c) { int l_in=get_lin(s[i]+1), r_in=get_rin(e[i]+1); mx[i]=max(get_max(l_in, r_in-1), r); // cout << i << ": " << l_in << " " << r_in << " -> " << mx[i] << '\n'; vector<pii> er; auto it=st.lower_bound({l_in,-1}); while(it!=st.end() && (*it).f<=r_in){ er.pb(*it); int pos=(*it).f, in=(*it).s; if(in!=-1) ad[i].pb(in); upd(pos, -1); it++; } for(auto iter : er) st.erase(iter); st.insert({l_in,i}); Start[i]=l_in-1; upd(l_in, 1); // cout << i << ": "; // for(auto iter : ad[i]) cout << iter << " "; // cout << '\n'; } dfs(c-1); // cout << "wins: " << max_wins << endl; return ans; }
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