Submission #382735

#TimeUsernameProblemLanguageResultExecution timeMemory
382735alireza_kavianiJousting tournament (IOI12_tournament)C++11
100 / 100
85 ms23268 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int, int> pii; #define X first #define Y second #define sep ' ' const int MAXN = (1 << 18); const int LOG = 18; int n , m , r , ans[MAXN] , fen[MAXN] , nxt[MAXN] , val[MAXN] , dpl[MAXN] , dpr[MAXN],fen2[MAXN]; vector<int> vec[MAXN]; vector<pair<pii , pii>> Q[MAXN]; void add(int x , int val){ for(x++ ; x < MAXN ; x += x & -x) fen[x] += val; } int get(int x){ int ans = 0; for(int i = (1 << (LOG - 1)) ; i ; i >>= 1){ if(fen[ans + i] <= x){ ans += i; x -= fen[ans]; } } return ans; } void update(int x , int val){ for(x += 2 ; x < MAXN ; x += x & -x) fen2[x] += val; } int query(int x){ int ans = 0; for(x += 2 ; x ; x -= x & -x) ans += fen2[x]; return ans; } int GetBestPosition(int N, int C, int R, int *K, int *S, int *E){ n = N; m = C; r = R; for(int i = 0 ; i < n - 1 ; i++){ val[i] = K[i]; nxt[i] = i + 1; add(i , 1); } add(n - 1 , 1); nxt[n - 1] = n; for(int i = 0 ; i < m ; i++){ int l = S[i] , r = E[i]; int cur = get(l) , tmp = cur; for(int j = 0 ; j < r - l + 1 ; j++){ add(cur , -1); cur = nxt[cur]; } nxt[tmp] = cur; add(tmp , 1); vec[tmp].push_back(cur - 1); // cout << tmp << sep << cur - 1 << endl; } //assert(fen[MAXN / 2] == 1); dpl[0] = -1; for(int i = 1 ; i < n ; i++){ dpl[i] = dpl[i - 1]; if(val[i - 1] > r) dpl[i] = i - 1; } dpr[n - 1] = n - 1; for(int i = n - 2 ; i >= 0 ; i--){ dpr[i] = dpr[i + 1]; if(val[i] > r) dpr[i] = i; } for(int i = 0 ; i < n ; i++){ if(dpl[i] >= 0) Q[dpl[i]].push_back({{i , -1} , {i - 1 , dpr[i]}}); Q[i].push_back({{i , 1} , {i - 1 , dpr[i]}}); } for(int i = 0 ; i < n ; i++){ // cout << i << sep << dpl[i] << sep << dpr[i] << endl; for(int j : vec[i]) update(j , 1); for(auto &j : Q[i]){ ans[j.X.X] += j.X.Y * (query(j.Y.Y) - query(j.Y.X)); } } int res = 0; for(int i = 0 ; i < n ; i++){ if(ans[i] > ans[res]) res = i; } return res; }
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