Submission #412152

#TimeUsernameProblemLanguageResultExecution timeMemory
412152ritul_kr_singhBubble Sort 2 (JOI18_bubblesort2)C++17
100 / 100
1832 ms61176 KiB
#include <bits/stdc++.h> using namespace std; #define ll long long #define sp << ' ' << #define nl << '\n' #include "bubblesort2.h" struct FenwickTree{ vector<int> a; int n, s; FenwickTree(int N){ a.resize((n=N)+1); } void add(int i, int v){ for(++i; i<=n; i+=i&-i) a[i] += v; } int get(int i){ for(s=0; i>=1; i-=i&-i) s += a[i]; return s; } int get(int l, int r){ return get(r+1) - get(l); } int lower(int v){ int i = 0; for(s=1<<20; s; s/=2) if(i+s<=n && a[i+s]<v) v -= a[i+=s]; return i; } }; const int INF = 1e7; struct SegmentTree{ vector<int> a, b; int sz = 1; const int ID = -INF; SegmentTree(vector<int> &v){ while(sz < (int)v.size()) sz += sz; a.assign(2*sz, ID); b.resize(2*sz); build(v, 0, 0, sz); } void build(vector<int> &v, int x, int lx, int rx){ if(rx-lx==1){ if(lx < (int)v.size()) a[x] = v[lx]; return; } int mx = (lx + rx) / 2; build(v, 2*x+1, lx, mx); build(v, 2*x+2, mx, rx); a[x] = max(a[2*x+1], a[2*x+2]); } void update(int i, int v, int x, int lx, int rx){ if(rx-lx==1) return void(a[x] = v); int mx = (lx + rx) / 2; v -= b[x]; if(i < mx) update(i, v, 2*x+1, lx, mx); else update(i, v, 2*x+2, mx, rx); a[x] = b[x] + max(a[2*x+1], a[2*x+2]); } void update(int i, int v){ update(i, v, 0, 0, sz); } void rangeAdd(int l, int r, int v, int x, int lx, int rx){ if(r<=lx || rx<=l) return; if(l<=lx && rx<=r){ a[x] += v; b[x] += v; return; } int mx = (lx + rx) / 2; rangeAdd(l, r, v, 2*x+1, lx, mx); rangeAdd(l, r, v, 2*x+2, mx, rx); a[x] = b[x] + max(a[2*x+1], a[2*x+2]); } void rangeAdd(int l, int r, int v){ rangeAdd(l, r+1, v, 0, 0, sz); } int query(){ return a[0]; } }; vector<int> countScans(vector<int> A, vector<int> X, vector<int> V){ vector<array<int, 2>> p(A.size()+X.size()); for(int i=0; i<(int)A.size(); ++i) p[i] = {A[i], i}; for(int i=0; i<(int)X.size(); ++i) p[i+A.size()] = {V[i], X[i]}; sort(p.begin(), p.end()); vector<int> seg(p.size(), -INF), pos(A.size()), res(X.size()); FenwickTree f(p.size()); for(int i=0; i<(int)A.size(); ++i){ array<int, 2> search = {A[i], i}; pos[i] = lower_bound(p.begin(), p.end(), search) - p.begin(); f.add(pos[i], 1); } for(int i=0; i<(int)A.size(); ++i) seg[pos[i]] = i - f.get(0, pos[i] - 1); SegmentTree st(seg); for(int i=0; i<(int)X.size(); ++i){ array<int, 2> search = {V[i], X[i]}; int j = lower_bound(p.begin(), p.end(), search) - p.begin(); if(pos[X[i]] < j) st.rangeAdd(pos[X[i]], j, 1); else st.rangeAdd(j, pos[X[i]], -1); f.add(pos[X[i]], -1); f.add(j, 1); st.update(pos[X[i]], st.ID); st.update(pos[X[i]] = j, X[i] - f.get(0, j-1)); res[i] = st.query(); } return res; }
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