제출 #835608

#제출 시각아이디문제언어결과실행 시간메모리
835608mousebeaverSeats (IOI18_seats)C++14
37 / 100
4040 ms80808 KiB
#include "seats.h" #include <bits/stdc++.h> #define pii pair<int, int> #define INF numeric_limits<int>::max()/2 using namespace std; struct inf { int r1; int r2; int c1; int c2; bool possible; }; inf combine(inf a, inf b) { return {min(a.r1, b.r1), max(a.r2, b.r2), min(a.c1, b.c1), max(a.c2, b.c2)}; } int area(inf dat) { return ((1+dat.r2-dat.r1)*(1+dat.c2-dat.c1)); } int left(int i) { return 2*i; } int right(int i) { return 2*i+1; } int par(int i) { return i/2; } inf query(int i, vector<inf>& s, int a, int b, int l, int r) { if(l <= a && b <= r) { return s[i]; } if(r < a || b < l) { return {INF, 0, INF, 0}; } int mid = (a+b)/2; inf q1 = query(left(i), s, a, mid, l, r); inf q2 = query(right(i), s, mid+1, b, l, r); return {min(q1.r1, q2.r1), max(q1.r2, q2.r2), min(q1.c1, q2.c1), max(q1.c2, q2.c2)}; } void update(int i, vector<inf>& s, inf val) { s[i] = val; i = par(i); while(i > 0) { s[i] = {min(s[left(i)].r1, s[right(i)].r1), max(s[left(i)].r2, s[right(i)].r2), min(s[left(i)].c1, s[right(i)].c1), max(s[left(i)].c2, s[right(i)].c2)}; i = par(i); } } vector<inf> s(0); vector<pii> p(0); vector<inf> a(0); int segnodes = 1; int counter = 1; int n = 1; bool sub3 = false; void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) { if(H <= 1000 && W <= 1000) { sub3 = true; } if(sub3) { n = H*W; while(2*n > segnodes) { segnodes *= 2; } s.assign(segnodes, {INF, 0, INF, 0}); p.assign(n, {-1, -1}); for(int i = 0; i < n; i++) { s[i+segnodes/2] = {R[i], R[i], C[i], C[i]}; p[i] = {R[i], C[i]}; } for(int i = segnodes/2-1; i > 0; i--) { s[i] = {min(s[left(i)].r1, s[right(i)].r1), max(s[left(i)].r2, s[right(i)].r2), min(s[left(i)].c1, s[right(i)].c1), max(s[left(i)].c2, s[right(i)].c2)}; } } else { n = H*W; for(int i = 0; i < n; i++) { p.push_back({R[i], C[i]}); } a = {{p[0].first, p[0].first, p[0].second, p[0].second, true}}; for(int i = 1; i < n; i++) { a.push_back(a.back()); a.back().r1 = min(a.back().r1, p[i].first); a.back().r2 = max(a.back().r2, p[i].first); a.back().c1 = min(a.back().c1, p[i].second); a.back().c2 = max(a.back().c2, p[i].second); a.back().possible = ((1+a.back().r2-a.back().r1)*(1+a.back().c2-a.back().c1) == i+1); counter += a.back().possible; } } } int swap_seats(int d, int b) { if(sub3) { swap(p[d], p[b]); update(segnodes/2+d, s, {p[d].first, p[d].first, p[d].second, p[d].second}); update(segnodes/2+b, s, {p[b].first, p[b].first, p[b].second, p[b].second}); int output = 1; int ar = 1; while(ar < n) { int i = segnodes/2; inf dat = s[i]; while(area(dat) <= ar) { i = par(i); dat = s[i]; } dat = s[left(i)]; i = right(i); //Now, we are in the lowest node that contains enough area! => Going back down while(left(i) < segnodes) { if(area(combine(s[left(i)], dat)) > ar) { i = left(i); } else { dat = combine(dat, s[left(i)]); i = right(i); } } dat = combine(dat, s[i]); ar = area(dat); output += (ar == area(query(1, s, 1, segnodes/2, 1, ar))); } return output; } else { if(d > b) { swap(d, b); } swap(p[d], p[b]); for(int i = d; i <= b; i++) { counter -= a[i].possible; if(i == 0) { a[i] = {p[0].first, p[0].first, p[0].second, p[0].second, true}; } else { a[i] = a[i-1]; } a[i].r1 = min(a[i].r1, p[i].first); a[i].r2 = max(a[i].r2, p[i].first); a[i].c1 = min(a[i].c1, p[i].second); a[i].c2 = max(a[i].c2, p[i].second); a[i].possible = ((1+a[i].r2-a[i].r1)*(1+a[i].c2-a[i].c1) == i+1); counter += a[i].possible; } return counter; } }
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