제출 #1027875

#제출 시각아이디문제언어결과실행 시간메모리
1027875IssaTiles (BOI24_tiles)C++17
30 / 100
33 ms11604 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int, int> pii; typedef pair<ll, ll> pll; #define ent "\n" const int maxn = 1e6 + 100; const ll INF = (ll)1e18 + 100; const int inf = 1e9 + 100; const int MOD = 1e9 + 123; const int maxl = 26; const int P = 31; int n, m; int a[maxn]; int b[maxn]; int c[1010][1010]; vector<int> s; struct asd{ int r, cr; int l, cl; int ok[2]; } d[maxn * 4]; int t[maxn * 4]; void calc(int v, int tl, int tr, int mid){ d[v].ok[0] = d[v<<1].ok[0] & d[v<<1|1].ok[0]; d[v].ok[1] = d[v<<1].ok[1] & d[v<<1|1].ok[1]; if(d[v<<1].l > s[tl] && d[v<<1|1].r < s[tr]){ if(d[v<<1].cl == d[v<<1|1].cr){ d[v].ok[d[v<<1].cl] &= (d[v<<1].l ^ d[v<<1|1].r) & 1; } else{ d[v].ok[d[v<<1].cl] &= (d[v<<1].l ^ s[mid]) & 1; d[v].ok[d[v<<1|1].cr] &= (d[v<<1|1].r ^ s[mid+1]) & 1; } } d[v].r = d[v<<1].r; d[v].cr = d[v<<1].cr; if(d[v<<1|1].cr == d[v].cr && d[v].r == s[mid]) d[v].r = d[v<<1|1].r; d[v].l = d[v<<1|1].l; d[v].cl = d[v<<1|1].cl; if(d[v<<1].cl == d[v].cl && d[v].l == s[mid+1]) d[v].l = d[v<<1].r; } void build(int v = 1, int tl = 0, int tr = s.size() - 1){ if(tl == tr){ d[v] = {s[tl], 0, s[tl], 0, {1, 1}}; } else{ int mid = (tl + tr) >> 1; build(v<<1, tl, mid); build(v<<1|1, mid+1, tr); calc(v, tl, tr, mid); } } void pre(int v){ t[v] ^= 1; d[v].cr ^= 1; d[v].cl ^= 1; swap(d[v].ok[0], d[v].ok[1]); } void push(int v, int tl, int tr){ if(tl == tr || !t[v]) return; t[v] = 0; pre(v<<1); pre(v<<1|1); } void upd(int l, int r, int v = 1, int tl = 0, int tr = s.size()-1){ push(v, tl, tr); if(s[tl] > r || s[tr] < l) return; if(l <= s[tl] && s[tr] <= r) pre(v); else{ int mid = (tl + tr) >> 1; upd(l, r, v<<1, tl, mid); upd(l, r, v<<1|1 ,mid+1, tr); calc(v, tl, tr, mid); } } void out(int v = 1, int tl = 0, int tr = s.size() - 1){ push(v, tl, tr); if(tl == tr) cout << d[v].cl << ' '; else{ int mid = (tl + tr) >> 1; out(v<<1, tl, mid); out(v<<1|1, mid+1, tr); } } void test(){ cin >> n >> m; int mx = 0; bool ok = 1; for(int i = 1; i <= n; i++){ cin >> a[i] >> b[i]; mx = max(mx, b[i]); ok &= (a[i] & 1); } if(ok){ vector<pair<int, pii>> g; for(int i = 1; i <= n; i++){ int j = i - 1; if(!j) j = n; if(a[i] == a[j]){ int l = min(b[i], b[j]); int r = b[i] + b[j] - l; r--; s.push_back(l); s.push_back(r); s.push_back(r+1); s.push_back(l-1); g.push_back({a[i], {l, r}}); } } sort(s.begin(), s.end()); s.resize(unique(s.begin(), s.end()) - s.begin()); build(); int ans = 0; sort(g.begin(), g.end()); for(int i = 0; i < g.size(); i++){ auto [l, r] = g[i].second; upd(l, r); // cout << l << ' ' << r << endl; if(i + 1 < g.size() && g[i].first < g[i+1].first){ // out(); cout << endl; int f = d[1].ok[1]; if(d[1].cr) f &= (d[1].r ^ s[0]) & 1; if(d[1].cl) f &= (d[1].l ^ s.back()) & 1; if(f){ ans = g[i].first + 2; } else break; } } cout << ans; } else if(m > 1000 || mx > 1000){ vector<int> v; for(int i = 2; i <= n; i++){ while(v.size() > 1){ int k = v[v.size()-2], j = v.back(); if(a[k] == a[j] && a[j] == a[i]) v.pop_back(); else if(b[k] == b[j] && b[j] == b[i]) v.pop_back(); else break; } v.push_back(i); } int ans = 0; for(int i: v){ if((b[i] & 1 )|| !b[i]) break; ans = a[i] - (a[i] & 1); if(a[i] & 1) break; } cout << ans; } else{ for(int i = 1; i <= n; i++){ int j = i - 1; if(!j) j = n; if(a[i] == a[j]){ int l = min(b[i], b[j]); int r = b[i] + b[j] - l; for(int y = l; y < r; y++){ c[a[i]][y] ^= 1; } } } for(int i = 0; i < m; i++){ for(int j = 0; j <= 1000; j++){ if(i) c[i][j] ^= c[i-1][j]; } } int ans = 0; for(int i = 0; i < m; i++){ int ok = 0; for(int j = 0; j <= 1000; j++){ if(c[i][j]){ ok = 1; if(c[i+1][j] && c[i][j+1] && c[i+1][j+1]){ c[i][j] = 0; c[i+1][j] = 0; c[i][j+1] = 0; c[i+1][j+1] = 0; } else{ ok = 2; break; } } } if(ok == 2) break; if(ok == 1) continue; ans = i + 1; } cout << ans; } } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int t; t = 1; while(t--) test(); cout << ent; }

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'void test()':
Main.cpp:120:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  120 |   for(int i = 0; i < g.size(); i++){
      |                  ~~^~~~~~~~~~
Main.cpp:124:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |    if(i + 1 < g.size() && g[i].first < g[i+1].first){
      |       ~~~~~~^~~~~~~~~~
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