제출 #1027801

#제출 시각아이디문제언어결과실행 시간메모리
1027801IssaTiles (BOI24_tiles)C++17
19 / 100
41 ms26652 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]; void test(){ cin >> n >> m; bool ok = 1; for(int i = 1; i <= n; i++){ cin >> a[i] >> b[i]; if(i > 2) ok &= (a[i] >= a[i-1]) & (b[i] >= b[i-1]); } if(ok && !a[1] && !b[1]){ 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; }
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