Submission #672027

#TimeUsernameProblemLanguageResultExecution timeMemory
672027amunduzbaevCultivation (JOI17_cultivation)C++17
0 / 100
7 ms468 KiB
#include "bits/stdc++.h" using namespace std; #define ar array typedef long long ll; //~ #define int ll signed main(){ ios::sync_with_stdio(0); cin.tie(0); int n, m; cin >> n >> m; int sz; cin >> sz; vector<int> x(sz), y(sz), t; for(int i=0;i<sz;i++){ cin >> x[i] >> y[i]; } t = x; sort(t.begin(), t.end()); t.erase(unique(t.begin(), t.end()), t.end()); vector<int> cnt(t.size()); vector<int> id(sz); for(int i=0;i<sz;i++){ id[i] = lower_bound(t.begin(), t.end(), x[i]) - t.begin() + 1; } vector<ar<int, 2>> tot; vector<int> v, is; vector<ar<int, 3>> Mn; set<int> mn, used; int res = 2 * (n + m); auto check = [&](int d){ tot.clear(); v.clear(), is.clear(), Mn.clear(); for(int i=0;i<sz;i++){ //~ cout<<max(1LL, y[i] - w)<<" "<<min(y[i] + e, m)<<"\n"; tot.push_back({y[i], id[i]}); tot.push_back({y[i] + d + 1, -id[i]}); } sort(tot.begin(), tot.end()); mn.insert(0); auto add = [&](int x){ if(used.empty()){ used.insert(x); return; } auto it = used.upper_bound(x); if(it == used.begin()){ mn.insert(*it - x - 1); used.insert(x); return; } if(it == used.end()){ it--; mn.insert(x - *it - 1); used.insert(x); return; } auto l = it; l--; mn.erase(*it - *l - 1); mn.insert(*it - x - 1); mn.insert(x - *l - 1); used.insert(x); }; auto del = [&](int x){ used.erase(x); if(used.empty()) return; auto it = used.upper_bound(x); if(it == used.begin()){ mn.erase(*it - x - 1); return; } if(it == used.end()){ it--; mn.erase(x - *it - 1); return; } auto l = it; l--; mn.erase(*it - x - 1); mn.erase(x - *l - 1); mn.insert(*it - *l - 1); }; for(int i=0;i<(int)tot.size();){ int j = i; while(j < (int)tot.size() && tot[j][0] == tot[i][0]){ if(tot[j][1] > 0){ if(!cnt[tot[j][1] - 1]) add(t[tot[j][1] - 1]); cnt[tot[j][1] - 1]++; } else{ cnt[-tot[j][1] - 1]--; if(!cnt[-tot[j][1] - 1]) del(t[-tot[j][1] - 1]); } j++; } v.push_back(tot[i][0]); if(used.empty()){ Mn.push_back({0, 0, 0}); is.push_back(1); } else { assert(!mn.empty()); Mn.push_back({*used.begin() - 1, n - *--used.end(), *--mn.end()}); is.push_back(0); } i = j; } { multiset<int> mnl, mnr, mn; int r = 0, cnt = 0; for(int i=0;i + 1 < (int)v.size();i++){ while(r < (int)v.size() && v[r] - v[i] < m){ mn.insert(Mn[r][2]); mnl.insert(Mn[r][0]); mnr.insert(Mn[r][1]); cnt += is[r]; r++; } if(cnt == 0){ res = min(res, d + max(*--mn.end(), *--mnl.end() + *--mnr.end())); } mn.erase(mn.find(Mn[i][2])); mnl.erase(mnl.find(Mn[i][0])); mnr.erase(mnr.find(Mn[i][1])); cnt -= is[i]; } } }; for(int i=0;i<sz;i++){ for(int j=0;j<sz;j++){ check(y[i] - 1 + m - y[j]); } for(int k=0;k<sz;k++){ if(y[i] >= y[k]) continue; check(y[k] - y[i] - 1); } } cout<<res<<"\n"; }
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