제출 #1068220

#제출 시각아이디문제언어결과실행 시간메모리
1068220LittleOrangeRectangles (IOI19_rect)C++17
72 / 100
5062 ms264832 KiB
#include "rect.h" #include<bits/stdc++.h> using namespace std; using ll = int; using lll = long long; const ll maxn = 2500; struct BIT{ ll n; vector<ll> a; BIT(ll N):n(N),a(N+1,0){} void add(ll i, ll v){ for(;i<=n;i+=i&-i) a[i] += v; } ll get(ll i){ ll x = 0; for(;i>0;i-=i&-i) x += a[i]; return x; } }; struct dsu{ vector<ll> p; dsu(ll N):p(N,-1){} ll g(ll i){ return p[i]<0?i:p[i] = g(p[i]); } bool m(ll a,ll b){ a = g(a),b = g(b); if (a==b) return false; if (p[a]>p[b]) swap(a,b); p[a] += p[b]; p[b] = a; return true; } }; long long count_rectangles(std::vector<std::vector<int> > a) { ll n = a.size(), m = a[0].size(); if (n<3||m<3) return 0; ll sub6 = 1; for(auto &o : a) for(ll &i : o) if (i>1) sub6 = 0; if (0&&sub6){ dsu d(n*m); for(ll i = 1;i<n-1;i++){ for(ll j = 1;j<m-1;j++){ if(i>1&&!a[i][j]&&!a[i-1][j]){ d.m((i)*m+(j),(i-1)*m+(j)); } if(j>1&&!a[i][j]&&!a[i][j-1]){ d.m((i)*m+(j),(i)*m+(j-1)); } } } vector<ll> gs; for(ll i = 1;i<n-1;i++){ for(ll j = 1;j<m-1;j++){ if(!a[i][j]){ gs.push_back(d.g((i)*m+(j))); } } } sort(gs.begin(),gs.end()); gs.erase(unique(gs.begin(),gs.end()),gs.end()); ll gc = gs.size(); vector<vector<pair<ll,ll>>> ps(gc); for(ll i = 1;i<n-1;i++){ for(ll j = 1;j<m-1;j++){ if(!a[i][j]){ ll p = d.g((i)*m+(j)); ll idx = lower_bound(gs.begin(),gs.end(),p)-gs.begin(); ps[idx].push_back({i,j}); } } } ll ans = 0; for(auto &o : ps){ ll x1 = o[0].first, x2=o[0].first, y1=o[0].second, y2=o[0].second; for(auto [x,y] : o){ x1 = min(x,x1); x2 = max(x,x2); y1 = min(y,y1); y2 = max(y,y2); } ll req = (x2-x1+1)*(y2-y1+1); if (req==o.size()) ans++; } return ans; } vector<vector<pair<ll,ll>>> row(n),col(m); for(ll i = 0;i<n;i++){ vector<pair<ll,ll>> st; for(ll j = 0;j<m;j++){ while(st.size()&&st.back().first<a[i][j]){ if(j>st.back().second+1)row[i].push_back({st.back().second,j}); st.pop_back(); } if(st.size()){ if(j>st.back().second+1)row[i].push_back({st.back().second,j}); } if (st.size()&&st.back().first==a[i][j]) st.pop_back(); st.push_back({a[i][j],j}); } } for(ll j = 0;j<m;j++){ vector<pair<ll,ll>> st; for(ll i = 0;i<n;i++){ while(st.size()&&st.back().first<a[i][j]){ if(i>st.back().second+1)col[j].push_back({st.back().second,i}); st.pop_back(); } if(st.size()){ if(i>st.back().second+1)col[j].push_back({st.back().second,i}); } if (st.size()&&st.back().first==a[i][j]) st.pop_back(); st.push_back({a[i][j],i}); } } for(auto &o : row) sort(o.begin(),o.end()); for(auto &o : col) sort(o.begin(),o.end()); vector<vector<ll>> down(n,vector<ll>(m,0)),up(n,vector<ll>(m,n)); for(ll i = 0;i<m;i++){ for(auto [l,r] : col[i]){ down[l][i] = r; up[l][i] = min(up[l][i],r); } } lll ans = 0; for(ll r1 = 1;r1<n-1;r1++){ vector<pair<ll,ll>> cur = row[r1]; vector<pair<ll,ll>> nw; BIT t(m); vector<vector<pair<ll,ll>>> ops(n); BIT t0(m); vector<vector<pair<ll,ll>>> ops0(n); if (1||sub6) for(ll i = 0;i<m;i++) { ops[max(up[r1-1][i]-1,r1)].push_back({i+1,1}); ops[down[r1-1][i]].push_back({i+1,-1}); auto itl = lower_bound(col[i].begin(),col[i].end(),make_pair(r1-1,r1+1)); auto itr = lower_bound(col[i].begin(),col[i].end(),make_pair(r1,0)); for(auto it = itl;it!=itr;it++){ ll r = (*it).second; ops0[r-1].push_back({i+1,1}); ops0[r].push_back({i+1,-1}); } } for(ll r2 = r1;r2<n-1;r2++){ if (1||sub6) for(auto [i,v] : ops[r2]){ t.add(i,v); } if (1||sub6) for(auto [i,v] : ops0[r2]){ t0.add(i,v); } if(r2>r1){ for(auto &o : cur){ if (binary_search(row[r2].begin(),row[r2].end(),o)){ nw.push_back(o); } } nw.swap(cur); nw.clear(); } if (1||sub6){ for(auto &o : cur){ if (t.get(o.second)-t.get(o.first+1)==(o.second-o.first-1)&& t0.get(o.second)-t0.get(o.first+1)==(o.second-o.first-1)) ans++; } }else{ pair<ll,ll> t = {r1-1,r2+1}; vector<ll> ok(m,0); for(ll i = 0;i<m;i++) ok[i] = down[r1-1][i]>r2&&up[r1-1][i]-1<=r2&&binary_search(col[i].begin(),col[i].end(),t); vector<ll> p(m+1,0); for(ll i = 0;i<m;i++) p[i+1] = p[i]+ok[i]; for(auto &o : cur){ if (p[o.second]-p[o.first+1]==(o.second-o.first-1)) ans++; } } } } return ans; }

컴파일 시 표준 에러 (stderr) 메시지

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:84:11: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |    if (req==o.size()) ans++;
      |        ~~~^~~~~~~~~~
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