test/aoj/DPL_3_B.test.cpp

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• Last update: 2020-10-27 12:43:10+09:00
• Problem: http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DPL_3_B

Depends on

• algorithm/largestrectangle.cpp
• tools/chminmax.cpp

Code

// verification-helper: PROBLEM http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DPL_3_B

#include<bits/stdc++.h>
using namespace std;

#define call_from_test
#include "../../tools/chminmax.cpp"
#include "../../algorithm/largestrectangle.cpp"
#undef call_from_test

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  int h,w;
  cin>>h>>w;

  vector< vector<int> > cs(h,vector<int>(w));
  for(int i=0;i<h;i++)
    for(int j=0;j<w;j++)
      cin>>cs[i][j];

  int res=0;
  vector<int> dp(w,0);
  for(int i=0;i<h;i++){
    for(int j=0;j<w;j++)
      dp[j]=cs[i][j]==0?dp[j]+1:0;
    chmax(res,largestrectangle(dp));
  }

  cout<<res<<endl;
  return 0;
}

#line 1 "test/aoj/DPL_3_B.test.cpp"
// verification-helper: PROBLEM http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DPL_3_B

#include<bits/stdc++.h>
using namespace std;

#define call_from_test
#line 1 "tools/chminmax.cpp"

#line 3 "tools/chminmax.cpp"
using namespace std;
#endif
//BEGIN CUT HERE
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
//END CUT HERE
#ifndef call_from_test
signed main(){
  return 0;
}
#endif
#line 1 "algorithm/largestrectangle.cpp"

#line 3 "algorithm/largestrectangle.cpp"
using namespace std;
#endif
//BEGIN CUT HERE
template<typename T>
T largestrectangle(vector<T> &v){
  int n=v.size();
  T res=0;
  using P = pair<int, T>;
  stack<P> sp;
  sp.emplace(-1,T(0));
  for(int i=0;i<n;i++){
    int j=i;
    while(sp.top().second>v[i]){
      j=sp.top().first;
      res=max(res,(i-j)*sp.top().second);
      sp.pop();
    }
    if(sp.top().second<v[i]) sp.emplace(j,v[i]);
  }
  while(!sp.empty()){
    res=max(res,(n-sp.top().first)*sp.top().second);
    sp.pop();
  }
  return res;
}
//END CUT HERE
#ifndef call_from_test
//INSERT ABOVE HERE
signed main(){
  return 0;
}
#endif
#line 9 "test/aoj/DPL_3_B.test.cpp"
#undef call_from_test

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  int h,w;
  cin>>h>>w;

  vector< vector<int> > cs(h,vector<int>(w));
  for(int i=0;i<h;i++)
    for(int j=0;j<w;j++)
      cin>>cs[i][j];

  int res=0;
  vector<int> dp(w,0);
  for(int i=0;i<h;i++){
    for(int j=0;j<w;j++)
      dp[j]=cs[i][j]==0?dp[j]+1:0;
    chmax(res,largestrectangle(dp));
  }

  cout<<res<<endl;
  return 0;
}

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