Submission #539313

#	Time	Username	Problem	Language	Result	Execution time	Memory
539313		mars4	Nafta (COI15_nafta)	C++17	34 / 100	1104 ms	102680 KiB

nafta

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 

using namespace std;
using namespace __gnu_pbds; 

#define ff              first
#define ss              second
#define ll              int64_t
#define ld              long double
#define nl              cout<<"\n"
#define i128            __int128_t
#define all(v)          v.begin(),v.end()
#define mset(a,v)       memset((a),(v),sizeof(a))
#define forn(i,a,b)     for(int64_t i=int64_t(a);i<int64_t(b);++i)
#define forb(i,a,b)     for(int64_t i=int64_t(a);i>=int64_t(b);--i)
#define fastio()        ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

#define mod         1'000'000'007
#define mod2        998'244'353 
#define inf         1'000'000'000'000'007
#define pi          3.14159265358979323846

template<class key,class cmp=std::less<key>>
using ordered_set=tree<key,null_type,cmp,rb_tree_tag,tree_order_statistics_node_update>;

template<class L,class R> ostream& operator<<(ostream& out,pair<L,R> &p)        {return out<<"("<<p.ff<<", "<<p.ss<<")";}
template<class T> ostream& operator<<(ostream& out,vector<T> &v)                {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,deque<T> &v)                 {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,set<T> &s)                   {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class T> ostream& operator<<(ostream& out,ordered_set<T> &s)           {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class L,class R> ostream& operator<<(ostream& out,map<L,R> &m)         {out<<"{";for(auto it=m.begin();it!=m.end();++it){if(it!=m.begin())out<<", ";out<<*it;}return out<<"}";}

void dbg_out() {cerr<<"]\n";}
template<typename Head,typename... Tail> 
void dbg_out(Head H,Tail... T) {cerr<<H;if(sizeof...(Tail))cerr<<", ";dbg_out(T...);}
#ifdef LOCAL
#define dbg(...) cerr<<"["<<#__VA_ARGS__<<"] = [",dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

//---------------------------------mars4---------------------------------

vector<vector<ll>> cnt;
vector<ll> dp1;
vector<ll> dp2;

void calc(ll l,ll r,ll optL,ll optR)
{
	if(l>r)
	{
		return;
	}
	ll mid=(l+r)>>1;
	pair<ll,ll> best={-1,-1};
	forn(i,optL,min(mid,optR)+1)
	{
		ll val=(i?dp1[i-1]+cnt[i-1][mid]:0);
		if(val>best.ff)
		{
			best={val,i};
		}
	}
	dp2[mid]=best.ff;
	ll opt=best.ss;
	calc(l,mid-1,optL,opt);
	calc(mid+1,r,opt,optR);
}

int main()
{
	fastio();
	ll z,n,m,t,k,i,j,l,d,h,r;
	cin>>n>>m;
	vector<string> a(n);
	dp1=vector<ll>(m);
	dp2=vector<ll>(m);
	cnt=vector<vector<ll>>(m,vector<ll>(m));
	for(auto &i:a)
	{
		cin>>i;
	}
	vector<ll> dx={1,0,0,-1};
	vector<ll> dy={0,1,-1,0};
	vector<ll> val(n*m);
	vector<vector<ll>> mark(n,vector<ll>(m,-1));
	ll id=0;
	forn(i,0,n)
	{
		forn(j,0,m)
		{
			if(a[i][j]!='.' and mark[i][j]==-1)
			{
				queue<pair<ll,ll>> q;
				q.push({i,j});
				mark[i][j]=id;
				while(!q.empty())
				{
					auto [r,c]=q.front();
					q.pop();
					val[id]+=(a[r][c]-'0');
					forn(k,0,4)
					{
						ll nr=r+dx[k];
						ll nc=c+dy[k];
						if(nr>=0 and nr<n and nc>=0 and nc<m and a[nr][nc]!='.' and mark[nr][nc]==-1)
						{
							q.push({nr,nc});
							mark[nr][nc]=id;
						}
					}
				}
				id++;
			}
		}
	}
	forn(i2,0,m)
	{
		set<ll> s;
		forn(j,0,n)
		{
			if(mark[j][i2]!=-1)
			{
				s.insert(mark[j][i2]);
			}
		}
		for(ll i:s)
		{
			cnt[i2][i2]+=val[i];
		}
		forn(i1,0,i2)
		{
			cnt[i1][i2]=cnt[i2][i2];
			set<ll> s1;
			forn(j,0,n)
			{
				if(mark[j][i1]!=-1)
				{
					s1.insert(mark[j][i1]);
				}
			}
			for(ll i:s1)
			{
				if(s.count(i))
				{
					cnt[i1][i2]-=val[i];
				}
			}
		}
	}
	forn(i,0,m)
	{
		dp1[i]=cnt[i][i];
	}
	vector<ll> ans;
	ans.push_back(*max_element(all(dp1)));
	forn(i,1,m)
	{
		calc(0,m-1,0,m-1);
		dp1.swap(dp2);
		ans.push_back(*max_element(all(dp1)));
	}
	for(ll i:ans)
	{
		cout<<i<<"\n";
	}
	cerr<<"\nTime elapsed: "<<1000*clock()/CLOCKS_PER_SEC<<"ms\n";
	return 0;
}

Compilation message (stderr)

nafta.cpp: In function 'int main()':
nafta.cpp:75:5: warning: unused variable 'z' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |     ^
nafta.cpp:75:11: warning: unused variable 't' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |           ^
nafta.cpp:75:13: warning: unused variable 'k' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |             ^
nafta.cpp:75:15: warning: unused variable 'i' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |               ^
nafta.cpp:75:17: warning: unused variable 'j' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                 ^
nafta.cpp:75:19: warning: unused variable 'l' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                   ^
nafta.cpp:75:21: warning: unused variable 'd' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                     ^
nafta.cpp:75:23: warning: unused variable 'h' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                       ^
nafta.cpp:75:25: warning: unused variable 'r' [-Wunused-variable]
   75 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                         ^

• Subtask 1: 11 / 11
• Subtask 2: 23 / 23
• Subtask 3: 0 / 66