Submission #307188

#	Time	Username	Problem	Language	Result	Execution time	Memory
307188		rrrr10000	Carnival Tickets (IOI20_tickets)	C++14	53 / 100	3081 ms	53496 KiB

tickets

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n)  for(long long i=0;i<(long long)(n);i++)
#define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
#define all(a) a.begin(),a.end()
#define pb emplace_back
#define eb emplace_back
#define lb(v,k) (lower_bound(all(v),k)-v.begin())
#define ub(v,k) (upper_bound(all(v),k)-v.begin())
#define fi first
#define se second
#define pi M_PI
#define PQ(T) priority_queue<T>
#define SPQ(T) priority_queue<T,vector<T>,greater<T>>
#define dame(a) {out(a);return 0;}
#define decimal cout<<fixed<<setprecision(15);
#define dupli(a) {sort(all(a));a.erase(unique(all(a)),a.end());}
typedef long long ll;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> PP;
typedef tuple<ll,ll,ll,ll> PPP;
typedef multiset<ll> S;
using vi=vector<ll>;
using vvi=vector<vi>;
using vvvi=vector<vvi>;
using vvvvi=vector<vvvi>;
using vp=vector<P>;
using vvp=vector<vp>;
using vb=vector<bool>;
using vvb=vector<vb>;
const ll inf=1001001001001001001;
const ll INF=1001001001;
const ll mod=1000000007;
const double eps=1e-10;
template<class T> bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;}
template<class T> bool chmax(T&a,T b){if(a<b){a=b;return true;}return false;}
template<class T> void out(T a){cout<<a<<'\n';}
template<class T> void outp(T a){cout<<'('<<a.fi<<','<<a.se<<')'<<'\n';}
template<class T> void outvp(T v){rep(i,v.size())cout<<'('<<v[i].fi<<','<<v[i].se<<')';cout<<'\n';}
template<class T> void outvvp(T v){rep(i,v.size())outvp(v[i]);}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<'\n';}
template<class T> void outvv(T v){rep(i,v.size())outv(v[i]);}
template<class T> bool isin(T x,T l,T r){return (l)<=(x)&&(x)<=(r);}
template<class T> void yesno(T b){if(b)out("yes");else out("no");}
template<class T> void YesNo(T b){if(b)out("Yes");else out("No");}
template<class T> void YESNO(T b){if(b)out("YES");else out("NO");}
template<class T> void noyes(T b){if(b)out("no");else out("yes");}
template<class T> void NoYes(T b){if(b)out("No");else out("Yes");}
template<class T> void NOYES(T b){if(b)out("NO");else out("YES");}
void outs(ll a,ll b){if(a>=inf-100)out(b);else out(a);}
ll gcd(ll a,ll b){if(b==0)return a;return gcd(b,a%b);}
ll modpow(ll a,ll b){ll res=1;a%=mod;while(b){if(b&1)res=res*a%mod;a=a*a%mod;b>>=1;}return res;}

#include "tickets.h"
vector<vector<int>> res;
void solve(int k){
    ll n=res.size(),m=res[0].size();
    vp t(n,P(0,k-1));
    vvi id(n);
    rep(i,n)rep(j,m)if(res[i][j]!=-1)id[i].pb(j);
    rep(i,k){
        ll zero=0,one=0;
        rep(j,n)if(res[j][id[j][t[j].fi]]==1)one++;
        rep(j,n){
            if(res[j][id[j][t[j].se]]==0||one==n/2){
                res[j][id[j][t[j].fi++]]=i;
            }
            else{
                if(res[j][id[j][t[j].fi]]==0)one++;
                res[j][id[j][t[j].se--]]=i;
            }
        }
    }
}

long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
    res=vector<vector<int>>(n,vector<int>(m,-1));
    ll ans=0;
    if(n<=300&&m<=300){
        vvi rui(n,vi(k+1));
        ll N=1;
        while(N<n)N*=2;
        rep(i,n){
            rep(j,k)rui[i][0]+=x[i][m-j-1];
            rep(j,k)rui[i][j+1]=rui[i][j]-x[i][j]-x[i][m-k+j];
        }
        vector<vector<PP>> seg(N*2-1);
        rep(i,N){
            if(i<n)rep(j,k+1)seg[i+N-1].pb(rui[i][j],j,j);
            else seg[i+N-1].pb(0,-1,-1);
        }
        for(int i=N-2;i>=0;i--){
            rep(j,seg[i*2+1].size()+seg[i*2+2].size()-1)seg[i].pb(-inf,0,0);
            rep(t,seg[i*2+1].size())rep(j,seg[i*2+2].size()){
                chmax(seg[i][t+j],PP(get<0>(seg[i*2+1][t])+get<0>(seg[i*2+2][j]),t,j));
            }
        }
        ans=get<0>(seg[0][k*n/2]);
        vi memo(2*N-1);
        memo[0]=k*n/2;
        rep(i,N-1){
            memo[i*2+1]=get<1>(seg[i][memo[i]]);
            memo[i*2+2]=get<2>(seg[i][memo[i]]);
        }
        rep(i,n){
            rep(t,memo[i+N-1])res[i][t]=0;
            rep(t,k-memo[i+N-1])res[i][m-t-1]=1;
        }
        solve(k);
    }
    else if(k==m){
	    vector<PP> v;
        rep(i,n)rep(j,m)v.pb(x[i][j],i,j);
        sort(all(v));
        rep(t,n*m){
            ll i,j,a;tie(a,i,j)=v[t];
            if(t<n*m/2){
                ans-=a;
                res[i][j]=0;
            }
            else{
                ans+=a;
                res[i][j]=1;
            }
        }
        solve(k);
    }
    else if(k==1){
        vvp dp(n/2+1,vp(n/2+1,P(-inf,0)));
        dp[0][0]=P(0,0);
        rep(i,n/2+1)rep(j,n/2+1){
            if(i!=n/2)chmax(dp[i+1][j],P(dp[i][j].fi-x[i+j][0],1));
            if(j!=n/2)chmax(dp[i][j+1],P(dp[i][j].fi+x[i+j][m-1],0));
        }
        ans=dp[n/2][n/2].fi;
        ll i=n/2,j=n/2;
        while(i+j){
            if(dp[i][j].se){
                i--;
                res[i+j][0]++;
            }
            else{
                j--;
                res[i+j][m-1]++;
            }
        }
    }
    else{
        vi num(n,m);
        rep(i,n)rep(j,m)if(x[i][j]==1)chmin(num[i],j);
        vp t(n,P(0,m-1));
        rep(i,k){
            vp s(n);
            ll zero=0,one=0;
            rep(j,n)if(x[j][t[j].fi])one++;
            rep(j,n)if(!x[j][t[j].se])zero++;
            if(one>n/2){
                ans+=n-one;
                rep(j,n){
                    if(x[j][t[j].fi])res[j][t[j].se--]=i;
                    else{
                        res[j][t[j].fi++]=i;
                        num[j]--;
                    }
                }
            }
            else if(zero>n/2){
                ans+=n-zero;
                rep(j,n){
                    if(!x[j][t[j].se]){
                        res[j][t[j].fi++]=i;
                        num[j]--;
                    }
                    else res[j][t[j].se--]=i;
                }
            }
            else{
                ans+=n/2;
                vp s(n);
                rep(j,n)s[j]=P(num[j],j);
                sort(all(s));
                rep(j,n){
                    if(x[s[j].se][t[s[j].se].se]==0||one==n/2){
                        res[s[j].se][t[s[j].se].fi++]=i;
                        num[s[j].se]--;
                    }
                    else{
                        if(x[s[j].se][t[s[j].se].fi]==0)one++;
                        res[s[j].se][t[s[j].se].se--]=i;
                    }
                }
            }
        }
    }
    allocate_tickets(res);
    return ans;
}

Compilation message (stderr)

tickets.cpp: In function 'void solve(int)':
tickets.cpp:62:12: warning: unused variable 'zero' [-Wunused-variable]
   62 |         ll zero=0,one=0;
      |            ^~~~

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 14 / 14
• Subtask 4: 0 / 14
• Subtask 5: 12 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10