Submission #929074

#	Time	Username	Problem	Language	Result	Execution time	Memory
929074		GrindMachine	Teams (IOI15_teams)	C++17	100 / 100	887 ms	249272 KiB

teams

#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;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi

*/

const int MOD = 1e9 + 7;
const int N = 5e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "teams.h"

struct wavelet_tree{
    struct node{
        node *l, *r;
        vector<int> b;
    };
 
    node* root;
    int siz;
 
    wavelet_tree(){
 
    }
 
    node* build(vector<int> &a, vector<int> inds, int l, int r){
        if(l > r) return NULL;
        int mid = (l+r) >> 1;
        vector<int> b(sz(inds)+1);
 
        vector<int> la,ra;
        rep(i,sz(inds)){
            int x = a[inds[i]];
            b[i+1] = b[i]+(x <= mid);
            if(x <= mid){
                la.pb(inds[i]);
            }
            else{
                ra.pb(inds[i]);
            }
        }
 
        node* curr = new node();
        curr->b = b;
 
        if(l != r){         
            curr->l = build(a,la,l,mid);
            curr->r = build(a,ra,mid+1,r);
        }
 
        return curr;
    }
 
    void build(vector<int> &a, int mx_siz){
        siz = mx_siz;
        vector<int> inds;
        rep(i,sz(a)) inds.pb(i);
        root = build(a,inds,0,siz);
    }

    int get_cnt(node* u, int lx, int rx, int l, int r, int vl, int vr){
        if(!u) return 0;
        if(l > r) return 0;
        if(lx > vr or rx < vl) return 0;
        if(lx >= vl and rx <= vr) return r-l+1;

        int mid = (lx+rx) >> 1;

        auto &b = u->b;

        int res = 0;
        res += get_cnt(u->l,lx,mid,b[l-1]+1,b[r],vl,vr);
        res += get_cnt(u->r,mid+1,rx,l-b[l-1],r-b[r],vl,vr);
        
        return res;
    }

    int get_cnt(int l, int r, int vl, int vr){
        return get_cnt(root,0,siz,l+1,r+1,vl,vr);
    }
};

int n;
vector<pii> a;
wavelet_tree wt;
vector<int> lb;

void init(int n_, int A[], int B[]) {
    n = n_;
    rep(i,n) a.pb({A[i],B[i]});
    sort(all(a));

    lb = vector<int>(n+5,n);
    rep(i,n) amin(lb[a[i].ff],i);
    rev(i,n,0) amin(lb[i],lb[i+1]);

    vector<int> b;
    rep(i,n) b.pb(a[i].ss);

    wt.build(b,n+1);
}

int can(int m, int K[]) {
    int sum = 0;
    rep(i,m){
        sum += K[i];
        if(sum > n){
            return 0;
        }
    }

    sort(K,K+m);
    vector<pii> c;
    c.pb({K[0],K[0]});
    rep1(i,m-1){
        if(K[i] == K[i-1]){
            c.back().ss += K[i];
        }
        else{
            c.pb({K[i],K[i]});
        }
    }

    auto get = [&](int mnl, int mxl, int mnr){
        return wt.get_cnt(lb[mnl],lb[mxl+1]-1,mnr,n);
    };

    c.insert(c.begin(),{0,0});
    m = sz(c);
    set<int> st;
    st.insert(0);

    vector<int> leave[m];

    vector<int> dp(m,inf1);
    dp[0] = 0;

    // auto odp = dp;

    rep1(i,m-1){
        while(!leave[i].empty()){
            ll j = leave[i].back();
            leave[i].pop_back();
            if(!st.count(j)) conts;            
            st.erase(j);

            auto it = st.upper_bound(j);
            if(it != st.end() and it != st.begin()){
                int x = *prev(it), y = *it;
                int val = dp[y]-dp[x];
                int lo = i, hi = m-1;
                int pos = -1;

                while(lo <= hi){
                    int mid = (lo+hi) >> 1;
                    if(val >= get(c[x].ff+1,c[y].ff,c[mid].ff)){
                        pos = mid;
                        hi = mid-1;
                    }
                    else{
                        lo = mid+1;
                    }
                }

                if(pos != -1){
                    leave[pos].pb(y);
                }
            }
        }

        {
            int j = *st.rbegin();
            dp[i] = dp[j]+get(c[j].ff+1,c[i].ff,c[i].ff)-c[i].ss;
        }

        st.insert(i);
        auto it = st.find(i);

        {
            int x = *prev(it), y = *it;
            int val = dp[y]-dp[x];
            int lo = i+1, hi = m-1;
            int pos = -1;

            while(lo <= hi){
                int mid = (lo+hi) >> 1;
                if(val >= get(c[x].ff+1,c[y].ff,c[mid].ff)){
                    pos = mid;
                    hi = mid-1;
                }
                else{
                    lo = mid+1;
                }
            }

            if(pos != -1){
                leave[pos].pb(y);
            }
        }

        // rep(j,i){
        //     amin(odp[i],odp[j]+get(c[j].ff+1,c[i].ff,c[i].ff));
        // }
        // odp[i] -= c[i].ss;
    }

    // debug(dp);
    // debug(odp);
    // assert(dp == odp);

    int mn = *min_element(all(dp));
    return mn >= 0;
}

Compilation message (stderr)

teams.cpp: In function 'int can(int, int*)':
teams.cpp:194:26: warning: conversion from 'll' {aka 'long long int'} to 'std::set<int>::key_type' {aka 'int'} may change value [-Wconversion]
  194 |             if(!st.count(j)) conts;
      |                          ^
teams.cpp:195:22: warning: conversion from 'll' {aka 'long long int'} to 'std::set<int>::key_type' {aka 'int'} may change value [-Wconversion]
  195 |             st.erase(j);
      |                      ^
teams.cpp:197:38: warning: conversion from 'll' {aka 'long long int'} to 'std::set<int>::key_type' {aka 'int'} may change value [-Wconversion]
  197 |             auto it = st.upper_bound(j);
      |                                      ^

• Subtask 1: 21 / 21
• Subtask 2: 13 / 13
• Subtask 3: 43 / 43
• Subtask 4: 23 / 23