Submission #404412

#	Time	Username	Problem	Language	Result	Execution time	Memory
404412		AmineWeslati	The short shank; Redemption (BOI21_prison)	C++14	55 / 100	2055 ms	47172 KiB

prison

//Never stop trying
#include "bits/stdc++.h"
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef long long ll;
typedef string str;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)

const int MOD = 1e9 + 7; //998244353
const ll INF = 1e18;
const int MX = 2e6 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up

template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
//constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
ll random(ll a, ll b){
    return a + rng() % (b - a + 1);
}
#ifndef LOCAL  
#define cerr if(false) cerr
#endif
#define dbg(x) cerr << #x << " : " << x << endl; 
#define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
#define here() cerr << "here" << endl;

void IO() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin); 
    freopen("output.txt", "w", stdout);
#endif
}
/////////////////////////ONLY CLEAN CODES ALLOWED/////////////////////////

int N,K,T; 
vpi vec; 

vi t; 
void upd(int i){
	i++;
	for(;i<sz(t); i+=i&-i) t[i]++;
}
int get(int i){
	i++;
	int ans=0;
	for(;i;i-=i&-i){
		ans+=t[i];
	}
	return ans; 
}

int main() {
    boost; IO();

    cin>>N>>K>>T;
    FOR(i,0,N){
    	int t; cin>>t;
    	if(t<=T) vec.eb(i,min(i+T-t,N-1));
    }

    int ans=0;
    vi sum(N+1,0);
    for(auto x: vec){
    	sum[x.fi]++;
    	sum[x.se+1]--;
    }
    int cur=0;
    FOR(i,0,N){
    	cur+=sum[i];
    	if(cur) ans++;
    }

    int rep=K;
    while(K--){
		vi v[N];
		for(auto x: vec){
			int l=x.fi,r=x.se;
			v[r].pb(r);
			if(l) v[l-1].pb(-r);
		}

		vi R(N,-1);
		multiset<int,greater<int>>s;
		ROF(i,0,N){
			for(auto x: v[i]){
				if(x>=0) s.insert(x);
				else s.erase(s.find(-x));
			}
			if(sz(s)) R[i]=*s.begin();
		}

		FOR(i,0,N) v[i].clear();
		for(auto x: vec){
			int l=x.fi,r=x.se;
			v[l].pb(r);
		}

		set<int>free;
		vi val(N,0);
		t.assign(N+1,0);
		ROF(i,0,N){
			if(R[i]!=-1) val[i]=R[i]-i-get(R[i]);

			for(int j: v[i]){
				while(sz(free) && *free.begin()<=j){
					upd(*free.begin());
					free.erase(free.begin());
				}
			} 

			if(!sz(v[i])) free.insert(i);
			else upd(i);
		}

		int idx=0; 
		FOR(i,0,N){
			if(val[i]>val[idx]) idx=i;
		}
		ans-=val[idx];
		for(auto &x: vec){
			int l=x.fi,r=x.se;
			if(idx>=l) ckmin(x.se,idx);
		}

    }
    cout << ans << endl;
    

    return 0;
}
//Change your approach 

Compilation message (stderr)

prison.cpp: In function 'int main()':
prison.cpp:141:15: warning: unused variable 'r' [-Wunused-variable]
  141 |    int l=x.fi,r=x.se;
      |               ^
prison.cpp:93:9: warning: unused variable 'rep' [-Wunused-variable]
   93 |     int rep=K;
      |         ^~~

• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 10 / 10
• Subtask 5: 0 / 25
• Subtask 6: 0 / 20