oj.uz

Submission #359297

# Submission time Handle Problem Language Result Execution time Memory
359297 2021-01-26T16:43:10 Z AmineWeslati Semiexpress (JOI17_semiexpress) C++14
48 / 100
 1000 ms 88172 KB 
//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;
#define int 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 = 3000 + 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,M,K,A,B,C,T;
vi S(MX);
int vis[MX][MX],memo[MX][MX];

int bs(int mx){
	int l=0,r=1e9;
	int x;
	while(l<=r){
		int m=(l+r)/2;
		if(m*A>mx){
			x=m; 
			r=m-1;
		}
		else l=m+1;
	}
	return x;
}

void precompute(){ //vis[i][n]
	FOR(i,0,M-1){
		int l=S[i],r=S[i+1];
		int nb=0,cur=l,ans=0,rest=T-(l-1)*B;
		
		FOR(j,0,K+1) vis[i][j]=0;
		if(rest<0) continue;

		while(rest>0 && cur!=r && nb<K+10){
			int x=bs(rest);

			if(cur+x>r) x=r-cur;
			if(C*x>rest){
				ans+=x-1;
				if(cur==l) vis[i][0]+=x-1;
				break;
			}

			if(cur!=r) vis[i][nb]+=min(r-cur-1,rest/A);

			cur+=x; ans+=x-(cur==r);
			nb+=(cur!=r);
			rest-=C*x;
			vis[i][nb]=ans;

			
		}
		FOR(j,nb+1,K+1) vis[i][j]=vis[i][j-1];
		FOR(j,0,K+1){
			vis[i][j]+=((r-1)*B<=T);
		} 
		dbg(l)
		dbg(vis[i][0])
	}
}

int solve(int i, int r){
	if(i==M-1 || (S[i]-1)*B>T) return 0;
	int &ind=memo[i][r];
	if(ind!=-1) return ind;
	int ans=0;
	FOR(j,0,r+1) ckmax(ans,solve(i+1,r-j)+vis[i][j]);
	return ind=ans;
}

int32_t main() {
    boost; IO();

    cin>>N>>M>>K>>A>>B>>C>>T; K-=M; 
    FOR(i,0,M) cin>>S[i];

    precompute();

    memset(memo,-1,sizeof(memo));
    cout << solve(0,K) << endl;
    

    return 0;
}
//Change your approach

Compilation message

semiexpress.cpp: In function 'll bs(ll)':
semiexpress.cpp:72:9: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   72 |  return x;
      |         ^
semiexpress.cpp: In function 'void precompute()':
semiexpress.cpp:86:10: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   86 |    if(cur+x>r) x=r-cur;
      |       ~~~^~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 71404 KB Output is correct
2 Correct 39 ms 71404 KB Output is correct
3 Correct 39 ms 71660 KB Output is correct
4 Correct 44 ms 71296 KB Output is correct
5 Correct 39 ms 71404 KB Output is correct
6 Correct 41 ms 71404 KB Output is correct
7 Correct 39 ms 71404 KB Output is correct
8 Correct 40 ms 71424 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 71404 KB Output is correct
2 Correct 39 ms 71404 KB Output is correct
3 Correct 39 ms 71660 KB Output is correct
4 Correct 44 ms 71296 KB Output is correct
5 Correct 39 ms 71404 KB Output is correct
6 Correct 41 ms 71404 KB Output is correct
7 Correct 39 ms 71404 KB Output is correct
8 Correct 40 ms 71424 KB Output is correct
9 Correct 39 ms 71296 KB Output is correct
10 Correct 43 ms 71404 KB Output is correct
11 Correct 39 ms 71404 KB Output is correct
12 Correct 39 ms 71404 KB Output is correct
13 Correct 41 ms 71404 KB Output is correct
14 Correct 39 ms 71404 KB Output is correct
15 Correct 39 ms 71424 KB Output is correct
16 Correct 40 ms 71424 KB Output is correct
17 Correct 40 ms 71532 KB Output is correct
18 Correct 40 ms 71404 KB Output is correct

Subtask #3
0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 71404 KB Output is correct
2 Correct 39 ms 71404 KB Output is correct
3 Correct 39 ms 71660 KB Output is correct
4 Correct 44 ms 71296 KB Output is correct
5 Correct 39 ms 71404 KB Output is correct
6 Correct 41 ms 71404 KB Output is correct
7 Correct 39 ms 71404 KB Output is correct
8 Correct 40 ms 71424 KB Output is correct
9 Correct 39 ms 71296 KB Output is correct
10 Correct 43 ms 71404 KB Output is correct
11 Correct 39 ms 71404 KB Output is correct
12 Correct 39 ms 71404 KB Output is correct
13 Correct 41 ms 71404 KB Output is correct
14 Correct 39 ms 71404 KB Output is correct
15 Correct 39 ms 71424 KB Output is correct
16 Correct 40 ms 71424 KB Output is correct
17 Correct 40 ms 71532 KB Output is correct
18 Correct 40 ms 71404 KB Output is correct
19 Correct 168 ms 82284 KB Output is correct
20 Correct 615 ms 88172 KB Output is correct
21 Correct 44 ms 76652 KB Output is correct
22 Correct 50 ms 79100 KB Output is correct
23 Execution timed out 1101 ms 86508 KB Time limit exceeded
24 Halted 0 ms 0 KB -