Editorial for Hang động


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Lưu ý: Các code mẫu dưới đây chỉ mang tính tham khảo và có thể không AC được bài tập này

Code mẫu của flashmt

#include <iostream>
#include <cstdio>
using namespace std;

int n,h,a[500500];

int main()
{
    int x;
    cin >> n >> h;
    for (int i=1;i<=n;i++)
    {
        scanf("%d",&x);
        if (i%2) a[1]++, a[x+1]--;
        else a[h-x+1]++;
    }

    int ans=n+1,cnt;
    for (int i=1;i<=h;i++)
    {
        a[i]+=a[i-1];
        if (a[i]<ans) ans=a[i], cnt=1;
        else cnt+=(a[i]==ans);
    }
    cout << ans << ' ' << cnt << endl;
}

Code mẫu của happyboy99x

#include<cstdio>
#include<algorithm>
using namespace std;

int c[2][100000], cnt[100001], n, h;

int main() {
    scanf("%d%d",&n,&h);
    for(int i = 0; i < n; ++i) scanf("%d", &c[i%2][i/2]);
    n /= 2; sort(c[0], c[0]+n); sort(c[1], c[1]+n);
    int mn = (int) 1e9; 
    for(int i = 1; i <= h; ++i) {
        int t = n - (upper_bound(c[0], c[0]+n, i-1) - c[0]);
        t += n - (upper_bound(c[1], c[1]+n, h-i) - c[1]);
        ++cnt[t];
        mn = min(mn, t);
    }
    printf("%d %d\n", mn, cnt[mn]);
    return 0;
}

Code mẫu của ladpro98

program c11cave;
uses    math;
const   fi='';
        up=0;down=1;
        maxN=500005;
var     a:array[up..down,0..maxN] of longint;
        f1,f2:array[1..maxN] of longint;
        n,h,res,c:longint;

procedure input;
var     f:text;
        i:longint;
begin
        assign(f,fi);
        reset(f);
        readln(f,n,h);
        for i:=1 to n do
        begin
                if odd(i) then readln(f,a[down,i div 2 +1])
                else readln(f,a[up,i div 2]);
        end;
        close(f);
end;

procedure swap(k,i,j:longint);
var     t:longint;
begin
        t:=a[k,i];
        a[k,i]:=a[k,j];
        a[k,j]:=t;
end;

procedure sort(k,l,r:longint);
var     p,i,j:longint;
begin
        if l>=r then exit;
        p:=a[k,random(r-l+1)+l];
        i:=l;j:=r;
        repeat
                while a[k,i]<p do inc(i);
                while a[k,j]>p do dec(j);
                if i<=j then
                begin
                        if i<j then swap(k,i,j);
                        inc(i);dec(j);
                end;
        until i>j;
        sort(k,l,j);sort(k,i,r);
end;

procedure process;
var     i,j:longint;
begin
        j:=1;
        for i:=1 to H do
        begin
                while (j<=N div 2) and (a[down,j]<i) do inc(j);
                f1[i]:=n div 2-j+1;
        end;
        j:=1;
        for i:=H downto 1 do
        begin
                while (j<=N div 2) and (a[up,j]<(H-i+1)) do inc(j);
                f2[i]:=n div 2-j+1;
        end;
        res:=maxN;
        for i:=1 to H do res:=min(res,f1[i]+f2[i]);
        for i:=1 to H do if (f1[i]+f2[i]=res) then inc(c);
end;

begin
        input;
        sort(up,1,n div 2);
        sort(down,1,n div 2);
        process;
        write(res,' ',c);
end.

Code mẫu của RR

#include <sstream>
#include <iomanip>
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <string>
#include <deque>
#include <complex>

#define FOR(i,a,b) for(int i=(a),_b=(b); i<=_b; i++)
#define FORD(i,a,b) for(int i=(a),_b=(b); i>=_b; i--)
#define REP(i,a) for(int i=0,_a=(a); i<_a; i++)
#define FORN(i,a,b) for(int i=(a),_b=(b);i<_b;i++)
#define DOWN(i,a,b) for(int i=a,_b=(b);i>=_b;i--)
#define SET(a,v) memset(a,v,sizeof(a))
#define sqr(x) ((x)*(x))
#define ll long long
#define F first
#define S second
#define PB push_back
#define MP make_pair

#define DEBUG(x) cout << #x << " = "; cout << x << endl;
#define PR(a,n) cout << #a << " = "; FOR(_,1,n) cout << a[_] << ' '; cout << endl;
#define PR0(a,n) cout << #a << " = "; REP(_,n) cout << a[_] << ' '; cout << endl;
using namespace std;

//Buffer reading
int INP,AM,REACHEOF;
#define BUFSIZE (1<<12)
char BUF[BUFSIZE+1], *inp=BUF;
#define GETCHAR(INP) { \
    if(!*inp) { \
        if (REACHEOF) return 0;\
        memset(BUF,0,sizeof BUF);\
        int inpzzz = fread(BUF,1,BUFSIZE,stdin);\
        if (inpzzz != BUFSIZE) REACHEOF = true;\
        inp=BUF; \
    } \
    INP=*inp++; \
}
#define DIG(a) (((a)>='0')&&((a)<='9'))
#define GN(j) { \
    AM=0;\
    GETCHAR(INP); while(!DIG(INP) && INP!='-') GETCHAR(INP);\
    if (INP=='-') {AM=1;GETCHAR(INP);} \
    j=INP-'0'; GETCHAR(INP); \
    while(DIG(INP)){j=10*j+(INP-'0');GETCHAR(INP);} \
    if (AM) j=-j;\
}
//End of buffer reading

const long double PI = acos((long double) -1.0);

const int MN = 200111;

int na, nb, a[MN], b[MN];

int main() {
    int n, h;
    while (scanf("%d%d", & n, &h) == 2) {
        int x;
        na = nb = 0;
        FOR(i,1,n) {
            scanf("%d", &x);
            if (i % 2 == 1) a[++na] = x;
            else b[++nb] = h+1 - x;
        }
        sort(a+1, a+na+1);
        sort(b+1, b+nb+1);
        a[na+1] = b[nb+1] = 1000111000;

        int res = n+1, cnt = 0;
        FOR(i,1,h) {
            int cur = na - (lower_bound(a+1, a+na+2, i) - a) + 1;
            cur += lower_bound(b+1, b+nb+2, i+1) - b - 1;
            if (cur < res) {
                res = cur;
                cnt = 1;
            }
            else if (cur == res)
                ++cnt;
        }
        printf("%d %d\n", res, cnt);
    }
    return 0;
}

Code mẫu của hieult

#include <set>
#include <map>
#include <list>
#include <cmath>
#include <queue>
#include <stack>
#include <cstdio>
#include <string>
#include <vector>
#include <cstdlib>
#include <cstring>
#include <sstream>
#include <iomanip>
#include <iostream>
#include <algorithm>
#include <ctime>
#include <deque>
#include <bitset>
#include <cctype>
#include <utility>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef unsigned int ui;
typedef unsigned long long ull;

#define Rep(i,n) for(int i = 0; i < (n); ++i)
#define Repd(i,n) for(int i = (n)-1; i >= 0; --i)
#define For(i,a,b) for(int i = (a); i <= (b); ++i)
#define Ford(i,a,b) for(int i = (a); i >= (b); --i)
#define Fit(i,v) for(__typeof((v).begin()) i = (v).begin(); i != (v).end(); ++i)
#define Fitd(i,v) for(__typeof((v).rbegin()) i = (v).rbegin(); i != (v).rend(); ++i)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define sz(a) ((int)(a).size())
#define all(a) (a).begin(), (a).end()
#define ms(a,x) memset(a, x, sizeof(a))

template<class F, class T> T convert(F a, int p = -1) {
    stringstream ss;
    if (p >= 0)
        ss << fixed << setprecision(p);
    ss << a;
    T r;
    ss >> r;
    return r;
}
template<class T> T gcd(T a, T b) {
    T r;
    while (b != 0) {
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}
template<class T> T lcm(T a, T b) {
    return a / gcd(a, b) * b;
}
template<class T> T sqr(T x) {
    return x * x;
}
template<class T> T cube(T x) {
    return x * x * x;
}
template<class T> int getbit(T s, int i) {
    return (s >> i) & 1;
}
template<class T> T onbit(T s, int i) {
    return s | (T(1) << i);
}
template<class T> T offbit(T s, int i) {
    return s & (~(T(1) << i));
}
template<class T> int cntbit(T s) {
    return s == 0 ? 0 : cntbit(s >> 1) + (s & 1);
}

const int bfsz = 1 << 16;
char bf[bfsz + 5];
int rsz = 0;
int ptr = 0;
char gc() {
    if (rsz <= 0) {
        ptr = 0;
        rsz = (int) fread(bf, 1, bfsz, stdin);
        if (rsz <= 0)
            return EOF;
    }
    --rsz;
    return bf[ptr++];
}
void ga(char &c) {
    c = EOF;
    while (!isalpha(c))
        c = gc();
}
int gs(char s[]) {
    int l = 0;
    char c = gc();
    while (isspace(c))
        c = gc();
    while (c != EOF && !isspace(c)) {
        s[l++] = c;
        c = gc();
    }
    s[l] = '\0';
    return l;
}
template<class T> bool gi(T &v) {
    v = 0;
    char c = gc();
    while (c != EOF && c != '-' && !isdigit(c))
        c = gc();
    if (c == EOF)
        return false;
    bool neg = c == '-';
    if (neg)
        c = gc();
    while (isdigit(c)) {
        v = v * 10 + c - '0';
        c = gc();
    }
    if (neg)
        v = -v;
    return true;
}

typedef pair<int, int> II;
const ld PI = acos(-1.0);
const ld eps = 1e-9;
const int dr[] = { 0, -1, -1, -1 };
const int dc[] = { -1, -1, 0, +1 };
const int inf = (int) 1e9 + 5;
const ll linf = (ll) 1e16 + 5;
const ll mod = (ll) 1e9 + 7;
const int maxn = 100 + 5;
#define ok puts("ok")

#define maxn 1000005

int n, h, x;
int ra[maxn], vao[maxn];

int main() {
//  freopen("in.txt", "r", stdin);

    cin >> n >> h;
    ms(ra, 0);
    ms(vao, 0);
    For(i, 1, n){
        scanf("%d", &x);
        if(i & 1){
            ra[x + 1]++;
        }
        else {
            vao[h - x + 1]++;
        }
    }

    int num = (n + 1) >> 1, so = 1;
    int MIN = num;
    For(i, 2, h){
        num -= ra[i];
        num += vao[i];
        if(MIN > num){
            MIN = num;
            so = 1;
        }
        else if(MIN == num){
            so++;
        }
    }

    cout << MIN << " " << so;

    return 0;
}

Code mẫu của skyvn97

#include<stdio.h>
#include<algorithm>
#define MAX    500500
using namespace std;
int u[MAX];
int d[MAX];
int hu[MAX];
int hd[MAX];
int mu,md;
int n,h,ru,rd;
int i;
int b,c;
int main(void)
{    
    scanf("%d",&n);
    scanf("%d",&h);
    md=-1;
    mu=-1;
    for (i=1;i<=n/2;i=i+1)
        {
         scanf("%d",&d[i]);
         scanf("%d",&u[i]);
         if (d[i]>md) md=d[i];
         if (u[i]>mu) mu=u[i];
        }    
    sort(&d[1],&d[n/2+1]);
    sort(&u[1],&u[n/2+1]);    
    for (i=n/2;i>=1;i=i-1)
        {
         hu[u[i]]=i;
         hd[d[i]]=i;         
        }
    for (i=mu;i>=1;i=i-1)
        if (hu[i]==0) hu[i]=hu[i+1];
    for (i=md;i>=1;i=i-1)
        if (hd[i]==0) hd[i]=hd[i+1];    
    b=n+1;c=0;    
    for (i=1;i<=h;i=i+1)
        {
         if (i>md) rd=0;
         else rd=n/2-hd[i]+1;
         if (h-i+1>mu) ru=0;
         else ru=n/2-hu[h-i+1]+1;
         if (ru+rd==b) 
            {
             c++;            
             continue;
            }
         if (ru+rd<b)
            {
             b=ru+rd;
             c=1;
             continue;
            }         
        }
    printf("%d %d",b,c);
}

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