Submission #45135

#	Time	Username	Problem	Language	Result	Execution time	Memory
45135		reality	Bitaro’s Party (JOI18_bitaro)	C++17	14 / 100	2116 ms	481752 KiB

bitaro

#include "bits/stdc++.h"
using namespace std;
#define fi first
#define se second
#define ll long long
#define dbg(v) cerr<<#v<<" = "<<v<<'\n'
#define vi vector<int>
#define vl vector <ll>
#define pii pair<int,int>
#define mp make_pair
#define db long double
#define pb push_back
#define all(s) s.begin(),s.end()
template < class T > T smin(T &a,T b) {if (a > b) a = b;return a;}
template < class T > T smax(T &a,T b) {if (a < b) a = b;return a;}
const int N = (int)(1e6) + 5;
inline int readChar();
template <class T = int> inline T readInt();
template <class T> inline void writeInt( T x, char end = 0 );
inline void writeChar( int x );
inline void writeWord( const char *s );

/** Read */

static const int buf_size = 4096;

inline int getChar() {
    static char buf[buf_size];
    static int len = 0, pos = 0;
    if (pos == len)
        pos = 0, len = fread(buf, 1, buf_size, stdin);
    if (pos == len)
        return -1;
    return buf[pos++];
}

inline int readChar() {
    int c = getChar();
    while (c <= 32)
        c = getChar();
    return c;
}

template <class T>
inline T readInt() {
    int s = 1, c = readChar();
    T x = 0;
    if (c == '-')
        s = -1, c = getChar();
    while ('0' <= c && c <= '9')
        x = x * 10 + c - '0', c = getChar();
    return s == 1 ? x : -x;
}

/** Write */

static int write_pos = 0;
static char write_buf[buf_size];

inline void writeChar( int x ) {
    if (write_pos == buf_size)
        fwrite(write_buf, 1, buf_size, stdout), write_pos = 0;
    write_buf[write_pos++] = x;
}

template <class T>
inline void writeInt( T x, char end ) {
    if (x < 0)
        writeChar('-'), x = -x;

    char s[24];
    int n = 0;
    while (x || !n)
        s[n++] = '0' + x % 10, x /= 10;
    while (n--)
        writeChar(s[n]);
    if (end)
        writeChar(end);
}

inline void writeWord( const char *s ) {
    while (*s)
        writeChar(*s++);
}

struct Flusher {
    ~Flusher() {
        if (write_pos)
            fwrite(write_buf, 1, write_pos, stdout), write_pos = 0;
    }
} flusher;

vi g[N];

vector < pii > D[N];

vi G[N];

int d[N];

int was[N];

const int C = 300;

int main(void)
{
    int n,m,qq;
    n = readInt();
    m = readInt();
    qq = readInt();
    while (m --) {
    	int u,v;
    	u = readInt();
    	v = readInt();
    	g[v].pb(u);
        G[u].pb(v);
    }
    for (int i = 1;i <= n;++i) {
        D[i].pb(mp(0,i));
        for (auto it : g[i]) {
            auto ss = D[it];
            for (auto & w : ss)
                ++w.fi;
            vector < pii > nw;
            nw.resize(ss.size() + D[i].size());
            merge(all(ss),all(D[i]),nw.begin(),greater < pii > ());
            D[i].clear();
            for (auto w : nw) {
                if (!was[w.se])
                    D[i].pb(w);
                was[w.se] = 1;
            }
            for (auto w : nw)
                was[w.se] = 0;
            if (D[i].size() > C)
                D[i].resize(C);
        }
    }
    while (qq --) {
        int vertex = readInt();
        int Sz = readInt();
        vi v;
        while (Sz --) {
            v.pb(readInt());
            was[v.back()] = 1;
        }
        if (v.size() >= C) {
            for (int i = 1;i <= n;++i)
                d[i] = -1;
            d[vertex] = 0;
            for (int i = n;i;--i)
                for (auto it : G[i])
                    if (d[it] != -1)
                        smax(d[i],d[it] + 1);
            int ans = -1;
            for (int i = 1;i <= n;++i)
                if (!was[i])
                    smax(ans,d[i]);
            writeInt(ans,'\n');
        } else {
            int ans = -1;
            for (auto it : D[vertex])
                if (!was[it.se])
                    smax(ans,it.fi);
            writeInt(ans,'\n');
        }
        for (auto it : v)
            was[it] = 0;
        
    }
    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 86