Submission #363578

#	Time	Username	Problem	Language	Result	Execution time	Memory
363578		ACmachine	MP3 Player (CEOI10_mp3player)	C++17	80 / 100	440 ms	262148 KiB

mp3player

#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef long long ll;
typedef long double ld;
typedef double db;
typedef string str;

typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<str> vstr;

#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back 
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define rsz resize 
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)
	
const double EPS = 1e-9;
const int MOD = 1e9+7; // 998244353;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};

#ifdef DEBUG
#define DBG if(1)
#else
#define DBG if(0)
#endif

#define dbg(x) cout << "(" << #x << " : " << x << ")" << endl;
// ostreams
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "[";  REP(i, v.size()) out << v[i] << ", ";  out << "]"; return out;}
// istreams
template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }
template<class T, class U>
istream& operator>>(istream& in, pair<T, U> &p){ in >> p.ff >> p.ss; return in; }
//searches
template<typename T, typename U>
T bsl(T lo, T hi, U f){ hi++; T mid; while(lo < hi){ mid = (lo + hi)/2; f(mid) ? hi = mid : lo = mid+1; } return lo; }
template<typename U>
double bsld(double lo, double hi, U f, double p = 1e-9){ int r = 3 + (int)log2((hi - lo)/p); double mid; while(r--){ mid = (lo + hi)/2; f(mid) ? hi = mid : lo = mid; } return (lo + hi)/2; }
template<typename T, typename U>
T bsh(T lo, T hi, U f){ lo--; T mid; while(lo < hi){ mid = (lo + hi + 1)/2; f(mid) ? lo = mid : hi = mid-1; } return lo; }
template<typename U>
double bshd(double lo, double hi, U f, double p = 1e-9){ int r = 3+(int)log2((hi - lo)/p); double mid; while(r--){ mid = (lo + hi)/2; f(mid) ? lo = mid : hi = mid; } return (lo + hi)/2; }
// some more utility functions
template<typename T>
pair<T, int> get_min(vector<T> &v){ typename vector<T> :: iterator it = min_element(v.begin(), v.end()); return mp(*it, it - v.begin());}
template<typename T>
pair<T, int> get_max(vector<T> &v){ typename vector<T> :: iterator it = max_element(v.begin(), v.end()); return mp(*it, it - v.begin());}        
template<typename T> bool ckmin(T& a, const T& b){return b < a ? a = b , true : false;}
template<typename T> bool ckmax(T& a, const T& b){return b > a ? a = b, true : false;}
int vmax;
struct node{
    vi nxt;
    node(){
        nxt.resize(vmax + 1);
        REP(i, vmax + 1) nxt[i] = i;
    }
    void apply(int l, int r, ll val){
        if(val == 1){
            REP(i, vmax + 1){
                nxt[i] = min(vmax, i + 1);
            }
        }
        else{
            REP(i, vmax + 1){
                nxt[i] = max(0, i - 1);
            }
        }
    }
};
struct segtree{
    node comb(node const &a, node const &b){
        node res;
        REP(i, vmax + 1){
            res.nxt[i] = b.nxt[a.nxt[i]];
        }
        return res;
    } 
    void push(int l, int r, int v){ 
    }
    int sz;
    vector<node> tree; 
    segtree(int _sz){ // tree is resized to default values set in node
        sz = 1; while(sz < _sz) sz<<=1;
        tree.resize(2*sz); 
    } 
    void build(vector<node> &init){
        for(int i = 0; i < sz; ++i) 
            if(i < init.size())
                tree[i+sz] = init[i];
        for(int i = sz-1; i > 0; --i)
            tree[i] = comb(tree[i<<1], tree[i<<1|1]);
    } 
    node query(int l, int r){return query0(l, r, 0, sz, 1);} 
    node query0(int l, int r, int beg, int end, int v){ 
        if(beg >= l && end <= r)
            return tree[v];
        push(beg, end, v);
        int mid = (beg + end) >> 1;
        node res;
        if(beg >= r || mid <= l) res = query0(l, r, mid, end, v<<1|1); //[beg, mid]
        else if(mid >= r || end <= l) res = query0(l, r, beg, mid, v<<1);
        else res = comb(query0(l, r, beg, mid, v<<1), query0(l, r, mid, end, v<<1|1));
        return res;
    } 
    template<typename... T>
    void upd(int l, int r, T ...args){upd0(l, r, 0, sz, 1, args...);}
    template<typename... T>
    void upd0(int l, int r, int beg, int end, int v, T ...args){
        if(beg >= r || end <= l)
            return;
        if(beg >= l && end <= r){
            tree[v].apply(beg, end, args...);
            return;
        }
        push(beg, end, v);
        int mid = (beg + end) >> 1;
        upd0(l, r, beg, mid, v<<1, args...);
        upd0(l, r, mid, end, v<<1|1, args...);
        tree[v] = comb(tree[v<<1], tree[v<<1|1]);
    } 
};

    
int main(){
 	ios_base::sync_with_stdio(false);
 	cin.tie(NULL); cout.tie(NULL);
	int n, v2;
    cin >> n >> vmax >> v2;
    vector<pair<int, int>> a(n);
    REP(i, n){
        char x; cin >> x;
        if(x == '+') a[i].ff = 1;
        else a[i].ff = -1;
        cin >> a[i].ss; 
    }
    FORD(i, n - 1, 1, 1)
        a[i].ss = a[i].ss - a[i - 1].ss;  
    a[0].ss = 2 * INF + 25;
    segtree st(n); 
    vector<array<int, 3>> evs(n);
    REP(i, n){
        evs[i] = {a[i].ss, i, a[i].ff};
    }
    sort(all(evs));
    vi event_times;
    REP(i, n){
        event_times.pb(evs[i][0] - 1);
    }
    event_times.pb(2 * INF + 17);
    int pp = 0;
    int resT = 0;
    int resV0 = v2;
    for(int e : event_times){
        while(pp < evs.size() && evs[pp][0] <= e){
            st.upd(evs[pp][1], evs[pp][1] + 1, evs[pp][2]);
            pp++;
        }
        auto no = st.query(0, n);
        int cmax = -1;
        REP(i, no.nxt.size()){
            if(no.nxt[i] == v2) 
                cmax = max(cmax, i);
        }
        if(cmax != -1){
            resT = e;
            resV0 = cmax;
        }
    }
    if(resT == 2 * INF + 17){
        cout << "infinity" << "\n";
    }
    else{
        cout << resT << " " << resV0 << "\n";
    }
    return 0;
}

Compilation message (stderr)

mp3player.cpp: In member function 'void segtree::build(std::vector<node>&)':
mp3player.cpp:121:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  121 |             if(i < init.size())
      |                ~~^~~~~~~~~~~~~
mp3player.cpp: In function 'int main()':
mp3player.cpp:187:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 3> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  187 |         while(pp < evs.size() && evs[pp][0] <= e){
      |               ~~~^~~~~~~~~~~~
mp3player.cpp:26:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
      |                                        ^
mp3player.cpp:28:18: note: in expansion of macro 'FOR'
   28 | #define REP(i,b) FOR(i,0,b,1)
      |                  ^~~
mp3player.cpp:193:9: note: in expansion of macro 'REP'
  193 |         REP(i, no.nxt.size()){
      |         ^~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10