Submission #1093416

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093416		Tymond	Fire (BOI24_fire)	C++17	0 / 100	1 ms	468 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define fi first
#define se second
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng64(chrono::steady_clock::now().time_since_epoch().count());
inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);}
inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);}
#ifdef DEBUG
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif
 
struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }
 
    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

struct Info{
    ll ind, blokSz, blokMod, val;
    Info(ll nind, ll nb, ll nm, ll nv){
        ind = nind;
        blokSz = nb;
        blokMod = nm;
        val = nv;
    }
};

const int MAXN = 2e5 + 7;
int p[MAXN];
int e[MAXN];
int tp[MAXN];
int n, m;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);

    cin >> n >> m;
    vector<pair<pii, int>> vec;
    for(int i = 1; i <= n; i++){
        cin >> p[i] >> e[i];
        if(p[i] < e[i]){
            tp[i] = 0;
            vec.pb({{p[i], e[i]}, i});
        }else{
            tp[i] = 1;
            if(e[i] != 0){
                vec.pb({{0, e[i]}, i});
            }
            if(p[i] != m - 1){
                vec.pb({{p[i], m - 1}, i});
            }
        }
    }

    sort(all(vec));
    int ans = 0;
    int k = 0;
    set<pii> s;
    int wsk = 0;
    vi used;
    while(k < m - 1){
        while(wsk < sz(vec) && vec[wsk].fi.fi <= k){
            s.insert({vec[wsk].fi.se, vec[wsk].se});
            wsk++;
        }

        if(sz(s) == 0){
            cout << -1 << '\n';
            return 0;
        }

        if((*(--s.end())).fi <= k){
            cout << -1 << '\n';
            return 0;
        }

        ans++;
        k = (*(--s.end())).fi;
        used.pb((*(--s.end())).se);
        s.erase(--s.end());
        //cout << k << '\n';
    }
    if(ans == 1){
        cout << ans << '\n';
        return 0;
    }
    //cout << ans << '\n';
    //for(auto ele : used){
    //    cout << ele << ' ';
    //}
    //cout << '\n';
    for(int i = 1; i <= n; i++){
        if(tp[i] == 0){
            continue;
        }

        int len = sz(used);
        if(used[0] == i && used.back() == i){
            len--;
        }else if(used[0] != i && used.back() != i){
            len++;
        }
        //cout << i << ' ' << len << '\n';
        if(p[used[1]] <= e[i]){
            int l = 0;
            int hi = sz(used) - 2;
            int mid;
            while(l < hi){
                mid = (l + hi + 1) / 2;
                if(p[used[mid + 1]] <= e[i]){
                    l = mid;
                }else{
                    hi =mid - 1;
                }
            }
            len -= (l + 1);
            if(used.back() == i){
                len++;
            }
        }

        if(p[i] <= e[used[sz(used) - 2]]){
            int l = 1;
            int hi = sz(used) - 1;
            int mid;
            while(l < hi){
                mid = (l + hi) / 2;
                if(e[used[mid - 1]] >= p[i]){
                    hi = mid;
                }else{
                    l = mid + 1;
                }
            }
            //cout << l << '\n';
            len -= (sz(used) - l);
            if(used[0] == i){
                len++;
            }
        }

        ans = min(ans, len);
    }

    cout << ans << '\n';

    return 0;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 17
• Subtask 3: 0 / 9
• Subtask 4: 0 / 13
• Subtask 5: 0 / 21
• Subtask 6: 0 / 26