Submission #379299

#	Time	Username	Problem	Language	Result	Execution time	Memory
379299		jainbot27	Arranging Tickets (JOI17_arranging_tickets)	C++17	0 / 100	4 ms	5100 KiB

arranging_tickets

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

#define int ll
#define f first
#define s second
#define pb push_back
#define ar array
#define all(x) x.begin(), x.end()
#define siz(x) (int)x.size()

#define FOR(x, y, z) for(int x = (y); x < (z); x++)
#define ROF(x, z, y) for(int x = (y-1); x >= (z); x--)
#define F0R(x, z) FOR(x, 0, z)
#define R0F(x, z) ROF(x, 0, z)
#define trav(x, y) for(auto&x:y)

using ll = long long;
using vi = vector<int>;
using vl = vector<long long>;
using pii = pair<int, int>;
using vpii = vector<pair<int, int>>;

template<class T> inline bool ckmin(T&a, T b) {return b < a ? a = b, 1 : 0;}
template<class T> inline bool ckmax(T&a, T b) {return b > a ? a = b, 1 : 0;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const char nl = '\n';
const int mxN = 2e5 + 10;
const int MOD = 1e9 + 7;
const long long infLL = 1e18;

int n, m, mx; ll p[mxN], b[mxN];
vpii v[mxN];
int l, r;

bool chk(int t, ll m, ll n){
    ll x  = 0;
    //cout << t << ' ' << m << ' ' << n << nl;
    FOR(i, 1, n+1) b[i] = 0;
    priority_queue<pii> pq;
    FOR(i, 1, t+1){
        ll need = (n+p[i]-m+1)/2-x;
        if(i==t) need = n-x;
        trav(x, v[i]){
            if(x.f >= t) pq.push(x);
        }
        if(need>0) x += need;
        while(need>0){
            if(pq.empty()) return 0;
            auto T = pq.top(); pq.pop();
            if(T.s>need) {
                b[T.f] += need;
                T.s -= need, pq.push(T);
                break;
            }
            else{
                b[T.f] += T.s;
                need -= T.s;
            }
        }
    }
    FOR(i, t+1, ::n+1){
        trav(x, v[i]){
            b[i] += x.s; b[x.f] -= x.s;
        }
    }
    while(!pq.empty()){
        b[t] += pq.top().s; b[pq.top().f] -= pq.top().s;
        pq.pop();
    }
    FOR(i, t, ::n+1){
        b[i] += b[i-1];
        if(b[i]>m) return 0;
    }
    return 1;
}

int32_t main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> m;
    FOR(i, 1, m+1){
        int a, b, c; cin >> a >> b >> c;
        p[a]+=c, p[b]-=c;
        v[a].pb({b, c});
    }
    FOR(i, 1, n+1) p[i] += p[i-1];
    mx = *max_element(p, p+n+1);
    FOR(i, 1, n+1){
        if(mx==p[i]){
            l = i;
            break;
        }
    }
    ROF(i, 1, n+1){
        if(mx==p[i]){
            r = i;
            break;
        }
    }
    ll L = 1, R = mx;
    while(L<R){
        ll m = (L+R)/2;
        if(chk(l, m, mx-m)||chk(l, m, mx-m+1)||chk(r, m, mx-m)||chk(r, m, mx-m+1)) R = m;
        else L = m+1;
    }
    cout << L << nl;
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 35
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 15