Submission #925902

#	Time	Username	Problem	Language	Result	Execution time	Memory
925902		dwuy	Pilot (NOI19_pilot)	C++14	40 / 100	31 ms	11184 KiB

pilot

#include <bits/stdc++.h>

#define fastIO ios_base::sync_with_stdio(false); cin.tie(NULL)
#define file(a) freopen(a".inp","r",stdin); freopen(a".out", "w",stdout)
#define fi first
#define se second
#define endl "\n"
#define len(s) int32_t(s.length())
#define MASK(k)(1LL<<(k))
#define TASK "test"

using namespace std;

typedef tuple<int, int, int> tpiii;
typedef pair<double, double> pdd;
typedef pair<int, int> pii;
typedef long long ll;

const long long OO = 1e18;
const int MOD = 1e9 + 7;
const int INF = 1e9;
const int MX = 1000005;

struct DSU{
    int n;
    vector<int> e;
    
    DSU(int n=0){
        this->n = n;
        this->e.assign(n+5, 0);
    }

    int fp(int u){
        return e[u] < 0? u : e[u] = fp(e[u]);
    }

    void unon(int u, int v){
        u = fp(u);
        v = fp(v);
        if(u == v) return;
        if(e[u] > e[v]) swap(u, v);
        e[u] += e[v];
        e[v] = u;        
    }

    int cost(int u){
        u = fp(u);
        return e[u]*(e[u]-1)/2;
    }
};

int n, q;
int res[MX];
pii a[MX];
pii b[MX];

void nhap(){
    cin >> n >> q;
    for(int i=1; i<=n; i++) cin >> a[i].fi, a[i].se = i;
    for(int i=1; i<=q; i++) cin >> b[i].fi, b[i].se = i;
}

void solve(){
    sort(a+1, a+1+n);
    sort(b+1, b+1+q);
    DSU dsu(n);
    int ans = 0;
    for(int i=1, j=1; j<=q; j++){
        while(i<=n && a[i].fi <= b[j].fi){
            dsu.e[a[i].se] = -1;
            if(dsu.e[a[i].se-1]) ans -= dsu.cost(a[i].se - 1), dsu.unon(a[i].se, a[i].se - 1);
            if(dsu.e[a[i].se+1]) ans -= dsu.cost(a[i].se + 1), dsu.unon(a[i].se, a[i].se + 1);
            ans += dsu.cost(a[i].se);
            i++;
        }
        res[b[j].se] = ans;
    }
    for(int i=1; i<=q; i++) cout << res[i] << endl;
}

int32_t main(){
    fastIO;
    //file(TASK);

    nhap();
    solve();

    return 0;
}

• Subtask 1: 3 / 3
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 15 / 15
• Subtask 5: 0 / 5
• Subtask 6: 0 / 9
• Subtask 7: 0 / 14
• Subtask 8: 0 / 10
• Subtask 9: 0 / 11
• Subtask 10: 0 / 11