Submission #1277687

#	Time	Username	Problem	Language	Result	Execution time	Memory
1277687		wedonttalkanymore	Pilot (NOI19_pilot)	C++20	100 / 100	398 ms	63124 KiB

pilot

#include <bits/stdc++.h>
/*
    Brute to win
*/
using namespace std;
using ll = long long;

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 1e6 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 19;

int n, q;
pii a[N];
vector <pii> query;
int res = 0;
int ans[N];
bool on[N];

struct DSU {
    int par[N], sz[N];
    void make() {
        for (int i = 1; i <= n; i++) {
            par[i] = i;
            sz[i] = 1;
        }
    }
    int find(int u) {
        if (u == par[u]) return u;
        return par[u] = find(par[u]);
    }
    void join(int u, int v) {
        u = find(u), v = find(v);
        if (u != v) {
            if (sz[u] < sz[v]) swap(u, v);
            res -= sz[u] * (sz[u] + 1) / 2;
            res -= sz[v] * (sz[v] + 1) / 2;
            sz[u] += sz[v];
            par[v] = u;
            res += sz[u] * (sz[u] + 1) / 2;
        }
    }
} dsu;

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> n >> q;
    dsu.make();
    for (int i = 1; i <= n; i++) {
        cin >> a[i].fi;
        a[i].se = i;
    }
    for (int i = 1; i <= q; i++) {
        int x;
        cin >> x;
        query.emplace_back(x, i);
    }
    sort(a + 1, a + n + 1);
    sort(query.begin(), query.end());
    int l = 1;
    for (int i = 0; i < q; i++) {
        while(l <= n && a[l].fi <= query[i].fi) {
            on[a[l].se] = 1;
            res++;
            if (a[l].se != 1 && on[a[l].se - 1]) dsu.join(a[l].se - 1, a[l].se);
            if (a[l].se != n && on[a[l].se + 1]) dsu.join(a[l].se, a[l].se + 1);
            l++;
        }
        ans[query[i].se] = res;
    }
    for (int i = 1; i <= q; i++) cout << ans[i] << '\n';
    return 0;
}

Compilation message (stderr)

pilot.cpp: In function 'int main()':
pilot.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
pilot.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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