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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#585212#9313. Make MaxNanako7_ixRE 0ms3556kbC++142.4kb2024-09-23 19:44:362024-09-23 19:44:37

Judging History

你现在查看的是最新测评结果

  • [2024-09-23 19:44:37]
  • 评测
  • 测评结果:RE
  • 用时:0ms
  • 内存:3556kb
  • [2024-09-23 19:44:36]
  • 提交

answer

#include<bits/stdc++.h>
#define pii pair<int, int>
#define endl "\n"
#define setpre(x) fixed << setprecision(x)
#define FOR(i, l, r) for(int i = l; i <= r; ++i)
#define ROF(i, l, r) for(int i = r; i >= l; --i)
#define fi first
#define se second
using namespace std;
using LL = long long;
constexpr int MAXN = 5e5 + 10;
constexpr int inf = 0x3f3f3f3f;
constexpr LL  INF = 0x3f3f3f3fffffffff;

struct DSU {
    int n;
    vector<int> f;
    vector<int> siz;
    DSU(int n) : n(n) {
        f.resize(n + 1);
        siz.assign(n + 1, 1);
        iota(f.begin(), f.end(), 0);
    }
    int find(int x) {
        if(f[x] == x) return x;
        return f[x] = find(f[x]);
    }
    void merge(int x, int y) {
        x = find(x), y = find(y);
        if(x != y) f[y] = x, siz[x] += siz[y];
    }
    int size(int x) {
        return siz[find(x)];
    }
};

void solve() {
    int n;
    cin >> n;
    vector<int> a(n + 1);
    FOR(i, 1, n) cin >> a[i];
    
    DSU dsu(n);
    vector<int> l(n + 1), r(n + 1);
    stack<int> stk;
    for(int i = 1; i <= n; ++i) {
        while(!stk.empty() && a[stk.top()] <= a[i]) stk.pop();
        if(!stk.empty()) l[i] = stk.top();
        else l[i] = -1;
        stk.push(i);
    }
    while(!stk.empty()) stk.pop();
    for(int i = n; i >= 1; --i) {
        while(!stk.empty() && a[stk.top()] <= a[i]) stk.pop();
        if(!stk.empty()) r[i] = stk.top();
        else r[i] = -1;
        stk.push(i);
    }
    FOR(i, 2, n) {
        if(a[i] == a[i - 1]) {
            dsu.merge(i - 1, i);
        }
    }
    priority_queue<pii, vector<pii>, greater<pii>> q;
    FOR(i, 1, n) {
        if(i == dsu.find(i)) {
            q.push({a[i], i});
        }
    }

    LL ans = 0;
    while(dsu.size(1) != n) {
        int u = q.top().se;
        q.pop();
        int L = l[u], R = r[u];
        assert(~L || ~R);
        ans += dsu.size(u);
        if(L == -1) {
            dsu.merge(R, u);
        } else if(R == -1) {
            dsu.merge(L, u);
        } else if(a[L] < a[R]) {
            dsu.merge(L, u);
        } else {
            dsu.merge(R, u);
        }
        u = dsu.find(u);
        q.push({u, a[u]});
    }
    cout << ans << endl;
}

signed main() {
    cin.tie(0), cout.tie(0) -> sync_with_stdio(0);
    int t = 1;
    cin >> t;
    while(t--) solve();
    return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3556kb

input:

4
2
1 2
2
2 2
7
1 1 1 2 2 2 2
3
1 2 3

output:

1
0
3
3

result:

ok 4 number(s): "1 0 3 3"

Test #2:

score: -100
Runtime Error

input:

2
198018
875421126 585870339 471894633 383529988 625397685 944061047 704695631 105113224 459022561 760848605 980735314 847376362 980571959 329939331 644635272 326439858 752879510 837384394 175179068 182094523 397239381 1199016 185143405 279638454 252374970 822030887 860312140 137248166 993229443 164...

output:


result: