oj.uz

답안 #251834

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
251834 2020-07-22T10:55:02 Z VEGAnn Uzastopni (COCI15_uzastopni) C++14
160 / 160
 380 ms 19064 KB 
#include <bits/stdc++.h>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")
#define sz(x) ((int)x.size())
#define i2 array<int,2>
#define PB push_back
using namespace std;
typedef long long ll;
const int N = 10100;
const int V = 110;
const int C = 22;
const int md = 10007;
vector<int> g[N];
bitset<V> f[N][V], lf[V], clr, was[V];
int n, a[N];

void clear(){
    for (int i = 0; i < V; i++)
        lf[i] = clr;
}

void dfs(int v, int p){
    int lst = 0;

    for (int u : g[v]){
        if (u == p) continue;

        dfs(u, v);
    }

    clear();

    for (int i = 0; i < V; i++)
    for (int j = i; j < V; j++)
        was[i][j] = 0;

    was[a[v]][a[v]] = 1;

    lf[a[v]][a[v]] = 1;

    for (int u : g[v]){
        if (u == p) continue;

        for (int l = 1; l < V; l++)
        for (int r = l; r < V; r++)
            if (f[u][l][r]) {
                was[l][r] = 1;

                if (r < a[v] || l > a[v])
                    lf[l][r] = 1;
            }
    }

    for (int l = V - 1; l > 0; l--)
    for (int r = l; r < V; r++)
        if (r + 1 < V && was[l][r]) {
            if ((l == r && l == a[v])||
                (l > a[v] || r < a[v]))
                lf[l] |= lf[r + 1];
        }

    for (int l = 1; l <= a[v]; l++)
    for (int r = a[v]; r < V; r++)
        f[v][l][r] = lf[l][r];
}

int main() {
#ifdef _LOCAL
    freopen("in.txt","r",stdin); // freopen("output.txt","w",stdout);
#else
//    freopen("mining.in","r",stdin); freopen("mining.out","w",stdout);
    ios_base::sync_with_stdio(0); cin.tie(0);
#endif

    cin >> n;

    for (int i = 0; i < n; i++)
        cin >> a[i];

    for (int i = 1; i < n; i++){
        int x, y; cin >> x >> y;
        x--; y--;

        g[x].PB(y);
        g[y].PB(x);
    }

    dfs(0, -1);

    int ans = 0;

    for (int l = 1; l < V; l++)
    for (int r = l; r < V; r++)
        if (f[0][l][r]) {
//            cerr << l << " " << r << '\n';
            ans++;
        }

    cout << ans;

    return 0;
}

Compilation message

uzastopni.cpp: In function 'void dfs(int, int)':
uzastopni.cpp:26:9: warning: unused variable 'lst' [-Wunused-variable]
     int lst = 0;
         ^~~

Subtask #1
160.0 / 160.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 640 KB Output is correct
2 Correct 3 ms 640 KB Output is correct
3 Correct 3 ms 768 KB Output is correct
4 Correct 3 ms 768 KB Output is correct
5 Correct 3 ms 768 KB Output is correct
6 Correct 4 ms 768 KB Output is correct
7 Correct 4 ms 768 KB Output is correct
8 Correct 5 ms 768 KB Output is correct
9 Correct 4 ms 768 KB Output is correct
10 Correct 4 ms 768 KB Output is correct
11 Correct 330 ms 18168 KB Output is correct
12 Correct 313 ms 18168 KB Output is correct
13 Correct 320 ms 18168 KB Output is correct
14 Correct 362 ms 18976 KB Output is correct
15 Correct 368 ms 18812 KB Output is correct
16 Correct 375 ms 19064 KB Output is correct
17 Correct 326 ms 18168 KB Output is correct
18 Correct 330 ms 18296 KB Output is correct
19 Correct 366 ms 18168 KB Output is correct
20 Correct 380 ms 18168 KB Output is correct