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답안 #841846

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
841846 2023-09-02T07:28:19 Z vjudge1 Roadside Advertisements (NOI17_roadsideadverts) C++17
100 / 100
 68 ms 20016 KB 
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")

#include <bits/stdc++.h>
 
#define int long long 
#define pb push_back
#define ui unsigned int
#define ld long double
#define pl pair<long long int,  long long int>
#define boost ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ff first    
#define ss second
#define sz size()
#define all(x) x.begin(), x.end()
 
using namespace std;
 
const int maxn = 1e5 + 11;
const int inf = 1e18 + 1;
// const int mod = 1e9 + 7;
const int mod = 998244353;
const int dx[] = {-1, 0, 0, 1, -1, -1, 1, 1};
const int dy[] = {0, -1, 1 , 0, -1, 1, -1, 1};
const double eps = 1e-10;

vector<pair<int, int>> g[maxn];
int tin[maxn], tout[maxn], timer;
int p[maxn][21];
int d[maxn];

void dfs(int v, int pr = 0) {
    tin[ v ] = ++timer;
    p[ v ][ 0 ] = pr;

    for(int k = 1; k <= 20; k++) {
        p[ v ][ k ] = p[p[ v ][k - 1]][k - 1];
    }
    for(auto it : g[ v ]) {
        int to = it.ff;
        int w = it.ss;
        if(to == pr) {
            continue;
        }
        d[ to ] = d[ v ] + w;
        dfs(to, v);
    }
    tout[ v ] = timer;
}
bool cmp(int x, int y) {
    return tin[ x ] < tin[ y ];
}

bool parent(int u, int v) {
    if(!u) {
        return true;
    }

    return tin[ u ] <= tin[ v ] && tout[ u ] >= tout[ v ];
}

int lca(int u, int v) {
    if(parent(u, v)) return u;
    if(parent(v, u)) return v;

    for(int k = 20; k >= 0; k--) {
        if(!parent(p[ v ][ k ], u)) {
            v = p[ v ][ k ];
        }
    }
    return p[ v ][ 0 ];
}

int calc(int x, int y) {
    return d[ x ] + d[ y ] - d[lca(x, y)] - d[lca(x, y)];
}

void solve() {
    int n;

    cin >> n;

    for(int i = 1; i < n; i++) {
        int u, v, w;

        cin >> u >> v >> w;

        u++;
        v++;

        g[ u ].pb({v, w});
        g[ v ].pb({u, w});
    }
    dfs( 1 );

    // for(int i = 1; i <= n; i++) {
    //     cout << d[ i ] << ' ';
    // }
    // cout << "\n";
    int q;

    cin >> q;

    while(q--) {
        int a[ 5 ];

        for(int i = 0; i < 5; i++) {
            cin >> a[ i ];
            a[ i ]++;
        }
        sort(a, a + 5, cmp);

        // for(int i = 0; i < 5; i++) {
        //     cout << a[ i ] << ' ';
        // }
        // cout << "\n";

        int ans = 0;

        for(int i = 0; i < 4; i++) {
            ans += calc(a[ i ], a[i + 1]);
            // cout << calc(a[ i ], a[i + 1]) << ' ' << lca(a[ i ], a[i + 1]) << "\n";
        }
        ans += calc(lca(a[ 0 ], a[ 4 ]), a[ 0 ]);
        // cout << calc(lca(a[ 0 ], a[ 4 ]), a[ 0 ]) << ' ' << lca(a[ 0 ], a[ 4 ]) << "\n";
        ans += calc(lca(a[ 0 ], a[ 4 ]), a[ 4 ]);
        // cout << calc(lca(a[ 0 ], a[ 4 ]), a[ 4 ]) << ' ' << lca(a[ 0 ], a[ 4 ]) << "\n";


        cout << ans / 2 << "\n";
    }
}
    
signed main() {
    // freopen("sum.in", "r", stdin); 
    // freopen("sum.out", "w", stdout);
 
    boost;      

    int tt = 1;

    // cin >> tt;

    for(int i = 1; i <= tt; i++) {
        // cout << "Case " << i << ":\n";
        solve();    
    }           
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 4952 KB Output is correct

Subtask #2
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 33 ms 17832 KB Output is correct
2 Correct 34 ms 19024 KB Output is correct
3 Correct 38 ms 19028 KB Output is correct
4 Correct 37 ms 19044 KB Output is correct
5 Correct 33 ms 19024 KB Output is correct
6 Correct 33 ms 19032 KB Output is correct
7 Correct 32 ms 19188 KB Output is correct
8 Correct 34 ms 19180 KB Output is correct
9 Correct 37 ms 19024 KB Output is correct
10 Correct 51 ms 18972 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 27 ms 16660 KB Output is correct
2 Correct 45 ms 18776 KB Output is correct
3 Correct 38 ms 18772 KB Output is correct
4 Correct 41 ms 18516 KB Output is correct
5 Correct 43 ms 18572 KB Output is correct
6 Correct 28 ms 18768 KB Output is correct
7 Correct 29 ms 18776 KB Output is correct
8 Correct 36 ms 18568 KB Output is correct
9 Correct 38 ms 18544 KB Output is correct
10 Correct 30 ms 18520 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 4952 KB Output is correct
2 Correct 33 ms 17832 KB Output is correct
3 Correct 34 ms 19024 KB Output is correct
4 Correct 38 ms 19028 KB Output is correct
5 Correct 37 ms 19044 KB Output is correct
6 Correct 33 ms 19024 KB Output is correct
7 Correct 33 ms 19032 KB Output is correct
8 Correct 32 ms 19188 KB Output is correct
9 Correct 34 ms 19180 KB Output is correct
10 Correct 37 ms 19024 KB Output is correct
11 Correct 51 ms 18972 KB Output is correct
12 Correct 27 ms 16660 KB Output is correct
13 Correct 45 ms 18776 KB Output is correct
14 Correct 38 ms 18772 KB Output is correct
15 Correct 41 ms 18516 KB Output is correct
16 Correct 43 ms 18572 KB Output is correct
17 Correct 28 ms 18768 KB Output is correct
18 Correct 29 ms 18776 KB Output is correct
19 Correct 36 ms 18568 KB Output is correct
20 Correct 38 ms 18544 KB Output is correct
21 Correct 30 ms 18520 KB Output is correct
22 Correct 34 ms 17744 KB Output is correct
23 Correct 33 ms 16728 KB Output is correct
24 Correct 45 ms 19796 KB Output is correct
25 Correct 38 ms 19892 KB Output is correct
26 Correct 48 ms 20016 KB Output is correct
27 Correct 49 ms 19796 KB Output is correct
28 Correct 44 ms 19796 KB Output is correct
29 Correct 40 ms 19796 KB Output is correct
30 Correct 42 ms 19796 KB Output is correct
31 Correct 68 ms 19796 KB Output is correct