oj.uz

답안 #243713

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
243713 2020-07-01T15:56:40 Z SamAnd Roadside Advertisements (NOI17_roadsideadverts) C++17
100 / 100
 90 ms 16632 KB 
#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 100005;

int n;
vector<int> g[N], gd[N];

const int m = 18;
int p[N][m];
int d[N];

int tin[N], tout[N], ti;

void dfs(int x, int p0)
{
    tin[x] = ++ti;
    p[x][0] = p0;
    for (int i = 1; i < m; ++i)
        p[x][i] = p[p[x][i - 1]][i - 1];
    for (int i = 0; i < g[x].size(); ++i)
    {
        int h = g[x][i];
        if (h == p0)
            continue;
        d[h] = d[x] + gd[x][i];
        dfs(h, x);
    }
    tout[x] = ti;
}

bool isp(int x, int y)
{
    return (tin[x] <= tin[y] && tout[y] <= tout[x]);
}

int lca(int x, int y)
{
    if (isp(x, y))
        return x;
    if (isp(y, x))
        return y;
    for (int i = m - 1; i >= 0; --i)
    {
        if (!isp(p[x][i], y))
            x = p[x][i];
    }
    return p[x][0];
}

bool so(int x, int y)
{
    return tin[x] < tin[y];
}

int dist(int x, int y)
{
    return d[x] + d[y] - 2 * d[lca(x, y)];
}

void solv()
{
    scanf("%d", &n);
    for (int i = 0; i < n - 1; ++i)
    {
        int x, y, d;
        scanf("%d%d%d", &x, &y, &d);
        g[x].push_back(y);
        g[y].push_back(x);
        gd[x].push_back(d);
        gd[y].push_back(d);
    }
    dfs(0, 0);
    int qq;
    scanf("%d", &qq);
    while (qq--)
    {
        int x[5];
        for (int i = 0; i < 5; ++i)
        {
            scanf("%d", &x[i]);
        }
        sort(x, x + 5, so);
        int ans = 0;
        ans += dist(lca(x[0], x[4]), x[0]);
        for (int i = 0; i < 5 - 1; ++i)
            ans += dist(x[i], x[i + 1]);
        ans += dist(lca(x[0], x[4]), x[4]);
        printf("%d\n", ans / 2);
    }
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    #endif // SOMETHING
    //ios_base::sync_with_stdio(false), cin.tie(0);
    solv();
    return 0;
}

//while ((double)clock() / CLOCKS_PER_SEC <= 0.9){}

Compilation message

roadsideadverts.cpp: In function 'void dfs(int, int)':
roadsideadverts.cpp:28:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < g[x].size(); ++i)
                     ~~^~~~~~~~~~~~~
roadsideadverts.cpp: In function 'void solv()':
roadsideadverts.cpp:70:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
roadsideadverts.cpp:74:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d", &x, &y, &d);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~
roadsideadverts.cpp:82:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &qq);
     ~~~~~^~~~~~~~~~~
roadsideadverts.cpp:88:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &x[i]);
             ~~~~~^~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 4992 KB Output is correct

Subtask #2
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 68 ms 13944 KB Output is correct
2 Correct 77 ms 16632 KB Output is correct
3 Correct 78 ms 16504 KB Output is correct
4 Correct 85 ms 16616 KB Output is correct
5 Correct 77 ms 16504 KB Output is correct
6 Correct 85 ms 16504 KB Output is correct
7 Correct 79 ms 16508 KB Output is correct
8 Correct 81 ms 16504 KB Output is correct
9 Correct 78 ms 16504 KB Output is correct
10 Correct 75 ms 16504 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 56 ms 12416 KB Output is correct
2 Correct 68 ms 15608 KB Output is correct
3 Correct 65 ms 15608 KB Output is correct
4 Correct 71 ms 15608 KB Output is correct
5 Correct 67 ms 15612 KB Output is correct
6 Correct 70 ms 15736 KB Output is correct
7 Correct 66 ms 15608 KB Output is correct
8 Correct 66 ms 15608 KB Output is correct
9 Correct 65 ms 15608 KB Output is correct
10 Correct 68 ms 15608 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 68 ms 13944 KB Output is correct
3 Correct 77 ms 16632 KB Output is correct
4 Correct 78 ms 16504 KB Output is correct
5 Correct 85 ms 16616 KB Output is correct
6 Correct 77 ms 16504 KB Output is correct
7 Correct 85 ms 16504 KB Output is correct
8 Correct 79 ms 16508 KB Output is correct
9 Correct 81 ms 16504 KB Output is correct
10 Correct 78 ms 16504 KB Output is correct
11 Correct 75 ms 16504 KB Output is correct
12 Correct 56 ms 12416 KB Output is correct
13 Correct 68 ms 15608 KB Output is correct
14 Correct 65 ms 15608 KB Output is correct
15 Correct 71 ms 15608 KB Output is correct
16 Correct 67 ms 15612 KB Output is correct
17 Correct 70 ms 15736 KB Output is correct
18 Correct 66 ms 15608 KB Output is correct
19 Correct 66 ms 15608 KB Output is correct
20 Correct 65 ms 15608 KB Output is correct
21 Correct 68 ms 15608 KB Output is correct
22 Correct 69 ms 15096 KB Output is correct
23 Correct 76 ms 13560 KB Output is correct
24 Correct 87 ms 15864 KB Output is correct
25 Correct 79 ms 15864 KB Output is correct
26 Correct 87 ms 15864 KB Output is correct
27 Correct 90 ms 15864 KB Output is correct
28 Correct 81 ms 15992 KB Output is correct
29 Correct 81 ms 15864 KB Output is correct
30 Correct 81 ms 15864 KB Output is correct
31 Correct 80 ms 15864 KB Output is correct