Submission #218209

#	Time	Username	Problem	Language	Result	Execution time	Memory
218209		SamAnd	Fireworks (APIO16_fireworks)	C++17	19 / 100	26 ms	1792 KiB

fireworks

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
const int N = 302;
const long long INF = 1000000009000000009;

int n, m;
int p[N];
vector<pair<int, int> > a[N];

long long dp[N][N];
long long dpp[N][N];
void dfs(int x)
{
    if (x > n)
    {
        dp[x][0] = 0;
        return;
    }
    for (int i = 0; i < a[x].size(); ++i)
    {
        int h = a[x][i].first;
        dfs(h);
        for (int j = 0; j < N; ++j)
        {
            for (int k = 0; j + k < N; ++k)
            {
                dpp[h][j + k] = min(dpp[h][j + k], dp[h][j] + abs(a[x][i].second - k));
            }
        }
    }
    for (int j = 0; j < N; ++j)
    {
        dp[x][j] = 0;
        for (int i = 0; i < a[x].size(); ++i)
        {
            int h = a[x][i].first;
            dp[x][j] += dpp[h][j];
            dp[x][j] = min(dp[x][j], INF);
        }
    }
}

int main()
{
    scanf("%d%d", &n, &m);
    for (int i = 2; i <= n; ++i)
    {
        int d;
        scanf("%d%d", &p[i], &d);
        a[p[i]].push_back(m_p(i, d));
    }
    for (int i = n + 1; i <= n + m; ++i)
    {
        int d;
        scanf("%d%d", &p[i], &d);
        a[p[i]].push_back(m_p(i, d));
    }
    for (int i = 1; i <= n + m; ++i)
    {
        for (int j = 0; j < N; ++j)
            dpp[i][j] = dp[i][j] = INF;
    }
    dfs(1);
    long long ans = INF;
    for (int j = 0; j < N; ++j)
        ans = min(ans, dp[1][j]);
    printf("%lld\n", ans);
    return 0;
}

Compilation message (stderr)

fireworks.cpp: In function 'void dfs(int)':
fireworks.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a[x].size(); ++i)
                     ~~^~~~~~~~~~~~~
fireworks.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < a[x].size(); ++i)
                         ~~^~~~~~~~~~~~~
fireworks.cpp: In function 'int main()':
fireworks.cpp:46:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
fireworks.cpp:50:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &p[i], &d);
         ~~~~~^~~~~~~~~~~~~~~~~~~
fireworks.cpp:56:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &p[i], &d);
         ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 19 / 19
• Subtask 3: 0 / 29
• Subtask 4: 0 / 45