oj.uz

답안 #174716

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
174716 2020-01-06T21:28:10 Z stefdasca Museum (CEOI17_museum) C++14
100 / 100
 1428 ms 592864 KB 
#include<bits/stdc++.h>
#define god dimasi5eks
#pragma GCC optimize("O3")
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define mod 1000000007
#define dancila 3.14159265359
#define eps 1e-9

// #define fisier

using namespace std;

typedef long long ll;


int add(int a, int b)
{
    ll x = a+b;
    if(x >= mod)
        x -= mod;
    if(x < 0)
        x += mod;
    return x;
}
ll mul(ll a, ll b)
{
    return (a*b) % mod;
}

ll pw(ll a, ll b)
{
    ll ans = 1;
    while(b)
    {
        if(b & 1)
            ans = (ans * a) % mod;
        a = (a * a) % mod;
        b >>= 1;
    }
    return ans;
}
int n, k, x;
int dp[2][10002][10002];
int xtr[10002][10002];

vector<pair<int, int> >v[10002];

vector<int> dp2[2][10002];
vector<int> xtr2[2][10002];
vector<bool> viz2[2][10002];
int sts[10002];
void dfs(int dad, int nod, int cost)
{
    sts[nod] = 1;
    for(int i = 0; i < v[nod].size(); ++i)
    {
        int vecin = v[nod][i].fi;
        if(vecin == dad)
            continue;
        dfs(nod, vecin, v[nod][i].se);
        sts[nod] += sts[vecin];
    }
    dp2[0][nod].resize(sts[nod] + 2, 0);
    dp2[1][nod].resize(sts[nod] + 2, 0);

    xtr2[0][nod].resize(sts[nod] + 2, 0);
    xtr2[1][nod].resize(sts[nod] + 2, 0);

    viz2[0][nod].resize(sts[nod] + 2, 0);
    viz2[1][nod].resize(sts[nod] + 2, 0);


    viz2[0][nod][1] = 1;
    sts[nod] = 1;
    for(int i = 0; i < v[nod].size(); ++i)
    {
        int vecin = v[nod][i].fi;
        if(vecin == dad)
            continue;
        int edcost = v[nod][i].se;
        for(int j = min(k, sts[nod]); j >= 1; --j)
            for(int sz = 1; sz <= min(sts[vecin], k - j); ++sz)
            {
                if(viz2[0][nod][j])
                    if(!viz2[1][nod][j + sz] || dp2[0][nod][j] + dp[1][vecin][sz] + edcost < dp2[1][nod][j + sz])
                    {
                        dp2[1][nod][j + sz] = dp2[0][nod][j] + dp[1][vecin][sz] + edcost;
                        viz2[1][nod][j + sz] = 1;
                        xtr2[1][nod][j + sz] = xtr[vecin][sz];
                    }
                    else
                        if(dp2[0][nod][j] + dp[1][vecin][sz] + edcost == dp2[1][nod][j + sz])
                        xtr2[1][nod][j + sz] = min(xtr2[1][nod][j + sz], xtr[vecin][sz]);
                for(int trb = 0; trb <= 1; ++trb)
                {
                    if(!viz2[trb][nod][j])
                        continue;
                    if(!viz2[trb][nod][j + sz] || dp2[trb][nod][j] + dp[0][vecin][sz] + 2 * edcost < dp2[trb][nod][j + sz])
                    {
                        dp2[trb][nod][j + sz] = dp2[trb][nod][j] + dp[0][vecin][sz] + 2 * edcost;
                        viz2[trb][nod][j + sz] = 1;
                        xtr2[trb][nod][j + sz] = xtr2[trb][nod][j];
                    }
                    else
                        if(dp2[trb][nod][j] + dp[0][vecin][sz] + 2 * edcost == dp2[trb][nod][j + sz])
                            xtr2[trb][nod][j + sz] = min(xtr2[trb][nod][j + sz], xtr2[trb][nod][j]);
                }
            }
        sts[nod] += sts[vecin];
    }
    for(int i = 2; i <= min(k, sts[nod]); ++i)
    {
        dp[1][nod][i] = dp2[1][nod][i];
        xtr[nod][i] = xtr2[1][nod][i];
        dp[0][nod][i] = dp2[0][nod][i];
    }
    for(int i = 1; i <= min(k, sts[nod]); ++i)
        xtr[nod][i] += cost;
    /*
    cout << nod << '\n';
    for(int i = 1; i <= sts[nod]; ++i)
        cout << dp[0][nod][i] << " ";
    cout << '\n';
    for(int i = 1; i <= sts[nod]; ++i)
        cout << dp[1][nod][i] << " ";
    cout << '\n';
    for(int i = 1; i <= sts[nod]; ++i)
        cout << xtr[nod][i] << " ";
    cout << '\n';
    */
}
int main()
{

    #ifdef fisier
        ifstream f("input.in");
        ofstream g("output.out");
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> k >> x;
    for(int i = 1; i < n; ++i)
    {
        int a, b, c;
        cin >> a >> b >> c;
        v[a].pb({b, c});
        v[b].pb({a, c});
    }
    dfs(0, x, 0);
    cout << dp[1][x][k] << '\n';
    return 0;
}

Compilation message

museum.cpp: In function 'void dfs(int, int, int)':
museum.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v[nod].size(); ++i)
                    ~~^~~~~~~~~~~~~~~
museum.cpp:78:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v[nod].size(); ++i)
                    ~~^~~~~~~~~~~~~~~
museum.cpp:87:19: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
                 if(viz2[0][nod][j])
                   ^

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2560 KB Output is correct
2 Correct 4 ms 2552 KB Output is correct
3 Correct 4 ms 2552 KB Output is correct
4 Correct 4 ms 2424 KB Output is correct
5 Correct 4 ms 2424 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 131 ms 100216 KB Output is correct
2 Correct 125 ms 100956 KB Output is correct
3 Correct 382 ms 381292 KB Output is correct
4 Correct 209 ms 192392 KB Output is correct
5 Correct 148 ms 124920 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 131 ms 100216 KB Output is correct
2 Correct 125 ms 100956 KB Output is correct
3 Correct 382 ms 381292 KB Output is correct
4 Correct 209 ms 192392 KB Output is correct
5 Correct 148 ms 124920 KB Output is correct
6 Correct 121 ms 89380 KB Output is correct
7 Correct 277 ms 264184 KB Output is correct
8 Correct 93 ms 47352 KB Output is correct
9 Correct 101 ms 47816 KB Output is correct
10 Correct 101 ms 49784 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 2560 KB Output is correct
2 Correct 4 ms 2552 KB Output is correct
3 Correct 4 ms 2552 KB Output is correct
4 Correct 4 ms 2424 KB Output is correct
5 Correct 4 ms 2424 KB Output is correct
6 Correct 131 ms 100216 KB Output is correct
7 Correct 125 ms 100956 KB Output is correct
8 Correct 382 ms 381292 KB Output is correct
9 Correct 209 ms 192392 KB Output is correct
10 Correct 148 ms 124920 KB Output is correct
11 Correct 121 ms 89380 KB Output is correct
12 Correct 277 ms 264184 KB Output is correct
13 Correct 93 ms 47352 KB Output is correct
14 Correct 101 ms 47816 KB Output is correct
15 Correct 101 ms 49784 KB Output is correct
16 Correct 269 ms 102720 KB Output is correct
17 Correct 684 ms 102832 KB Output is correct
18 Correct 384 ms 230392 KB Output is correct
19 Correct 243 ms 47480 KB Output is correct
20 Correct 234 ms 52088 KB Output is correct
21 Correct 1193 ms 368752 KB Output is correct
22 Correct 883 ms 102828 KB Output is correct
23 Correct 1006 ms 47760 KB Output is correct
24 Correct 867 ms 52808 KB Output is correct
25 Correct 1428 ms 592864 KB Output is correct