oj.uz

답안 #57893

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
57893 2018-07-16T13:39:31 Z wilwxk Chase (CEOI17_chase) C++11
0 / 100
 482 ms 162596 KB 
#include <bits/stdc++.h>
using namespace std;

const int MAXN=1e5+5;
const int MAXK=102;
vector<int> g[MAXN];
int pai[MAXN], v[MAXN];
long long soma[MAXN], dp[MAXN][MAXK][2];
int n, x;

void predfs(int cur, int p) {
    soma[cur]=0; pai[cur]=p;
    for(auto viz : g[cur]) {
        if(viz==p) continue;
        predfs(viz, cur);
        soma[cur]+=v[viz];
    }
}

long long fazdp(int cur, int k, int flag) {
    if(k<0||(k==0&&flag==0)) return 0;
    if(dp[cur][k][flag]!=-1) return dp[cur][k][flag];
    long long resp=0;

    if(flag) {
        resp=soma[cur];
        for(auto viz : g[cur]) {
            if(viz==pai[cur]) continue;
            resp=max(resp, fazdp(viz, k, 0)+soma[cur]);
            resp=max(resp, fazdp(viz, k-1, 1)+soma[cur]);
        }
    }
    else {
        for(auto viz : g[cur]) {
            if(viz==pai[cur]) continue;
            resp=max(resp, fazdp(viz, k, 0));
            resp=max(resp, fazdp(viz, k-1, 1));
        }
    }

    //printf("%d %d %d -> %lld\n", cur, k, flag, resp);
    return dp[cur][k][flag]=resp;
}

int main() {
    scanf("%d %d", &n, &x);
    for(int i=1; i<=n; i++) scanf("%d", &v[i]);
    for(int i=0; i<n-1; i++) {
        int a, b; scanf("%d %d", &a, &b);
        g[a].push_back(b); g[b].push_back(a);
    }

    long long respf=0;
    if(n<=1000) {
        for(int cur=1; cur<=n; cur++) {
            predfs(cur, 6);
            memset(dp, -1, sizeof(dp));
            for(int i=0; i<=x; i++) respf=max(respf, fazdp(cur, i, 0));
            for(int i=1; i<=x; i++) respf=max(respf, fazdp(cur, i-1, 1));
        }
    }


    printf("%lld\n", respf);

}
/*
12 2
2 3 3 8 1 5 6 7 8 3 5 4
2 1
2 7
3 4
4 7
7 6
5 6
6 8
6 9
7 10
10 11
10 12
*/

Compilation message

chase.cpp: In function 'int main()':
chase.cpp:46:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &x);
     ~~~~~^~~~~~~~~~~~~~~~~
chase.cpp:47:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1; i<=n; i++) scanf("%d", &v[i]);
                             ~~~~~^~~~~~~~~~~~~
chase.cpp:49:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int a, b; scanf("%d %d", &a, &b);
                   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 465 ms 162404 KB Output is correct
2 Correct 482 ms 162596 KB Output is correct
3 Incorrect 425 ms 162596 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 465 ms 162404 KB Output is correct
2 Correct 482 ms 162596 KB Output is correct
3 Incorrect 425 ms 162596 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 74 ms 162596 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 465 ms 162404 KB Output is correct
2 Correct 482 ms 162596 KB Output is correct
3 Incorrect 425 ms 162596 KB Output isn't correct
4 Halted 0 ms 0 KB -