Submission #83365

#	Time	Username	Problem	Language	Result	Execution time	Memory
83365		charlies_moo	Dostavljač (COCI18_dostavljac)	C++17	14 / 140	221 ms	648 KiB

dostavljac

#include <cstdio>
#include <cstring>
#include <vector>
#include <algorithm>

using namespace std;

typedef vector<int> vi;
typedef struct {
    int *dp1, *dp2;
} node;

node *dfs(vi e[], int a[], int x, int p, int m) {
    node *ret = new node();
    ret->dp1 = new int[m+1];
    ret->dp2 = new int[m+1];
    for (int i = 1; i <= m; i++) {
    	ret->dp1[i] = ret->dp2[i] = a[x];
 	}
 	ret->dp1[0] = ret->dp2[0] = 0;

    for (int i = 0; i < e[x].size(); i++) {
        if (e[x][i] == p) {
            continue;
        }

        node *t = dfs(e, a, e[x][i], x, m);
        for (int j = m; j >= 0; j--) {
            for (int k = 0; k <= j - 1; k++) {
            	if (j - k - 2 >= 0) {
            		ret->dp1[j] = max(ret->dp1[j], ret->dp1[j-k-2] + t->dp1[k]);
				}
                ret->dp2[j] = max(ret->dp2[j], ret->dp1[j-k-1] + t->dp2[k]);
            }
        }
        
        delete[] t->dp1;
        delete[] t->dp2;
        delete t;
    }

    return ret;
}

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

    printf("%d\n", dfs(e, a, 0, -1, m)->dp2[m]);

    return 0;
}

Compilation message (stderr)

dostavljac.cpp: In function 'node* dfs(vi*, int*, int, int, int)':
dostavljac.cpp:22:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < e[x].size(); i++) {
                     ~~^~~~~~~~~~~~~
dostavljac.cpp: In function 'int main()':
dostavljac.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
dostavljac.cpp:50:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i]);
         ~~~~~^~~~~~~~~~~~~
dostavljac.cpp:55:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &u, &v);
         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 0 / 14
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 14
• Subtask 6: 0 / 14
• Subtask 7: 0 / 14
• Subtask 8: 0 / 14
• Subtask 9: 0 / 14
• Subtask 10: 0 / 14