Submission #83392

#	Time	Username	Problem	Language	Result	Execution time	Memory
83392		charlies_moo	Dostavljač (COCI18_dostavljac)	C++17	140 / 140	332 ms	2652 KiB

dostavljac

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

using namespace std;

const int N = 500;
const int M = 500;

typedef vector<int> vi;
int dp1[N][M+1], dp2[N][M+1];

void dfs(vi e[], int a[], int x, int p, int m) {
    for (int i = 1; i <= m; i++) {
    	dp1[x][i] = dp2[x][i] = a[x];
 	}

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

        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) {
            		dp1[x][j] = max(dp1[x][j], dp1[x][j-k-2] + dp1[e[x][i]][k]);
            		dp2[x][j] = max(dp2[x][j], dp2[x][j-k-2] + dp1[e[x][i]][k]);
				}
                dp2[x][j] = max(dp2[x][j], dp1[x][j-k-1] + dp2[e[x][i]][k]);
            }
        }
    }
    
//    printf("%d:\n", x);
//    for (int i = 0; i <= m; i++) {
//    	printf("%d %d %d\n", i, dp1[x][i], dp2[x][i]);
//	}
}

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);
    }
    
    dfs(e, a, 0, -1, m);

    printf("%d\n", dp2[0][m]);

    return 0;
}

Compilation message (stderr)

dostavljac.cpp: In function 'void dfs(vi*, int*, int, int, int)':
dostavljac.cpp:19:23: 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:44:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
dostavljac.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i]);
         ~~~~~^~~~~~~~~~~~~
dostavljac.cpp:52:14: 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: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14