Submission #310762

#	Time	Username	Problem	Language	Result	Execution time	Memory
310762		ly20	Chase (CEOI17_chase)	C++17	30 / 100	182 ms	101368 KiB

chase

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 112345, MAXK = 112;
vector <int> grafo[MAXN];
long long val[MAXN], vz[MAXN], dp[MAXN][MAXK];
int n, k;
long long resp;
void dfs(int v, int p) {
    for(int i = 0; i <= k; i++) resp = max(resp, dp[v][i]);
    for(int i = 0; i < grafo[v].size(); i++) {
        int viz = grafo[v][i];
        if(viz == p) continue;
        dp[viz][0] = 0;
        for(int j = 1; j <= k; j++) {
            dp[viz][j] = max(dp[v][j], dp[v][j - 1] + vz[viz] - val[v]);
        }
        dfs(viz, v);
    }
}
int main() {
    scanf("%d %d", &n, &k);
    for(int i = 1; i <= n; i++) {
        scanf("%lld", &val[i]);
    }
    for(int i = 0; i < n - 1; i++) {
        int a, b;
        scanf("%d %d", &a, &b);
        grafo[a].push_back(b); grafo[b].push_back(a);
        vz[a] += val[b]; vz[b] += val[a];
    }
    int i = 1;
        dp[i][0] = 0;
        for(int j = 1; j <= k; j++) dp[i][j] = vz[i];
        dfs(i, 0);
    printf("%lld\n", resp);
    return 0;
}

Compilation message (stderr)

chase.cpp: In function 'void dfs(int, int)':
chase.cpp:10:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i = 0; i < grafo[v].size(); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~
chase.cpp: In function 'int main()':
chase.cpp:21:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   21 |     scanf("%d %d", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~
chase.cpp:23:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |         scanf("%lld", &val[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~
chase.cpp:27:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |         scanf("%d %d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 30 / 30
• Subtask 4: 0 / 30