Submission #222894

#	Time	Username	Problem	Language	Result	Execution time	Memory
222894		kingfran1907	Paprike (COI18_paprike)	C++14	100 / 100	95 ms	21240 KiB

paprike

#include <bits/stdc++.h>

using namespace std;
typedef long long llint;
const int maxn = 1e5+10;

int n;
llint k;
llint h[maxn];
vector< int > graph[maxn];

pair<llint, llint> dfs(int x, int parr) {
    llint sol = 0;
    llint wh = h[x];

    vector< int > v;
    for (int i = 0; i < graph[x].size(); i++) {
        int tren = graph[x][i];
        if (tren == parr) continue;

        pair<llint, llint> ac = dfs(tren, x);
        sol += ac.first;
        v.push_back(ac.second);
        wh += ac.second;
    }

    sort(v.begin(), v.end());
    reverse(v.begin(), v.end());

    int ptr = 0;
    while (wh > k) {
        wh -= v[ptr++];
        sol++;
    }
    return make_pair(sol, wh);
}

int main() {
    scanf("%d%lld", &n, &k);
    for (int i = 1; i <= n; i++)
        scanf("%lld", h+i);

    for (int i = 1; i < n; i++) {
        int a, b;
        scanf("%d%d", &a, &b);

        graph[a].push_back(b);
        graph[b].push_back(a);
    }

    printf("%lld\n", dfs(1, -1));
    return 0;
}

Compilation message (stderr)

paprike.cpp: In function 'std::pair<long long int, long long int> dfs(int, int)':
paprike.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < graph[x].size(); i++) {
                     ~~^~~~~~~~~~~~~~~~~
paprike.cpp: In function 'int main()':
paprike.cpp:51:32: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'std::pair<long long int, long long int>' [-Wformat=]
     printf("%lld\n", dfs(1, -1));
                      ~~~~~~~~~~^
paprike.cpp:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%lld", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~~
paprike.cpp:41:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", h+i);
         ~~~~~^~~~~~~~~~~~~
paprike.cpp:45:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 13 / 13
• Subtask 3: 27 / 27
• Subtask 4: 49 / 49