Submission #879930

#	Time	Username	Problem	Language	Result	Execution time	Memory
879930		sleepntsheep	Stranded Far From Home (BOI22_island)	C++17	100 / 100	89 ms	14420 KiB

island

#include <iostream>
#include <utility>
#include <vector>
#include <tuple>
#include <algorithm>

int n, m, s[200000], p[200000], r[200000];
long long q[200000];

int f(int x)
{
    if (p[x] == x) return x;
    int w = f(p[x]);
    r[x] |= r[p[x]];
    return p[x] = w;
}

void u_(int x, int y)
{
    if ((x = f(x)) == (y = f(y))) return;
    if (q[x] < s[y]) r[x] = 1;
    q[y] += q[x];
    p[x] = y;
}

int main()
{
    scanf("%d%d", &n, &m);
    for (int i = 0; i < n; ++i) scanf("%d", s+i), p[i] = i, q[i] = s[i];
    std::vector<std::tuple<int, int, int>> e(m);
    for (auto &[w, u, v] : e)
    {
        scanf("%d%d", &u, &v);
        if (s[--u] > s[--v]) std::swap(u, v);
        w = s[v];
    }
    std::sort(e.begin(), e.end());
    for (auto [_, u, v] : e) u_(u, v);
    for (int i = 0; i < n; ++i) f(i), putchar(48+!r[i]);

    return 0;
}

Compilation message (stderr)

island.cpp: In function 'int main()':
island.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
island.cpp:29:38: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     for (int i = 0; i < n; ++i) scanf("%d", s+i), p[i] = i, q[i] = s[i];
      |                                 ~~~~~^~~~~~~~~~~
island.cpp:33:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         scanf("%d%d", &u, &v);
      |         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 30 / 30
• Subtask 5: 35 / 35