Submission #47698

#	Time	Username	Problem	Language	Result	Execution time	Memory
47698		square1001	Fireworks (APIO16_fireworks)	C++14	7 / 100	26 ms	28832 KiB

fireworks

#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int N, M, p[300009], c[300009], id[300009]; vector<int> g[300009]; vector<long long> v[300009];
int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(false);
	cin >> N >> M;
	long long sum = 0;
	for (int i = 1; i < N + M; i++) {
		cin >> p[i] >> c[i];
		g[--p[i]].push_back(i);
		sum += c[i];
		if (i >= N) {
			v[i - N].push_back(c[i]);
			v[i - N].push_back(c[i]);
			id[i] = i - N;
		}
	}
	for (int i = N - 1; i >= 0; i--) {
		int mx = -1;
		for (int j : g[i]) {
			if (mx < v[id[j]].size()) {
				mx = v[id[j]].size();
				id[i] = id[j];
			}
		}
		for (int j : g[i]) {
			if (id[j] != id[i]) {
				v[id[i]].insert(v[id[i]].end(), v[id[j]].begin(), v[id[j]].end());
			}
		}
		sort(v[i].begin(), v[i].end());
		v[i].resize(v[i].size() - g[i].size() + 1);
		v[i][v[i].size() - 1] += c[i];
		v[i][v[i].size() - 2] += c[i];
	}
	for (int i = 0; i < v[0].size(); i++) {
		sum -= (v[0][i] - (i == 0 ? 0 : v[0][i - 1])) * (v[0].size() - i - 1);
	}
	cout << sum << '\n';
	return 0;
}

Compilation message (stderr)

fireworks.cpp: In function 'int main()':
fireworks.cpp:24:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (mx < v[id[j]].size()) {
        ~~~^~~~~~~~~~~~~~~~~
fireworks.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < v[0].size(); i++) {
                  ~~^~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 19
• Subtask 3: 0 / 29
• Subtask 4: 0 / 45