oj.uz

답안 #111465

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
111465 2019-05-15T12:23:39 Z ecasdqina Fireworks (APIO16_fireworks) C++14
19 / 100
 39 ms 1124 KB 
#include <bits/stdc++.h>
using namespace std::literals::string_literals;
using i64 = long long;
using std::cout;
using std::endl;
using std::cin;

template<typename T>
std::vector<T> make_v(size_t a){return std::vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return std::vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

int main() {
	int n, m; scanf("%d%d", &n, &m);
	std::vector<int> leaf(m);
	std::vector<std::vector<std::pair<int, i64>>> g(n + m); n += m;
	for(int i = 1; i < n; i++) {
		int a; i64 b; scanf("%d%lld", &a, &b);
		
	//	g[i].push_back({a - 1, b});
		g[a - 1].push_back({i, b});
	}
	
	std::vector<i64> dist(n, 0);
	std::function<void (int, int, i64)> dfs = [&](int v, int par, i64 ari) {
		dist[v] = ari;
		for(auto e: g[v]) {
			if(e.first == par) continue;
			dfs(e.first, v, ari + e.second);
		}
	};
	dfs(0, -1, 0);
	
	i64 ans = 1LL << 60;
	if(n == 1) {
		std::function<i64 (std::vector<i64>&)> OSNIKTR = [](std::vector<i64>& vec) {
			i64 X = 0, Y = 1LL << 60;
			std::vector<i64> s(vec.size() + 1, 0);
			for(int i = 0; i < vec.size(); i++) s[i + 1] = s[i] + vec[i];
			
			for(i64 i = 0; i < vec.size(); i++) {
				i64 tmp = 0;
				tmp += i * vec[i] - s[i];
				tmp += (s.back() - s[i]) - ((i64)vec.size() - i) * vec[i];
				if(tmp < Y) {
					Y = tmp;
					X = vec[i];
				}
			}
			
			return X;
		};
		sort(begin(dist), end(dist));
		dist.erase(begin(dist));
		i64 makino = OSNIKTR(dist);
		
		ans = 0;
		for(auto v: dist) ans += std::abs(v - makino);
	} else if(n <= 300) {
		auto dp = make_v<i64>(n, 301);
		for(int i = 0; i < dp.size(); i++) for(int j = 0; j < dp[i].size(); j++) dp[i][j] = 1LL << 60;
		std::function<void (int)> solve = [&](int v) {
			if(v > n - m - 1) {
				dp[v][0] = 0;
				return;
			}
			
			for(auto e: g[v]) solve(e.first);
			for(int i = 0; i < dp[v].size(); i++) {
				i64 tmp = 0;
				for(auto e: g[v]) {
					i64 mi = 1LL << 60;
					for(int j = 0; j < dp[e.first].size(); j++) {
						i64 diff = i - (j + e.second);
						if(e.second + diff < 0) continue;
						mi = std::min(mi, dp[e.first][j] + std::abs(diff));
					}
					tmp += mi;
				}
				dp[v][i] = tmp;
			}
		};
		solve(0);
		
		for(auto v: dp[0]) ans = std::min(ans, v);
	} else {
		assert(0);
	}
	
	printf("%lld\n", ans);
	return 0;
}

Compilation message

fireworks.cpp: In lambda function:
fireworks.cpp:42:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0; i < vec.size(); i++) s[i + 1] = s[i] + vec[i];
                   ~~^~~~~~~~~~~~
fireworks.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(i64 i = 0; i < vec.size(); i++) {
                   ~~^~~~~~~~~~~~
fireworks.cpp: In function 'int main()':
fireworks.cpp:64:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < dp.size(); i++) for(int j = 0; j < dp[i].size(); j++) dp[i][j] = 1LL << 60;
                  ~~^~~~~~~~~~~
fireworks.cpp:64:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < dp.size(); i++) for(int j = 0; j < dp[i].size(); j++) dp[i][j] = 1LL << 60;
                                                     ~~^~~~~~~~~~~~~~
fireworks.cpp: In lambda function:
fireworks.cpp:72:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0; i < dp[v].size(); i++) {
                   ~~^~~~~~~~~~~~~~
fireworks.cpp:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int j = 0; j < dp[e.first].size(); j++) {
                     ~~^~~~~~~~~~~~~~~~~~~~
fireworks.cpp: In function 'int main()':
fireworks.cpp:17:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int n, m; scanf("%d%d", &n, &m);
            ~~~~~^~~~~~~~~~~~~~~~
fireworks.cpp:21:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a; i64 b; scanf("%d%lld", &a, &b);
                 ~~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
19.0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 6 ms 384 KB Output is correct
3 Correct 11 ms 496 KB Output is correct
4 Correct 17 ms 512 KB Output is correct
5 Correct 19 ms 640 KB Output is correct
6 Correct 17 ms 640 KB Output is correct
7 Correct 22 ms 768 KB Output is correct
8 Correct 23 ms 768 KB Output is correct
9 Correct 26 ms 936 KB Output is correct
10 Correct 30 ms 896 KB Output is correct
11 Correct 30 ms 896 KB Output is correct
12 Correct 30 ms 1024 KB Output is correct
13 Correct 34 ms 1124 KB Output is correct
14 Correct 39 ms 1024 KB Output is correct
15 Correct 34 ms 1024 KB Output is correct
16 Correct 34 ms 1024 KB Output is correct
17 Correct 36 ms 1024 KB Output is correct
18 Correct 37 ms 1024 KB Output is correct
19 Correct 32 ms 1024 KB Output is correct

Subtask #3
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -