Submission #1825629
Source Code Expand
#include <cstdio> #include <cstring> #include <algorithm> #include <vector> using namespace std; const int maxn = 2e5; int n, son[maxn][2], len[maxn]; long long ans; typedef pair<long long, long long> Pair; vector<Pair> set[maxn]; void Combine(vector<Pair> &s, int u, int v) { s.clear(); if (u.empty()) { return; } for (int i = 0, j = 0; i < set[u].size(); ++i) { if (len[u] + len[v] + set[u][i].second + set[v][j].first > ans) { continue; } while (j + 1 < set[v].size() && len[u] + len[v] + set[u][i].second + set[v][j + 1].first <= ans) { ++j; } s.push_back(Pair(len[u] + set[u][i].first, len[v] + set[v][j].second)); } int m = s.size(); for (int i = set[u].size() - 1, j = set[v].size() - 1; i >= 0; --i) { if (len[u] + len[v] + set[v][j].second + set[u][i].first > ans) { continue; } while (j > 0 && len[u] + len[v] + set[v][j - 1].second + set[u][i].first <= ans) { --j; } s.push_back(Pair(len[v] + set[v][j].first, len[u] + set[u][i].second)); } inplace_merge(s.begin(), s.begin() + m, s.end()); m = 0; for (int i = 0; i < s.size(); ++i) { if (i == 0 || s[i].second < s[i - 1].second) { s[m++] = s[i]; } } s.resize(m); } bool Check(void) { for (int i = n - 1; i >= 0; --i) { if (son[i][0] == -1) { set[i] = {Pair(0, 0)}; } else { int &u = son[i][0], &v = son[i][1]; if (set[u].size() > set[v].size()) { swap(u, v); } Combine(set[i], u, v); } } return set[0].size(); } int main(void) { scanf("%d", &n); memset(son, -1, sizeof son); for (int i = 1; i < n; ++i) { int par; scanf("%d%d", &par, len + i); --par; swap(son[par][0], son[par][1]); son[par][0] = i; } long long low = 0, high = (long long)maxn * maxn; while (low < high) { long long mid = low + high >> 1; ans = mid; if (Check()) { high = mid; } else { low = mid + 1; } } printf("%lld\n", low); return 0; }
Submission Info
Submission Time | |
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Task | E - Shik and Travel |
User | orbitingflea |
Language | C++14 (GCC 5.4.1) |
Score | 0 |
Code Size | 2142 Byte |
Status | CE |
Compile Error
./Main.cpp: In function ‘void Combine(std::vector<std::pair<long long int, long long int> >&, int, int)’: ./Main.cpp:16:9: error: request for member ‘empty’ in ‘u’, which is of non-class type ‘int’ if (u.empty()) { ^ ./Main.cpp: In function ‘int main()’: ./Main.cpp:66:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ ./Main.cpp:70:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &par, len + i); ^