結果
| 問題 |
No.416 旅行会社
|
| ユーザー |
rsk0315
|
| 提出日時 | 2019-03-17 19:41:08 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 653 ms / 4,000 ms |
| コード長 | 2,951 bytes |
| コンパイル時間 | 931 ms |
| コンパイル使用メモリ | 73,596 KB |
| 最終ジャッジ日時 | 2025-01-06 22:34:55 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 21 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:90:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
90 | scanf("%zu %zu %zu", &N, &M, &Q);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:96:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
96 | scanf("%zu %zu", &p.first, &p.second);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:104:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
104 | scanf("%zu %zu", &p.first, &p.second);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ソースコード
#include <cstdio>
#include <cstdint>
#include <cassert>
#include <vector>
#include <utility>
#include <algorithm>
#include <set>
#include <tuple>
template <class Tp>
class semi_persistent_array {
using Node = std::pair<size_t, Tp>; // <timestamp, value>
std::vector<std::vector<Node>> entity;
size_t last = 0;
public:
semi_persistent_array(size_t n, Tp v=Tp()):
entity(n, std::vector<Node>(1, {0, v}))
{}
void update(size_t i, Tp x, size_t t) {
assert(last <= t);
last = t;
if (entity[i].back().first == t) {
entity[i].back().second = x;
} else {
assert(entity[i].back().first < t);
entity[i].emplace_back(t, x);
}
}
Tp get(size_t i, size_t t=-1) const {
if (entity[i].back().first <= t) {
// most-frequent case
return entity[i].back().second;
}
size_t lb = 0;
size_t ub = entity[i].size();
while (ub-lb > 1) {
size_t mid = (lb+ub)>>1;
((entity[i][mid].first <= t)? lb:ub) = mid;
}
return entity[i][lb].second;
}
};
class semi_persistent_union_find {
semi_persistent_array<intmax_t> tree;
size_t last = 0;
size_t find_root(size_t v, size_t t) const {
intmax_t pv = tree.get(v, t);
while (pv >= 0) {
v = pv;
pv = tree.get(pv, t);
}
return v;
}
public:
semi_persistent_union_find(size_t n): tree(n, -1) {}
bool unite(size_t u, size_t v, size_t t=-1) {
if (t+1 != 0) {
assert(last <= t);
last = t;
}
u = find_root(u, t);
v = find_root(v, t);
if (u == v) return false;
size_t su = -tree.get(u, t);
size_t sv = -tree.get(v, t);
if (su == sv) {
tree.update(v, -sv-1, t);
} else if (su > sv) {
std::swap(u, v);
}
tree.update(u, v, t);
return true;
}
bool connected(size_t u, size_t v, size_t t=-1) const {
return find_root(u, t) == find_root(v, t);
}
};
int main() {
size_t N, M, Q;
scanf("%zu %zu %zu", &N, &M, &Q);
using edge = std::pair<size_t, size_t>;
std::vector<edge> ab(M);
for (auto& p: ab) {
scanf("%zu %zu", &p.first, &p.second);
--p.first;
--p.second;
}
std::vector<edge> cd(Q);
std::set<edge> es;
for (auto& p: cd) {
scanf("%zu %zu", &p.first, &p.second);
--p.first;
--p.second;
es.emplace(p.first, p.second);
}
semi_persistent_union_find uf(N);
for (const auto& p: ab) {
size_t a, b;
std::tie(a, b) = p;
if (es.count({a, b})) continue;
uf.unite(a, b, 0);
}
for (size_t i = Q; i--;) {
size_t c, d;
std::tie(c, d) = cd[i];
uf.unite(c, d, Q-i);
}
for (size_t i = 1; i < N; ++i) {
if (!uf.connected(0, i, Q)) {
puts("0");
continue;
}
if (uf.connected(0, i, 0)) {
puts("-1");
continue;
}
size_t lb = 0;
size_t ub = Q;
while (ub-lb > 1) {
size_t mid = (lb+ub) >> 1;
(uf.connected(0, i, mid)? ub:lb) = mid;
}
printf("%zu\n", Q-lb);
}
}
rsk0315