結果
| 問題 |
No.1370 置換門松列
|
| コンテスト | |
| ユーザー |
沙耶花
|
| 提出日時 | 2021-01-29 21:41:58 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 50 ms / 2,000 ms |
| コード長 | 4,552 bytes |
| コンパイル時間 | 2,413 ms |
| コンパイル使用メモリ | 206,928 KB |
| 最終ジャッジ日時 | 2025-01-18 09:04:17 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 5 |
| other | AC * 25 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:145:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
145 | scanf("%d",&a[i]);
| ~~~~~^~~~~~~~~~~~
ソースコード
#include <stdio.h>
#include <bits/stdc++.h>
#include <algorithm>
#include <algorithm>
#include <utility>
#include <vector>
namespace atcoder {
namespace internal {
template <class E> struct csr {
std::vector<int> start;
std::vector<E> elist;
csr(int n, const std::vector<std::pair<int, E>>& edges)
: start(n + 1), elist(edges.size()) {
for (auto e : edges) {
start[e.first + 1]++;
}
for (int i = 1; i <= n; i++) {
start[i] += start[i - 1];
}
auto counter = start;
for (auto e : edges) {
elist[counter[e.first]++] = e.second;
}
}
};
// Reference:
// R. Tarjan,
// Depth-First Search and Linear Graph Algorithms
struct scc_graph {
public:
scc_graph(int n) : _n(n) {}
int num_vertices() { return _n; }
void add_edge(int from, int to) { edges.push_back({from, {to}}); }
// @return pair of (# of scc, scc id)
std::pair<int, std::vector<int>> scc_ids() {
auto g = csr<edge>(_n, edges);
int now_ord = 0, group_num = 0;
std::vector<int> visited, low(_n), ord(_n, -1), ids(_n);
visited.reserve(_n);
auto dfs = [&](auto self, int v) -> void {
low[v] = ord[v] = now_ord++;
visited.push_back(v);
for (int i = g.start[v]; i < g.start[v + 1]; i++) {
auto to = g.elist[i].to;
if (ord[to] == -1) {
self(self, to);
low[v] = std::min(low[v], low[to]);
} else {
low[v] = std::min(low[v], ord[to]);
}
}
if (low[v] == ord[v]) {
while (true) {
int u = visited.back();
visited.pop_back();
ord[u] = _n;
ids[u] = group_num;
if (u == v) break;
}
group_num++;
}
};
for (int i = 0; i < _n; i++) {
if (ord[i] == -1) dfs(dfs, i);
}
for (auto& x : ids) {
x = group_num - 1 - x;
}
return {group_num, ids};
}
std::vector<std::vector<int>> scc() {
auto ids = scc_ids();
int group_num = ids.first;
std::vector<int> counts(group_num);
for (auto x : ids.second) counts[x]++;
std::vector<std::vector<int>> groups(ids.first);
for (int i = 0; i < group_num; i++) {
groups[i].reserve(counts[i]);
}
for (int i = 0; i < _n; i++) {
groups[ids.second[i]].push_back(i);
}
return groups;
}
private:
int _n;
struct edge {
int to;
};
std::vector<std::pair<int, edge>> edges;
};
} // namespace internal
} // namespace atcoder
#include <cassert>
#include <vector>
namespace atcoder {
struct scc_graph {
public:
scc_graph() : internal(0) {}
scc_graph(int n) : internal(n) {}
void add_edge(int from, int to) {
int n = internal.num_vertices();
assert(0 <= from && from < n);
assert(0 <= to && to < n);
internal.add_edge(from, to);
}
std::vector<std::vector<int>> scc() { return internal.scc(); }
private:
internal::scc_graph internal;
};
} // namespace atcoder
using namespace atcoder;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000
int main(){
int N,M;
cin>>N>>M;
vector<int> a(N);
rep(i,N){
scanf("%d",&a[i]);
a[i]--;
}
rep(i,N-2){
if(a[i]==a[i+1]||a[i]==a[i+2]){
cout<<"No"<<endl;
return 0;
}
}
{
scc_graph G(M);
rep(i,N-2){
if(i%2==0){
G.add_edge(a[i],a[i+1]);
G.add_edge(a[i+2],a[i+1]);
}
else{
G.add_edge(a[i+1],a[i]);
G.add_edge(a[i+1],a[i+2]);
}
}
auto ret = G.scc();
if(ret.size()==M){
cout<<"Yes"<<endl;
vector<int> ans(M);
rep(i,ret.size()){
ans[ret[i][0]] = i+1;
}
rep(i,M){
if(i!=0)cout<<' ';
cout<<ans[i];
}
cout<<endl;
return 0;
}
}
{
scc_graph G(M);
rep(i,N-2){
if(i%2==1){
G.add_edge(a[i],a[i+1]);
G.add_edge(a[i+2],a[i+1]);
}
else{
G.add_edge(a[i+1],a[i]);
G.add_edge(a[i+1],a[i+2]);
}
}
auto ret = G.scc();
if(ret.size()==M){
cout<<"Yes"<<endl;
vector<int> ans(M);
rep(i,ret.size()){
ans[ret[i][0]] = i+1;
}
rep(i,M){
if(i!=0)cout<<' ';
cout<<ans[i];
}
cout<<endl;
return 0;
}
}
cout<<"No"<<endl;
return 0;
}
沙耶花