結果
| 問題 |
No.1420 国勢調査 (Easy)
|
| コンテスト | |
| ユーザー |
Ahykw
|
| 提出日時 | 2021-03-16 00:22:46 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 52 ms / 2,000 ms |
| コード長 | 4,526 bytes |
| コンパイル時間 | 2,891 ms |
| コンパイル使用メモリ | 203,816 KB |
| 実行使用メモリ | 5,248 KB |
| 最終ジャッジ日時 | 2024-11-07 12:57:45 |
| 合計ジャッジ時間 | 6,372 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 30 |
コンパイルメッセージ
main.cpp: In function 'int main_naive()':
main.cpp:180:1: warning: control reaches end of non-void function [-Wreturn-type]
180 | }
| ^
ソースコード
#pragma GCC optimize("O3")
//#pragma GCC target("avx2")
//#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ld> vld;
typedef pair<ll,ll> Pll;
typedef pair<int,int> Pin;
ll INF = 1e16;
int inf = 1e9;
#define ALL(x) (x).begin(), (x).end()
#define FOR(i, m, n) for (ll i = (m); i < (n); ++i)
#define REVFOR(i, m, n) for (ll i = (n - 1); i >= (m); --i)
#define REP(i, n) FOR(i, 0, n)
#define REVREP(i, n) REVFOR(i, 0, n)
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define bcnt __builtin_popcountll
#ifdef LOCAL
#include <prettyprint.hpp>
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]: ", d_err(__VA_ARGS__);
#else
#define debug(...) 83;
#endif
void d_err() {
cerr << endl;
}
template <typename H, typename... T>
void d_err(H h, T... t) {
cerr << h << " ";
d_err(t...);
}
template <typename T>
void print(T x) {
cout << x << "\n";
}
template <typename T>
void print(vector<T>& x) {
int N = x.size();
REP(i, N) {
if (i > 0) cout << " ";
cout << x[i];
}
cout << "\n";
}
template<typename T>
struct UnionFind {
typedef function<T(T, T)> OP;
vector<int> par;
vector<T> diff_weight;
OP accum_op;
OP diff_op;
function<T(T)> neg_op;
UnionFind(int n,
/// ↓ edit!!!
OP accum_op=[](T a, T b) {return a + b;},
OP diff_op=[](T a, T b) {return a - b;},
function<T(T)> neg_op=[](T a) {return -a;},
T unity=0
): accum_op(accum_op), diff_op(diff_op), neg_op(neg_op) { init(n, unity); }
void init(int n, T unity=0) {
par.assign(n, -1);
diff_weight.assign(n, unity);
}
int root(int x) {
if (par[x] < 0) return x;
int r = root(par[x]);
diff_weight[x] = accum_op(diff_weight[x], diff_weight[par[x]]);
return par[x] = r;
}
int issame(int x, int y) {
return root(x) == root(y);
}
T weight(int x) {
root(x);
return diff_weight[x];
}
// update with diff_op(weight(y), weight(x)) = w
bool merge(int x, int y, T w = 0) {
w = accum_op(w, weight(x));
w = diff_op(w, weight(y));
x = root(x); y = root(y);
if (x == y) return false;
// merge by size
// force size of x to be bigger than that of y
if (par[x] > par[y]) swap(x, y), w = neg_op(w);
par[x] += par[y];
par[y] = x;
diff_weight[y] = w;
return true;
}
T diff(int x, int y) {
return diff_op(weight(y), weight(x));
}
ll size(int x) {
return -par[root(x)];
}
};
int main_naive(){
cin.tie(0);
ios_base::sync_with_stdio(false);
cout << fixed << setprecision(20);
int n, m; cin >> n >> m;
vll ans(n, -1);
vll a(m), b(m), y(m);
vector<vector<Pll>> edge(n);
REP(i, m) {
cin >> a[i] >> b[i];
cin >> y[i];
a[i]--, b[i]--;
edge[a[i]].eb(b[i], y[i]);
edge[b[i]].eb(a[i], y[i]);
}
vector<bool> used(n, false);
REP(i, n) {
if (used[i]) continue;
ans[i] = 1;
queue<int> q;
q.push(i);
while(not q.empty()) {
auto j = q.front(); q.pop();
for (auto &e: edge[j]) {
if (used[e.fi]) continue;
int v = ans[j] ^ e.se;
ans[e.fi] = v;
q.push(e.fi);
used[e.fi] = true;
}
}
}
REP(i, m) {
if ((ans[a[i]] ^ ans[b[i]]) != y[i]) {
print(-1);
return 0;
}
}
for(auto &e: ans) {
print(e);
}
}
int main() {
cin.tie(0);
ios_base::sync_with_stdio(false);
cout << fixed << setprecision(20);
int n, m; cin >> n >> m;
UnionFind<ll> uf(n,
[](ll a, ll b) {return a ^ b;},
[](ll a, ll b) {return a ^ b;},
[](ll a) {return a;});
REP(i, m) {
int a, b; cin >> a >> b;
a--, b--;
ll y; cin >> y;
if (uf.issame(a, b)) {
if (uf.diff(a, b) != y) {
print(-1);
return 0;
}
} else {
uf.merge(a, b, y);
}
}
REP(i, n) {
print(uf.weight(i));
}
}
Ahykw