結果
| 問題 |
No.1194 Replace
|
| コンテスト | |
| ユーザー |
theory_and_me
|
| 提出日時 | 2020-08-24 15:20:54 |
| 言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 1,216 ms / 2,000 ms |
| コード長 | 4,528 bytes |
| コンパイル時間 | 13,563 ms |
| コンパイル使用メモリ | 287,672 KB |
| 最終ジャッジ日時 | 2025-01-13 13:24:36 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 27 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for(ll i=0;i<(ll)n;i++)
#define dump(x) cerr << #x << " = " << (x) << endl;
#define spa << " " <<
#define fi first
#define se second
#define ALL(a) (a).begin(),(a).end()
#define ALLR(a) (a).rbegin(),(a).rend()
using ld = long double;
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pll = pair<long, long>;
using pdd = pair<ld, ld>;
template<typename T> struct V : vector<T> { using vector<T>::vector; };
V() -> V<ll>;
V(size_t) -> V<ll>;
template<typename T> V(size_t, T) -> V<T>;
template<typename T> vector<T> make_vec(size_t n, T a) { return vector<T>(n, a); }
template<typename... Ts> auto make_vec(size_t n, Ts... ts) { return vector<decltype(make_vec(ts...))>(n, make_vec(ts...)); }
template<class S, class T> ostream& operator << (ostream& os, const pair<S, T> v){os << "(" << v.first << ", " << v.second << ")"; return os;}
template<typename T> ostream& operator<<(ostream &os, const vector<T> &v) { for (auto &e : v) os << e << ' '; return os; }
template<class T> ostream& operator<<(ostream& os, const vector<vector<T>> &v){ for(auto &e : v){os << e << "\n";} return os;}
struct fast_ios { fast_ios(){ cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
void fail() { cout << -1 << '\n'; exit(0); }
inline int popcount(const int x) { return __builtin_popcount(x); }
inline int popcount(const ll x) { return __builtin_popcountll(x); }
template<typename T> void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++)
{cerr<<v[i][0];for(ll j=1;j<w;j++)cerr spa v[i][j];cerr<<endl;}};
template<typename T> void debug(vector<T>&v,ll n){if(n!=0)cerr<<v[0];
for(ll i=1;i<n;i++)cerr spa v[i];
cerr<<endl;};
const ll INF = (1ll<<62);
// const ld EPS = 1e-10;
// const ld PI = acos(-1.0);
const ll mod = (int)1e9 + 7;
//const ll mod = 998244353;
using Graph = V<V<ll>>;
template< typename G >
struct StronglyConnectedComponents {
const G &g;
Graph gg, rg;
vector< int > comp, order, used;
StronglyConnectedComponents(G &g) : g(g), gg(g.size()), rg(g.size()), comp(g.size(), -1), used(g.size()) {
for(int i = 0; i < (int)g.size(); i++) {
for(auto e : g[i]) {
gg[i].emplace_back((int) e);
rg[(int) e].emplace_back(i);
}
}
}
int operator[](int k) {
return comp[k];
}
void dfs(int idx) {
if(used[idx]) return;
used[idx] = true;
for(int to : gg[idx]) dfs(to);
order.push_back(idx);
}
void rdfs(int idx, int cnt) {
if(comp[idx] != -1) return;
comp[idx] = cnt;
for(int to : rg[idx]) rdfs(to, cnt);
}
void build(Graph &t) {
for(int i = 0; i < (int)gg.size(); i++) dfs(i);
reverse(begin(order), end(order));
int ptr = 0;
for(int i : order) if(comp[i] == -1) rdfs(i, ptr), ptr++;
t.resize(ptr);
for(int i = 0; i < (int)g.size(); i++) {
for(auto &to : g[i]) {
int x = comp[i], y = comp[to];
if(x == y) continue;
t[x].push_back(y);
}
}
}
};
int main(){
ll N, M;
cin >> N >> M;
ll res = 0;
res += N * (N+1) / 2;
V<ll> B(M), C(M);
REP(i, M){
cin >> B[i] >> C[i];
}
set<ll> st;
REP(i, M){
st.insert(B[i]);
st.insert(C[i]);
}
map<ll, ll> mp;
ll cnt = 0;
V<ll> score;
for(auto x: st){
mp[x] = cnt;
score.push_back(x);
cnt++;
res -= x;
}
ll K = cnt;
Graph G(K), T;
REP(i, M){
G[mp[B[i]]].push_back(mp[C[i]]);
}
for(auto &v: G){
sort(ALL(v));
v.erase(unique(ALL(v)), v.end());
}
StronglyConnectedComponents<Graph> scc(G);
scc.build(T);
ll S = T.size();
for(auto &v: T){
sort(ALL(v));
v.erase(unique(ALL(v)), v.end());
}
V<ll> ma(S, 0), sz(S, 0);
REP(i, K){
chmax(ma[scc[i]], score[i]);
sz[scc[i]]++;
}
V<ll> dp(S, -1);
// dump(S)
auto rec = [&](auto self, ll now){
if(dp[now]>=0) return dp[now];
ll val = ma[now];
for(auto next: T[now]){
ll tmp = self(self, next);
chmax(val, tmp);
}
dp[now] = val;
res += val * sz[now];
return val;
};
REP(i, S) rec(rec, i);
cout << res << endl;
return 0;
}
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