結果
| 問題 |
No.798 コレクション
|
| コンテスト | |
| ユーザー |
kyort0n
|
| 提出日時 | 2019-03-15 22:19:41 |
| 言語 | C++11(廃止可能性あり) (gcc 13.3.0) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 3,448 bytes |
| コンパイル時間 | 1,544 ms |
| コンパイル使用メモリ | 174,060 KB |
| 実行使用メモリ | 121,936 KB |
| 最終ジャッジ日時 | 2024-07-01 21:07:52 |
| 合計ジャッジ時間 | 5,641 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 10 TLE * 1 -- * 12 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> l_l;
#define EPS (1e-7)
//#define INF (1e9)
#define PI (acos(-1))
//const ll mod = 1000000007;
template< typename flow_t, typename cost_t >
struct PrimalDual {
const cost_t INF;
struct edge {
int to;
flow_t cap;
cost_t cost;
int rev;
bool isrev;
};
vector< vector< edge > > graph;
vector< cost_t > potential, min_cost;
vector< int > prevv, preve;
PrimalDual(int V) : graph(V), INF(numeric_limits< cost_t >::max()) {}
void add_edge(int from, int to, flow_t cap, cost_t cost) {
graph[from].emplace_back((edge) {to, cap, cost, (int) graph[to].size(), false});
graph[to].emplace_back((edge) {from, 0, -cost, (int) graph[from].size() - 1, true});
}
cost_t min_cost_flow(int s, int t, flow_t f) {
int V = (int) graph.size();
cost_t ret = 0;
using Pi = pair< cost_t, int >;
priority_queue< Pi, vector< Pi >, greater< Pi > > que;
potential.assign(V, 0);
preve.assign(V, -1);
prevv.assign(V, -1);
while(f > 0) {
min_cost.assign(V, INF);
que.emplace(0, s);
min_cost[s] = 0;
while(!que.empty()) {
Pi p = que.top();
que.pop();
if(min_cost[p.second] < p.first) continue;
for(int i = 0; i < graph[p.second].size(); i++) {
edge &e = graph[p.second][i];
cost_t nextCost = min_cost[p.second] + e.cost + potential[p.second] - potential[e.to];
if(e.cap > 0 && min_cost[e.to] > nextCost) {
min_cost[e.to] = nextCost;
prevv[e.to] = p.second, preve[e.to] = i;
que.emplace(min_cost[e.to], e.to);
}
}
}
if(min_cost[t] == INF) return -1;
for(int v = 0; v < V; v++) potential[v] += min_cost[v];
flow_t addflow = f;
for(int v = t; v != s; v = prevv[v]) {
addflow = min(addflow, graph[prevv[v]][preve[v]].cap);
}
f -= addflow;
ret += addflow * potential[t];
for(int v = t; v != s; v = prevv[v]) {
edge &e = graph[prevv[v]][preve[v]];
e.cap -= addflow;
graph[v][e.rev].cap += addflow;
}
}
return ret;
}
void output() {
for(int i = 0; i < graph.size(); i++) {
for(auto &e : graph[i]) {
if(e.isrev) continue;
auto &rev_e = graph[e.to][e.rev];
cout << i << "->" << e.to << " (flow: " << rev_e.cap << "/" << rev_e.cap + e.cap << ")" << endl;
}
}
}
};
int main() {
//cout.precision(10);
cin.tie(0);
ios::sync_with_stdio(false);
ll n;
cin >> n;
ll MAX_DAY = n - n / 3;
PrimalDual<ll, ll> field(4e5);
for(ll day = 0; day < MAX_DAY; day++) {
field.add_edge(0, 1e5 + day, 1, 0);
}
for(ll item = 1; item <= n; item++) {
ll a, b;
cin >> a >> b;
for(ll day = 0; day <= MAX_DAY; day++) {
field.add_edge(1e5+day, 2e5+item, 1, a+b*day);
}
field.add_edge(2e5+item, 3e5, 1, 0);
}
cout << field.min_cost_flow(0, 3e5, MAX_DAY) << endl;
return 0;
}
kyort0n