結果
| 問題 | No.1324 Approximate the Matrix |
| コンテスト | |
| ユーザー |
carrot46
|
| 提出日時 | 2020-12-23 13:16:54 |
| 言語 | C++14 (gcc 15.2.0 + boost 1.89.0) |
| 結果 |
AC
|
| 実行時間 | 118 ms / 2,000 ms |
| コード長 | 4,953 bytes |
| 記録 | |
| コンパイル時間 | 2,464 ms |
| コンパイル使用メモリ | 192,016 KB |
| 実行使用メモリ | 6,784 KB |
| 最終ジャッジ日時 | 2024-09-21 16:22:43 |
| 合計ジャッジ時間 | 4,646 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 42 |
ソースコード
#include <bits/stdc++.h>
//#include <chrono>
#pragma GCC optimize("Ofast")
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()
using ll = long long;
using vec = vector<ll>;
using mat = vector<vec>;
ll N,M,H,W,Q,K,A,B;
string S;
using P = pair<ll, ll>;
const ll INF = (1LL<<60);
template<class T> bool chmin(T &a, const T &b){
if(a > b) {a = b; return true;}
else return false;
}
template<class T> bool chmax(T &a, const T &b){
if(a < b) {a = b; return true;}
else return false;
}
template<class T> void my_printv(std::vector<T> v,bool endline = true){
if(!v.empty()){
for(std::size_t i{}; i<v.size()-1; ++i) std::cout<<v[i]<<" ";
std::cout<<v.back();
}
if(endline) std::cout<<std::endl;
}
struct edge{
int to, cap, rev;
ll cost;
edge(){}
edge(int a, int b, ll c, int d){
to = a;
cap = b;
cost = c;
rev = d;
}
};
using ve = vector<edge>;
void add_edge(int from, int to, int cap, ll cost, vector<ve> &G, bool directed = true){
rep(_, (directed ? 1 : 2)) {
G[from].emplace_back(to, cap, cost, (int) G[to].size());
G[to].emplace_back(from, 0, -cost, (int) G[from].size() - 1);
swap(to, from);
}
}
bool bellman_ford_for_flow(int s, vector<ve> &G, vec &dist){
//O(|V|^2 + |V||E|)
dist[s] = 0;
int num(0), sz = G.size();
while(num++ < sz){
bool update = false;
rep(v, sz){
if(dist[v] != INF) {
for (edge &e : G[v]) {
if (e.cap > 0 && chmin(dist[e.to], dist[v] + e.cost)) update = true;
}
}
}
if(!update) return true;
}
return false; //failed
}
mat cost_v, cost_v_first;
void dijkstra_for_flow(int s, vector<ve> &G, vec &h, vec &dist, vector<int> &prev_v, vector<int> &prev_e){
typedef struct _comp{
ll cost;
int v;
_comp(){}
_comp(ll a, int b){
cost = a;
v = b;
}
bool operator > (const _comp a){
return cost > a.cost;
}
} mp;
priority_queue<mp, vector<mp>, greater<> > pque;
dist[s] = 0;
pque.emplace(0, s);
while(!pque.empty()){
mp p = pque.top(); pque.pop();
if(dist[p.v] < p.cost) continue;
rep(i, (int)G[p.v].size()){
edge &e = G[p.v][i];
if(p.v < N * 2 && e.to < N * 2){
e.cost = (p.v < e.to ? cost_v.at(p.v).at(e.to - N) : -cost_v.at(e.to).at(p.v - N) + 2);
}
if(e.cap > 0 && chmin(dist[e.to], p.cost + e.cost + h[p.v] - h[e.to])){
prev_v[e.to] = p.v;
prev_e[e.to] = i;
pque.emplace(dist[e.to], e.to);
}
}
}
}
//全然Validateできていないので注意
ll min_cost_flow(int s, int t, int f, vector<ve> &G, bool minus_exist = true){
//minus_exist : if (edge.cost < 0)
//for graph without negative cycles
int sz = G.size();
ll res(0);
vector<int> prev_v(sz), prev_e(sz);
vec h(sz, minus_exist ? INF : 0);
if(minus_exist && (!bellman_ford_for_flow(s, G, h) || h[t] == INF)) return -1;
while(f > 0){
vec dist(sz, INF);
dijkstra_for_flow(s, G, h, dist, prev_v, prev_e);
if(dist[t] == INF) return -1;
rep(v, sz) h[v] += dist[v];
int d = f;
for(int v = t; v != s; v = prev_v[v]){
chmin(d, G[prev_v[v]][prev_e[v]].cap);
}
f -= d;
res += h[t] * d;
for(int v = t; v != s; v = prev_v[v]){
edge &e = G[prev_v[v]][prev_e[v]];
if(v < N * 2 && prev_v[v] < N * 2){
int u = prev_v[v];
if(u < v) {
cost_v[u][v - N] += 2;
G[v][e.rev].cap = 1;
}else {
cost_v[v][u - N] -= 2;
if (cost_v[v][u - N] == cost_v_first[v][u - N]){
e.cap = 0;
}
}
}else {
e.cap -= d;
G[v][e.rev].cap += d;
}
}
}
return res;
}
int main(){
cin.tie(nullptr);
ios::sync_with_stdio(false);
cin>>N>>K;
const int st = N * 2, gl = N * 2 + 1;
vector<ve> G(N * 2 + 2);
rep(i, N){
cin>>A;
add_edge(st, i, A, 0, G);
}
rep(i, N){
cin>>A;
add_edge(i+N, gl, A, 0, G);
}
ll sum = - (K * 400);
cost_v.resize(N);
rep(i, N){
cost_v[i].resize(N);
reps(j, N, N*2){
cin>>A;
sum += A * A;
cost_v[i][j-N] = 400 - A * 2 + 1;
add_edge(i, j, 1, 0, G);
}
}
cost_v_first = cost_v;
cout<<sum + min_cost_flow(st, gl, (int)K, G, false)<<endl;
}
carrot46