結果
| 問題 |
No.161 制限ジャンケン
|
| コンテスト | |
| ユーザー |
koyumeishi
|
| 提出日時 | 2015-03-14 20:54:35 |
| 言語 | C++11(廃止可能性あり) (gcc 13.3.0) |
| 結果 |
AC
|
| 実行時間 | 6 ms / 5,000 ms |
| コード長 | 3,227 bytes |
| コンパイル時間 | 930 ms |
| コンパイル使用メモリ | 86,380 KB |
| 実行使用メモリ | 6,820 KB |
| 最終ジャッジ日時 | 2024-11-30 04:30:55 |
| 合計ジャッジ時間 | 1,697 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 16 |
ソースコード
#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <set>
using namespace std;
#define INF 1e9
typedef struct{
int to;
int cap;
int cost;
int rev;
}edge;
//min cost : s->t (flow:f)
//SPFA_fast version using SLF and LLL
int min_cost_flow(vector<vector<edge> > &G, int s, int t, int f){
const int N = G.size();
int cost = 0;
vector<int> prev_v(N,-1);
vector<int> prev_e(N,-1);
while(f>0){
//min distance(cost based) search with SPFA
vector<int> dist(N, INF);
vector<int> cnt(dist.size(), 0);
long long sum = 0;
dist[s] = 0;
prev_v[s] = s;
deque<int> Q;
auto my_push = [&](int node){
//SLF
if(Q.size() == 0 || dist[Q.front()] > dist[node]){
Q.push_front(node);
}else{
Q.push_back(node);
}
cnt[node]++;
};
auto my_pop = [&]() -> int{
int ret = Q.front();
cnt[ret]--;
Q.pop_front();
return ret;
};
auto adjust = [&](){
//LLL
double ave = 1.0*sum / Q.size();
if(Q.size() <= 1) return;
while( dist[Q.front()] > ave ){
Q.push_back( Q.front() );
Q.pop_front();
}
};
my_push(s);
while(!Q.empty()){
int pos = my_pop();
sum -= dist[pos];
for(int i=0; i<G[pos].size(); i++){
edge& E = G[pos][i];
if(dist[E.to] > dist[pos] + E.cost && E.cap > 0){
if(cnt[E.to] != 0){
sum -= dist[ E.to ];
}
dist[E.to] = dist[pos] + E.cost;
prev_v[ E.to ] = pos;
prev_e[ E.to ] = i;
sum += dist[E.to];
if(cnt[ E.to ] == 0){
my_push( E.to );
adjust();
}
}
}
}
//cannot achieved to "t" return -1
if(dist[t]>=INF) return -1;
//add cost of s->t with flow=d
int pos=t;
int d=INF;
while(pos!=s){
int i=prev_v[pos];
int j=prev_e[pos];
pos = i;
d = min(d, G[i][j].cap);
}
pos = t;
//cout << t ;
while(pos!=s){
int i=prev_v[pos];
int j=prev_e[pos];
G[i][j].cap -= d;
G[ G[i][j].to ][ G[i][j].rev ].cap += d;
//cost += G[i][j].cost * d;
pos = i;
//cout << " <- " << pos;
}
//cout << endl;
cost += d * dist[t];
f -= d;
//f==0 then end
}
return cost;
}
void add_edge(vector<vector<edge> > &G, int from, int to, int cap, int cost){
G[from].push_back((edge){to, cap, cost, (int)G[to].size()});
G[to].push_back((edge){from, 0, -cost, (int)G[from].size()-1});
}
int main(){
int G,C,P;
cin >> G >> C >> P;
string S;
cin >> S;
int n = S.size();
vector<vector<edge>> Graph(n + 3 + 2);
int s = n+3+0;
int t = n+3+1;
int g = n+0;
int c = n+1;
int p = n+2;
for(int i=0; i<n; i++){
if(S[i] == 'G'){
add_edge(Graph, g, i, 1, 3-1);
add_edge(Graph, c, i, 1, 3-0);
add_edge(Graph, p, i, 1, 3-3);
}else if(S[i] == 'C'){
add_edge(Graph, g, i, 1, 3-3);
add_edge(Graph, c, i, 1, 3-1);
add_edge(Graph, p, i, 1, 3-0);
}else if(S[i] == 'P'){
add_edge(Graph, g, i, 1, 3-0);
add_edge(Graph, c, i, 1, 3-3);
add_edge(Graph, p, i, 1, 3-1);
}
add_edge(Graph, i, t, 1, 0);
}
add_edge(Graph, s, g, G, 0);
add_edge(Graph, s, c, C, 0);
add_edge(Graph, s, p, P, 0);
int ans = 3*n - min_cost_flow(Graph, s, t, n);
cout << ans << endl;
return 0;
}
koyumeishi