結果
| 問題 |
No.421 しろくろチョコレート
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-03-27 23:10:30 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 14 ms / 2,000 ms |
| コード長 | 3,555 bytes |
| コンパイル時間 | 1,973 ms |
| コンパイル使用メモリ | 186,448 KB |
| 実行使用メモリ | 6,948 KB |
| 最終ジャッジ日時 | 2024-09-23 07:23:06 |
| 合計ジャッジ時間 | 3,641 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| other | AC * 65 |
ソースコード
#include <bits/stdc++.h>
#define FOR(v, a, b) for(int v = (a); v < (b); ++v)
#define FORE(v, a, b) for(int v = (a); v <= (b); ++v)
#define REP(v, n) FOR(v, 0, n)
#define REPE(v, n) FORE(v, 0, n)
#define REV(v, a, b) for(int v = (a); v >= (b); --v)
#define ALL(x) (x).begin(), (x).end()
#define ITR(it, c) for(auto it = (c).begin(); it != (c).end(); ++it)
#define RITR(it, c) for(auto it = (c).rbegin(); it != (c).rend(); ++it)
#define EXIST(c,x) ((c).find(x) != (c).end())
#define LLI long long int
#define fst first
#define snd second
#ifdef DEBUG
#include <misc/C++/Debug.cpp>
#else
#define dump(x) ((void)0)
#endif
using namespace std;
#define gcd __gcd
template <class T> constexpr T lcm(T m, T n){return m/gcd(m,n)*n;}
template <typename I> void join(ostream &ost, I s, I t, string d=" "){for(auto i=s; i!=t; ++i){if(i!=s)ost<<d; ost<<*i;}ost<<endl;}
template <typename T> istream& operator>>(istream &is, vector<T> &v){for(auto &a : v) is >> a; return is;}
template <typename T, typename U> istream& operator>>(istream &is, pair<T,U> &p){is >> p.first >> p.second; return is;}
template <typename T, typename U> T& chmin(T &a, const U &b){return a = (a<=b?a:b);}
template <typename T, typename U> T& chmax(T &a, const U &b){return a = (a>=b?a:b);}
template <typename T, size_t N, typename U> void fill_array(T (&a)[N], const U &v){fill((U*)a, (U*)(a+N), v);}
template <typename T, T INF> class FordFulkerson{
struct edge{
int to, rev;
T cap;
};
int size;
vector<vector<edge>> graph;
vector<bool> visit;
T dfs(int from, int to, T flow){
if(from == to) return flow;
visit[from] = true;
for(auto &e : graph[from]){
if(!visit[e.to] and e.cap > 0){
T d = dfs(e.to, to, min(flow, e.cap));
if(d > 0){
e.cap -= d;
graph[e.to][e.rev].cap += d;
return d;
}
}
}
return 0;
}
public:
FordFulkerson(int size): size(size), graph(size), visit(size){}
void add_edge(int from, int to, const T &cap){
graph[from].push_back((edge){to, (int)graph[to].size(), cap});
graph[to].push_back((edge){from, (int)graph[from].size()-1, 0});
}
T max_flow(int s, int t){
T ret = 0;
while(1){
visit.assign(size,false);
T flow = dfs(s,t,INF);
if(flow == 0) return ret;
ret += flow;
}
}
};
class BipartiteMatching{
public:
int x, y;
FordFulkerson<int,INT_MAX> mflow;
int s, t;
BipartiteMatching(int x, int y): x(x), y(y), mflow(x+y+2), s(x+y), t(s+1){
REP(i,x) mflow.add_edge(s,i,1);
REP(i,y) mflow.add_edge(x+i,t,1);
}
void add_edge(int i, int j){
mflow.add_edge(i,x+j,1);
}
int matching(){
return mflow.max_flow(s,t);
}
};
const int dir4[4][2] = {{1,0},{-1,0},{0,1},{0,-1}};
int main(){
cin.tie(0);
ios::sync_with_stdio(false);
int N,M;
while(cin >> N >> M){
vector<string> S(N); cin >> S;
int c = 0;
REP(i,N) REP(j,M) if(S[i][j] != '.') ++c;
vector<vector<int>> w(N, vector<int>(M,-1)), b(N, vector<int>(M,-1));
int cw=0, cb=0;
REP(i,N) REP(j,M){
if(S[i][j] == 'w') w[i][j] = cw++;
if(S[i][j] == 'b') b[i][j] = cb++;
}
BipartiteMatching bm(cw,cb);
REP(i,N){
REP(j,M){
for(auto &d : dir4){
int y=i+d[0], x=j+d[1];
if(y<0 or y>=N or x<0 or x>=M) continue;
if(S[i][j] == 'w' and S[y][x] == 'b') bm.add_edge(w[i][j], b[y][x]);
}
}
}
int mat = bm.matching();
int pr = min(cw-mat,cb-mat);
int ans = mat*100 + pr*10 + (cw-mat-pr) + (cb-mat-pr);
cout << ans << endl;
}
return 0;
}