結果
問題 | No.421 しろくろチョコレート |
ユーザー |
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提出日時 | 2020-12-15 16:27:05 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 4 ms / 2,000 ms |
コード長 | 4,006 bytes |
コンパイル時間 | 2,103 ms |
コンパイル使用メモリ | 182,988 KB |
実行使用メモリ | 6,944 KB |
最終ジャッジ日時 | 2024-09-23 07:30:50 |
合計ジャッジ時間 | 3,628 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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ファイルパターン | 結果 |
---|---|
other | AC * 65 |
ソースコード
//#pragma GCC target("avx2")//#pragma GCC optimize("O3")//#pragma GCC optimize("unroll-loops")#include <bits/stdc++.h>#define ll long long#define ld long double#define rep(i, n) for(ll i = 0; i < n; ++i)#define rep2(i, a, b) for(ll i = a; i <= b; ++i)#define rrep(i, a, b) for(ll i = a; i >= b; --i)#define pii pair<int, int>#define pll pair<ll, ll>#define fi first#define se second#define pb push_back#define eb emplace_back#define vi vector<int>#define vll vector<ll>#define vpii vector<pii>#define vpll vector<pll>#define all(a) a.begin(), a.end()#define rall(a) a.rbegin(), a.rend()#define endl '\n'using namespace std;template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }//const int MOD=1000000007;const int MOD=998244353;const ll INF=9223372036854775807;const int inf=2147483647;const double PI=acos(-1);int dx[8] = {1,0,-1,0,1,1,-1,-1};int dy[8] = {0,1,0,-1,-1,1,1,-1};const int MAX = 310000;template< typename flow_t >struct Dinic {const flow_t INF;struct edge {int to;flow_t cap;int rev;bool isrev;int idx;};vector< vector< edge > > graph;vector< int > min_cost, iter;Dinic(int V) : INF(numeric_limits< flow_t >::max()), graph(V) {}void add_edge(int from, int to, flow_t cap, int idx = -1) {graph[from].emplace_back((edge) {to, cap, (int) graph[to].size(), false, idx});graph[to].emplace_back((edge) {from, 0, (int) graph[from].size() - 1, true, idx});}bool bfs(int s, int t) {min_cost.assign(graph.size(), -1);queue< int > que;min_cost[s] = 0;que.push(s);while(!que.empty() && min_cost[t] == -1) {int p = que.front();que.pop();for(auto &e : graph[p]) {if(e.cap > 0 && min_cost[e.to] == -1) {min_cost[e.to] = min_cost[p] + 1;que.push(e.to);}}}return min_cost[t] != -1;}flow_t dfs(int idx, const int t, flow_t flow) {if(idx == t) return flow;for(int &i = iter[idx]; i < graph[idx].size(); i++) {edge &e = graph[idx][i];if(e.cap > 0 && min_cost[idx] < min_cost[e.to]) {flow_t d = dfs(e.to, t, min(flow, e.cap));if(d > 0) {e.cap -= d;graph[e.to][e.rev].cap += d;return d;}}}return 0;}flow_t max_flow(int s, int t) {flow_t flow = 0;while(bfs(s, t)) {iter.assign(graph.size(), 0);flow_t f = 0;while((f = dfs(s, t, INF)) > 0) flow += f;}return flow;}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 << "/" << e.cap + rev_e.cap << ")" << endl;}}}};signed main(){cin.tie(0);ios::sync_with_stdio(false);int n, m;cin >> n >> m;vector<string> a(n);rep(i,n) cin >> a[i];Dinic<int> G(n*m+2);int s = n*m, t = n*m+1;rep(i,n)rep(j,m){if((i+j)%2 || a[i][j] == '.')continue;int u = i*m+j;int v;if(i && a[i-1][j] != '.'){v = (i-1)*m+j;G.add_edge(u,v,1);}if(j && a[i][j-1] != '.'){v = i*m+(j-1);G.add_edge(u,v,1);}if(i+1<n && a[i+1][j] != '.'){v = (i+1)*m+j;G.add_edge(u,v,1);}if(j+1<m && a[i][j+1] != '.'){v = i*m+(j+1);G.add_edge(u,v,1);}}int cntw = 0, cntb = 0;rep(i,n)rep(j,m){if(a[i][j] == '.')continue;int u = i*m+j;if((i+j)%2 == 0){G.add_edge(s,u,1);cntw++;}else{G.add_edge(u,t,1);cntb++;}}int mx = G.max_flow(s,t);cntw -= mx; cntb -= mx;int ans = 100*mx+ 10*min(cntw,cntb) + max(cntw,cntb) - min(cntw,cntb);cout << ans << endl;return 0;}