Created
September 27, 2018 17:02
-
-
Save tmt514/0df9ee5325764dbdab8aa4e6d5da8d5d to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <bits/stdc++.h> | |
using namespace std; | |
struct Graph { | |
int n, source, sink; | |
vector<vector<int>> c; | |
void Initialize(int _n) { | |
n = _n; | |
c = vector<vector<int>>(n, vector<int>(n, 0)); | |
} | |
int FindMaxFlow() { | |
vector<int> p; | |
vector<int> visited(n, 0); | |
int total_flow = 0; | |
while (FindPath(source, p, visited)) { | |
int delta = c[p[0]][p[1]]; | |
for (int i = 0; i+1 < p.size(); i++) | |
delta = min(delta, c[p[i]][p[i+1]]); | |
for (int i = 0; i+1 < p.size(); i++) { | |
c[p[i]][p[i+1]] -= delta; | |
c[p[i+1]][p[i]] += delta; | |
} | |
total_flow += delta; | |
visited = vector<int>(n, 0); | |
p.clear(); | |
} | |
return total_flow; | |
} | |
// Use DFS find a path, returns true if there exists such a path. | |
bool FindPath(int x, vector<int>& p, vector<int>& visited) { | |
p.push_back(x); | |
visited[x] = 1; | |
if (x == sink) { | |
return true; | |
} | |
for (int y = 0; y < n; y++) | |
if (c[x][y] > 0 && visited[y] == 0 && FindPath(y, p, visited)) | |
return true; | |
p.pop_back(); | |
return false; | |
} | |
}; | |
map<string, int> names; | |
int ReadState() { | |
string s; | |
cin >> s; | |
if (names.find(s) == names.end()) { | |
int t = names.size(); | |
names[s] = t; | |
} | |
return names[s]; | |
} | |
int main(void) { | |
Graph g; | |
int s, r, f, t; | |
cin >> s >> r >> f >> t; | |
g.Initialize(2+s+t*2); | |
g.source = 0; | |
g.sink = 1; | |
vector<int> supplier, factory, company[1005]; | |
for(int i=0;i<r;i++) supplier.push_back(ReadState()); | |
for(int i=0;i<f;i++) factory.push_back(ReadState()); | |
for(int i=0;i<t;i++) { | |
int n; | |
cin >> n; | |
for(int j=0;j<n;j++) { | |
int x = ReadState(); | |
company[x].push_back(i); | |
} | |
} | |
for(int i=0;i<t;i++) g.c[i+2+s][i+t+2+s] = 1; | |
for(int i=0;i<s;i++) | |
for(auto j : company[i]) | |
for(auto k : company[i]) | |
if (j!=k) { g.c[j+t+2+s][k+2+s] = 1; } | |
for(auto j : supplier) g.c[0][2+j] = 1; | |
for(auto j : factory) g.c[2+j][1] = 1; | |
for(auto j : supplier) | |
for(auto k : company[j]) | |
g.c[2+j][2+s+k] = 1; | |
for(auto j : factory) | |
for(auto k : company[j]) | |
g.c[2+s+k+t][2+j] = 1; | |
int ans = g.FindMaxFlow(); | |
cout << ans << endl; | |
return 0; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment