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## Discussion of Problem 1109. Conference

Why WA4?
Posted by JamesBond_007 25 Oct 2016 14:22
#include <iostream>
#include <vector>
#include <set>
using namespace std;
set < pair <int, int> > S;
set < pair <int, int> > :: iterator it;
vector <int> A[1111], B[1111];
int n, k, m, x[1111], y[1111], res, X[1111], Y[1111];
bool used[111111];
void cut_x(int v){
for (int i = 0; i < k; i ++){
if(!used[i] && X[i] == v && y[Y[i]] > 1){used[i] = true; y[Y[i]] --; res --;}
}
}
void cut_y(int v){
for (int i = 0; i < k; i ++){
if(!used[i] && Y[i] == v && x[X[i]] > 1){used[i] = true; x[X[i]] --; res --;}
}
}
int main(){
cin >> n >> m >> k;
res = k;
for (int i = 0; i < k; i ++){
int u, v;
cin >> X[i] >> Y[i];
A[X[i]].push_back(Y[i]);
B[Y[i]].push_back(X[i]);
x[X[i]] ++; y[Y[i]] ++;
}
for (int i = 1; i <= n; i ++)
S.insert(make_pair(x[i], i));
for (it = S.begin(); it != S.end(); it ++){
pair <int, int> v = *it;
if(v.first == 1){
cut_y(A[v.second][0]);
}else{
cut_x(v.second);
}
}
cout << res;
}
Re: Why WA4?
Posted by JamesBond_007 25 Oct 2016 14:23
Help me?
Re: Why WA4?
Posted by Freopen 18 Apr 2017 10:20
Bipartite graph
Re: Why WA4?
Posted by Husayn Hasanov 8 Dec 2017 16:23
Your idea has bug you have to think again clearly!