# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
582077 | FatihSolak | Marriage questions (IZhO14_marriage) | C++17 | 1600 ms | 1744 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define N 30005
using namespace std;
vector<int> adj[N];
int mt[N];
int l,r;
bool vis[N];
void reset(int x){
for(int i = 0;i<=x;i++){
vis[i] = 0;
}
}
bool try_kuhn(int v){
if(vis[v])
return 0;
vis[v] = 1;
for(auto u:adj[v]){
if(u < l || r < u)continue;
if(mt[u] == 0 || try_kuhn(mt[u])){
mt[u] = v;
return 1;
}
}
return 0;
}
void solve(){
int n,m,k;
cin >> n >> m >> k;
for(int i = 1;i<=k;i++){
int u,v;
cin >> u >> v;
adj[v].push_back(u);
}
vector<int> unmatched;
for(int i = 1;i<=m;i++){
unmatched.push_back(i);
}
r = 0;
int ans = 0;
for(int i = 1;i<=n;i++){
l = i;
r = max(r,i+m-1);
reset(m);
while(unmatched.size() && try_kuhn(unmatched.back())){
reset(m);
unmatched.pop_back();
}
while(r != n && unmatched.size()){
r++;
reset(m);
while(unmatched.size() && try_kuhn(unmatched.back())){
reset(m);
unmatched.pop_back();
}
}
if(r == n && unmatched.size())break;
ans += n - r + 1;
if(mt[i]){
unmatched.push_back(mt[i]);
}
}
cout << ans;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
#ifdef Local
freopen("in.txt","r",stdin);
freopen("out.txt","w",stdout);
#endif
int t = 1;
//cin >> t;
while(t--){
solve();
}
#ifdef Local
cout << endl << fixed << setprecision(2) << 1000.0*clock()/CLOCKS_PER_SEC << " milliseconds.";
#endif
}
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