Submission #443019

#	Time	Username	Problem	Language	Result	Execution time	Memory
443019		leaked	Marriage questions (IZhO14_marriage)	C++14	14 / 100	27 ms	1824 KiB

marriage

#include <bits/stdc++.h>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("-O3")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define vec vector
#define sz(x) ( int)x.size()
#define m_p make_pair
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
using namespace std;
typedef long long ll;
typedef pair<ll, int> pli;
typedef pair<int,ll> pil;
typedef pair<int,int> pii;
typedef unsigned long long ull;
auto rng=bind(uniform_int_distribution<int>(1,1000),mt19937(time(0)));
template<class T> bool umax(T &a,const T &b){return (a<b?a=b,1:0);}
template<class T> bool umin(T &a,const T &b){return (a>b?a=b,1:0);}
const int N=3e4+1;
const int K=165;
const int M=2001;
vec<int> g[N];
int mt[N];
int wh[N];
int u[N],tt,n,m;
int tl,tr;
bool kuhn(int v){
    if(u[v]==tt) return 0;
    u[v]=tt;
    for(auto &z : g[v]){
        if(z>=tl && z<=tr && mt[z]==-1){
            mt[z]=v;
            wh[v]=z;
            return 1;
        }
    }
    for(auto &z : g[v]){
        if(z>=tl && z<=tr && kuhn(mt[z])){
            mt[z]=v;
            wh[v]=z;
            return 1;
        }
    }
    return 0;
}
int check(int l,int r){
    tl=l;tr=r;
    for(int i=0;i<m;i++){
        if(wh[i]==-1) continue;
        mt[wh[i]]=-1;
        wh[i]=-1;
    }
    for(int i=0;i<m;i++){
        tt++;
        if(!kuhn(i)) return 0;
    }
    return 1;
}
signed main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int k;
    cin>>n>>m>>k;
    for(int i=0;i<k;i++){
        int v,u;
        cin>>v>>u;--v;--u;
        g[u].pb(v);
    }
    for(int i=0;i<N;i++){
        mt[i]=-1;
        wh[i]=-1;
    }
    int l=0,r=n;
    while(l!=r){
        int tm=(l+r)>>1;
        if(check(tm,-1)) l=tm+1;
        else r=tm;
    }
    l--;
    r=n-1;
    ll ans=0;
//    cout<<check(1,4);
    for(int i=l;i>=0;i--){
//        cerr<<i<<' '<<r<<endl;
        while(check(i,r-1)) r--;
//        cout<<i<<' '<<r<<endl;
        ans+=(n-r);
    }
    cout<<ans;
    return 0;
}

/*
5
1 2
2 3
3 4
4 5
5 1
*/

• Subtask 1: 14 / 100