2020牛客國慶集訓派對day3

A Leftbest

#include <bits/stdc++.h>
//#define int ll
using namespace std;

#pragma GCC optimize(2)
//#define int ll
typedef long long ll;

set<int > a;

void solve() {
    ll sum=0;
    int n;
    cin>>n;
    for (int i = 0; i < n; ++i) {
        int x;
        cin>>x;
        a.insert(x);
        auto u = a.upper_bound(x);
        if (u!=a.end()){
            sum+=*u;
        }
    }
    cout<<sum;
}

signed main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int _ = 1;
    //cin >> _;
    while (_--) {
        solve();
    }
    return 0;
}
           

F Points

#include <bits/stdc++.h>
#define int ll
using namespace std;

#pragma GCC optimize(2)
//#define int ll
typedef long long ll;
const int maxn=3e5+10;

int a[maxn];

void solve() {
    int n;
    cin>>n;
    for (int i = 1; i < n; ++i) {
        int u,v;
        cin>>u>>v;
        a[u]++,a[v]++;
    }
    int sum=0;
    for (int j = 1; j < n+1; ++j) {
        if (a[j]==1) sum++;
    }
    cout<<sum;
}

signed main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int _ = 1;
    //cin >> _;
    while (_--) {
        solve();
    }
    return 0;
}
           

J Flowers

#include <bits/stdc++.h>
#define int ll
using namespace std;

#pragma GCC optimize(2)
//#define int ll
typedef long long ll;
const int maxn=3e5+10;

int a[maxn];
int n,m;

bool check(int mid){
    int sum=0;
    for (int i = 1; i <=n; ++i) {
        sum+=min(a[i],mid);
    }
    return mid*m<=sum;
}

void solve() {
    int sum=0,ans=0;
    cin>>n>>m;
    for (int i = 1; i <= n; ++i) {
        cin>>a[i],sum+=a[i];
    }
    int l=0,r=sum/m;
    while (l<=r){
        int mid = (l + r) >> 1;
        if (check(mid)) l=mid+1,ans=mid;
        else r=mid-1;
    }
    cout<<ans<<"\n";
}

signed main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int _ = 1;
    cin >> _;
    while (_--) {
        solve();
    }
    return 0;
}