2024年12月18日下午测试

#include<bits/stdc++.h>//100 

#define int long long

using namespace std;

int n,q;
int a[200005];
int x,y;

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
//	freopen("b.in","r",stdin);
//	freopen("b.out","w",stdout);
	cin >> n >> q;
	for(int i=1;i<=n;++i)cin >> a[i];
	sort(a+1,a+n+1);
	while(q--)
	{
		cin >> x >> y;
		int ans=0;
		for(int i=n-x+1;i<=n-x+y;++i)
		{
			ans+=a[i];
		}
		cout << ans << "\n"; 
	} 
	return 0;
}

#include<bits/stdc++.h>//100 

#define int long long

using namespace std;

int n,q;
int a[200005],cnt[200005];
int x,y;

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
//	freopen("b.in","r",stdin);
//	freopen("b.out","w",stdout);
	cin >> n >> q;
	for(int i=1;i<=n;++i)cin >> a[i];
	sort(a+1,a+n+1);
	for(int i=1;i<=n;++i)cnt[i]=cnt[i-1]+a[i]; 
	while(q--)
	{
		cin >> x >> y;
		int l=n-x+1,r=n-x+y;
		cout << cnt[r]-cnt[l-1] << "\n"; 
	} 
	return 0;
}

#include<bits/stdc++.h>

#define int long long

using namespace std;

int n,k,ans=0;
string s;
bool hw(string s)
{
	for(int i=0;i<s.size();++i)if(s[i]!=s[s.size()-i-1])return 0;
	return 1;
} 

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
//	freopen("c.in","r",stdin);
//	freopen("c.out","w",stdout);
	cin >> n >> k >> s;
	sort(s.begin(),s.end());
	do
	{
		bool f=1;
		for(int i=0;i<s.size()-k+1;++i) 
		{
			string tmp;
			for(int j=i;j<i+k;++j)tmp.push_back(s[j]);
			if(hw(tmp)==1)
			{
				f=0;
				break;
			} 
		}
		if(f==1)ans++; 
	}while(next_permutation(s.begin(),s.end()));
	cout << ans;
	return 0;
}

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int dp[50005];
int main(){
	int t;
	cin>>t;
	while(t--){
		memset(dp,0,sizeof dp);
		int n,P,Q;
		cin>>n>>P>>Q;
		int p[105],c[105];
		for(int i=1; i<=n; i++){
			cin>>p[i]>>c[i];
		}
		for(int i=1; i<=n; i++){
			for(int j=Q; j>=c[i];j--){
				dp[j]=max(dp[j],dp[j-c[i]]+p[i]);
			}
		}
		int flag=1;
		for(int i=1; i<=Q; i++){
			if(dp[i]>=P){
				cout<<i<<"\n";
				flag=0;
				break;
			}
		}
		if(flag==1) cout<<"-1\n";
	}
	return 0;
}