2024年睿抗机器人开发者大赛(RAICOM)国赛题解

目录

[RC-u1 大家一起查作弊 分数 15](#RC-u1 大家一起查作弊 分数 15)

[RC-u2 谁进线下了?II 分数 20](#RC-u2 谁进线下了?II 分数 20)

[RC-u3 势均力敌 分数 25](#RC-u3 势均力敌 分数 25)

[RC-u4 City 不 City 分数 30](#RC-u4 City 不 City 分数 30)

[RC-u5 贪心消消乐 分数 30](#RC-u5 贪心消消乐 分数 30)


RC-u1 大家一起查作弊 分数 15

简单模拟题,对于多行读入使用while(getline(cin,s))即可

cpp 复制代码
// 数学公式要变形
// 莫急莫急先读题
#include <bits/stdc++.h>
using namespace std;
#define lowbit(x) (x&(-x))
#define endl "\n"
#define ios ios::sync_with_stdio(0); cin.tie(0),cout.tie(0);
#define LF(x)   fixed<<setprecision(x)// c++ 保留小数
#define den(a) cout << #a << " = " << a << "\n";
#define deg(a) cout << #a << " = " << a << " ";
typedef long long LL;
typedef pair<int, int> PII;
const int N=1000010,M=1010,INF=0x3f3f3f3f,mod=1e9+7;
const double pai=acos(-1.0);// pai
map<int,int> mp;
int t,n,m;

//是不是关键字
bool check(char x){
	if('A'<=x and x<='Z') return true;
	if('a'<=x and x<='z') return true;
	if(isdigit(x)) return true;
	return false;
}
//可疑分数计算
int get(string s){
	int big = 0, small = 0, sz = 0;
	for(auto&x:s){
		if('A'<=x and x<='Z') big = 1;
		if('a'<=x and x<='z') small = 1;
		if(isdigit(x)) sz = 1;
	}
	if(big and small and sz) return 5;
	if(sz and (big or small)) return 3;
	if(big and small) return 1;
	return 0;
}
void solve(){
    
    int sum = 0,len = 0, cnt = 0;
    string s;
    while(getline(cin,s)){
    	string now;
    	for(auto&v:s)
    		if(check(v)) now += v;
    		else{
    			if(!now.empty()){
    				sum += get(now);
    				len += now.size();
    				cnt++;
    			}
    			now.clear();
    		}
        // 可能最后还有东西
    	if(!now.empty()){
    		sum += get(now);
    		len += now.size();
    		cnt++;
    	}
    }
    cout << sum << endl;
    cout << len << ' ' << cnt << endl;
    return ;
}
signed main ()
{
    ios// 不能有printf puts scanf
    int t=1;
    while(t--){
    	 solve();
    }
}

RC-u2 谁进线下了?II 分数 20

简单模拟,按照题目意思模拟即可

cpp 复制代码
// 数学公式要变形
// 莫急莫急先读题
#include <bits/stdc++.h>
using namespace std;
#define lowbit(x) (x&(-x))
#define endl "\n"
#define ios ios::sync_with_stdio(0); cin.tie(0),cout.tie(0);
#define LF(x)   fixed<<setprecision(x)// c++ 保留小数
#define den(a) cout << #a << " = " << a << "\n";
#define deg(a) cout << #a << " = " << a << " ";
typedef long long LL;
typedef pair<int, int> PII;
const int N=1000010,M=1010,INF=0x3f3f3f3f,mod=1e9+7;
const double pai=acos(-1.0);// pai
map<int,int> mp;
int t,n,m;
int d[30] = {0,25,21,18,16};
bool st[N];
int w[N];

struct code{
	int id,x;
	bool operator<(const code&t)const{
		if(x==t.x) return id<t.id;
		return x>t.x;
	}
}e[N];

void solve(){
    
	for(int i=5;i<=20;i++) d[i] = 20 - i;
	
	cin>>n;
	while(n--){
		m = 20;
		while(m--){
			int x,r; cin>>x>>r;
			w[x] += d[r];
			st[x] = true;
		}
	}    
	n = 30;
	for(int i=1;i<=n;i++) e[i]={i,w[i]};
	sort(e+1,e+1+n);
	
	for(int i=1;i<=n;i++){
		auto [id,x] = e[i];
		if(!st[id]) continue;
		cout << id << ' ' << x << endl;
	}
	cout << endl;
    return ;
}
signed main ()
{
    ios// 不能有printf puts scanf
    int t=1;
    while(t--){
    	 solve();
    }
}

RC-u3 势均力敌 分数 25

按照题目直接暴力枚举所有情况使用全排列 + 二进制枚举

时间复杂度大致如下 同时不会跑满所以可以通过

cpp 复制代码
// 数学公式要变形
// 莫急莫急先读题
#include <bits/stdc++.h>
using namespace std;
#define lowbit(x) (x&(-x))
#define endl "\n"
#define ios ios::sync_with_stdio(0); cin.tie(0),cout.tie(0);
#define LF(x)   fixed<<setprecision(x)// c++ 保留小数
#define den(a) cout << #a << " = " << a << "\n";
#define deg(a) cout << #a << " = " << a << " ";
typedef long long LL;
typedef pair<int, int> PII;
const int N=1000010,M=1010,INF=0x3f3f3f3f,mod=1e9+7;
const double pai=acos(-1.0);// pai
map<int,int> mp;
int t,n,m;
int a[N],p[N];

void solve(){
    
    cin>>n;
    for(int i=1;i<=n;i++){
    	cin>>a[i];
    	p[i] = i;
    }
    vector<int> v;
    int sum = 0;
    do{
    	int ans = 0;
    	for(int i=1;i<=n;i++) ans = ans * 10 + a[p[i]];
    	v.push_back(ans);
    	sum += ans;
    }while(next_permutation(p+1,p+1+n));
    
    m = v.size();
   
    

    for(int i=0;i<(1<<m);i++){
    	if(__builtin_popcount(i)!=m/2) continue;
    	int now = 0;
    	vector<int> ans;
    	for(int j=0;j<m;j++){
    		if(i>>j&1){
				ans.push_back(v[j]);
				now += v[j];	
    		}
    	}
    	if(now==sum/2){
    		for(auto&v:ans) cout << v << endl;
    		cout << endl;
    		return ;
    	}
    }
    return ;
}
signed main ()
{
    ios// 不能有printf puts scanf
    int t=1;
    while(t--){
    	 solve();
    }
}

RC-u4 City 不 City 分数 30

典型的分层图,一个城市有多个状态,跑一遍djikstra即可,注意本题是计算途经城市的hot值,所以初始状态是 d[s][0] = 0,在可以抵达t的时候来判断即可

cpp 复制代码
// 数学公式要变形
// 莫急莫急先读题
#include <bits/stdc++.h>
using namespace std;
#define lowbit(x) (x&(-x))
#define endl "\n"
#define ios ios::sync_with_stdio(0); cin.tie(0),cout.tie(0);
#define LF(x)   fixed<<setprecision(x)// c++ 保留小数
#define den(a) cout << #a << " = " << a << "\n";
#define deg(a) cout << #a << " = " << a << " ";
typedef long long LL;
typedef pair<int, int> PII;
typedef array<int,3> ar3;
const int N=1000010,M=1010,INF=0x3f3f3f3f,mod=1e9+7;
const double pai=acos(-1.0);// pai
map<int,int> mp;
int n,m,s,t;
int h[M];
vector<PII> g[M];
int d[M][110];

void solve(){
    
    cin>>n>>m>>s>>t;
    
    for(int i=1;i<=n;i++) cin>>h[i];
    
    while(m--){
    	int a,b,c; cin>>a>>b>>c;
    	g[a].push_back({b,c});
    	g[b].push_back({a,c});
    }
    
    int ans = 2e9,pos = -1;
    auto dijkstra = [&](){
    	memset(d,0x3f,sizeof d);
    	priority_queue<ar3,vector<ar3>,greater<ar3>> q;
    	d[s][0] = 0, q.push({0,s,0});
    	while(!q.empty()){
    		auto [cost,u,hot] = q.top(); q.pop();
    		for(auto&[v,w]:g[u]){
    			int ne = max(hot,h[v]);
    			if(v==t){
    				if(cost+w<ans){
    					ans = cost + w;
    					pos = hot;
    				}
    				else if(cost+w==ans and hot<pos){
    					pos = hot;
    				}
    			}
    			if(d[v][ne]>cost+w){
    				d[v][ne] = cost + w;
    				q.push({cost+w,v,ne});
    			}
    		}
    	}
    };
    dijkstra();
    if(pos==-1) cout << "Impossible" << endl;
    else cout << ans << ' ' << pos << endl;
    
    return ;
}
signed main ()
{
    ios// 不能有printf puts scanf
    int t=1;
    while(t--){
    	 solve();
    }
}

RC-u5 贪心消消乐 分数 30

贪心模拟,每次都暴力的找到可以选取的最大矩阵即可,然后模拟下降,没有找到正解,这里贴一下别人的x*(n^4)比较暴力的做法,赛时通过了

cpp 复制代码
#include <bits/stdc++.h>

using namespace std;
using i64 = long long;

constexpr int inf = 5E6;

void solve() {
	int n;
	cin >> n;
	
	vector<vector<int>> g(n, vector<int>(n, 0));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			cin >> g[i][j];
			if (g[i][j] == 0) {
				g[i][j] = -inf;
			}
		}
	}
	
	vector<vector<i64>> sum(n + 1, vector<i64>(n + 1, 0));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			sum[i + 1][j + 1] = sum[i + 1][j] + sum[i][j + 1] - sum[i][j] + g[i][j];
		}
	}
	
	i64 tot = 0;
	while (1) {
		i64 hi = 0;
		int a, b, c, d;
		for (int x1 = 0; x1 < n; x1++) {
			for (int y1 = 0; y1 < n; y1++) {
				for (int x2 = x1; x2 < n; x2++) {
					for (int y2 = y1; y2 < n; y2++) {
						if (g[y2][x2] == -inf) {
							break;
						}
						i64 cur = sum[y2 + 1][x2 + 1] - sum[y2 + 1][x1] - sum[y1][x2 + 1] + sum[y1][x1];
						if (cur > hi) {
							hi = cur;
							a = x1;
							b = y1;
							c = x2;
							d = y2;
						}
						if (cur < 0) {
							break;
						}
					}
				}
			}
		}
		if (hi <= 0) {
			break;
		}
		
		tot += hi;
		cout << "(" << a + 1 << ", " << b + 1 << ") (" << c + 1 << ", " << d + 1 << ") " << hi << "\n";
		
		int o = d - b + 1;
		for (int x = a; x <= c; x++) {
			for (int y = d; y >= 0; y--) {
				if (y >= o) {
					g[y][x] = g[y - o][x];
				} else {
					g[y][x] = -inf;
				}
			}
		}
		for (int i = 0; i <= n; i++) {
			fill(sum[i].begin(), sum[i].end(), 0);
		}
		for (int i = 0; i < n; i++) {
			for (int j = 0; j < n; j++) {
				sum[i + 1][j + 1] = sum[i + 1][j] + sum[i][j + 1] - sum[i][j] + g[i][j];
			}
		}
	}
	cout << tot << "\n";
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int T = 1;
//	cin >> T;

	while (T--) {
		solve();
	}

	return 0;
}
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