ccfcsp-202403（1、2、3、4）

202403-1 词频统计

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, m;
    cin >> n >> m;
    vector<int> vec(m + 1, 0);
    unordered_map<int,int> mmap;
    for(int i = 0; i < n; i++){
        int l;
        cin >> l;
        unordered_set<int> mset;
        while(l--){
            int k;
            cin >> k;
            mmap[k]++;
            mset.insert(k);
        }
        for(auto it : mset){
            vec[it]++;
        }
    }
    for(int i = 0; i < m; i++) {
        cout << vec[i + 1] << " " << mmap[i + 1] << endl;
    }
    return 0;
}

202403-2 相似度计算

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, m;
    cin >> n >> m;
    unordered_set<string> mset1;
    unordered_set<string> mset2;
    string s;
    for(int i = 0; i < n; i++){
        cin >> s;
        string str = "";
        for(char c : s){
            if(isupper(c)){
                c += 32;
            }
            str += c;
        }
        mset1.insert(str);
    }
    for(int i = 0; i < m; i++){
        cin >> s;
        string str = "";
        for(char c : s){
            if(isupper(c)){
                c += 32;
            }
            str += c;
        }
        mset2.insert(str);
    }
    unordered_set<string> intersection;
    for(auto it : mset1){
        if(mset2.find(it) != mset2.end()){
            intersection.insert(it);
        }
    }
    cout << intersection.size() << endl << mset1.size() + mset2.size() - intersection.size();
    return 0;
}

202403-3 化学方程式配平

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

int main(){
    int n, m;
    cin >> n;
    while(n--){
        cin >> m;
        int l = 0;
        vector<vector<double>> matrix(50,vector<double>(50, 0));
        vector<string> vec(m);
        map<string,int> rowmap;//记录物质中的元素的位置（行数）
        int row = 0;
        unordered_set<string> set;//记录元素个数
        for(int i = 0; i < m; i++){//一个物质
            unordered_map<string, int> elem;
            cin >> vec[i];
            for(int j = 0; j < vec[i].size();){
                string element = "";
                string num = "";
                while(!isnumber(vec[i][j])){
                    element += vec[i][j];
                    j++;
                }
                while(isnumber(vec[i][j])){
                    num += vec[i][j];
                    j++;
                }
                elem[element] = stoi(num);
                if(rowmap.find(element) == rowmap.end()){
                    rowmap[element] = l++;
                }
                matrix[rowmap[element]][i] = stoi(num);
                set.insert(element);
            }
            row = row > set.size() ? row : set.size();
        }

        //处理矩阵
        int flag = 0, j = -1;
        //考察矩阵的第一列上的元素
        while(flag == 0){
            j++;
            for(int i = 0; i < row; i++){
                if(matrix[i][j] != 0){
                    flag = 1;
                    break;
                }
            }
        }
        //若不全为零
        int a = 0;
        for(; j < m; j++){
            if(matrix[a][j] == 0){ //如果其为 0，则将该行与后面的某一个第一列非 0 的行交换，使第一行第一列的元素非0
                int b = a + 1;
                while(matrix[b][j] == 0 && b < row)
                    b++;
                if(b >= row)
                    break;
                for(int col = j; col < m; col++){
                    swap(matrix[a][col], matrix[b][col]);
                }
            }
            //令后续所有行减去第一行的适当倍数，使得后续所有行的第一列元素为 0
            for(int t = j + 1; t < row; t++){
                double k = matrix[t][j] / matrix[a][j];
                for(int col = j; col < m; col++){
                    matrix[t][col] -= matrix[a][col] * k;
                }
            }
            a++;
        }
        int r = 0;
        for(int i = 0; i < row; i++){
            int flag = 0;
            for(int j = 0; j < m; j++){
                if(matrix[i][j] != 0){
                    flag = 1;
                    break;
                }
            }
            if(flag)
                r++;
        }
        if(r < m){
            cout << "Y" << endl;
        }else{
            cout << "N" << endl;
        }

    }
    return 0;
}

202403-4 十滴水

#include <bits/stdc++.h>
using namespace std;
vector<int> vec(3e5, 0);
void dfs(int x,int c){
    if(x <= 0 || x > c)
        return;
    if(vec[x] >= 5){
        vec[x] = 0;
        int l = x - 1, r = x + 1;
        while(vec[l] == 0 && l > 0)
            l--;
        while(vec[r] == 0 && r <= c)
            r++;
        if(l > 0){
            vec[l]++;
        }
        if(r <= c){
            vec[r]++;
        }
        dfs(l,c);
        dfs(r,c);

    }
}
int main(){
    int c,m,n;
    cin >> c >> m >> n;
    for(int i = 0; i < m; i++){
        int x, y;
        cin >> x >> y;
        vec[x] = y;
    }
    for(int i = 0; i < n; i++){
        int x;
        cin >> x;
        vec[x]++;
        dfs(x,c);
        int res = 0;
        for(int j = 1; j <= c; j++){
            if(vec[j] != 0)
                res++;
        }
        cout << res << endl;
    }
    return 0;
}

满分解（使用小根堆）

int main() {
    int n,m,k;
    map<int, int> mp;
    cin >> n >> m >> k;
    for (int i = 1; i <= m; i++) {
        int x, w;
        cin >> x >> w;
        mp[x] = w;
    }
    priority_queue<int, vector<int>, greater<int>> pq;
    for (int i = 1; i <= k; i++) {
        int p; 
        cin >> p;
        mp[p]++;
        if (mp[p] == 5) pq.push(p);
        while (!pq.empty()) {
            int u = pq.top(); pq.pop();
            mp.erase(u);
            auto it = mp.lower_bound(u);
            if (it != mp.begin()) {
                (--it)->second++;
                if (it->second == 5) 
                	pq.push(it->first);
            }
            it = mp.upper_bound(u);
            if (it != mp.end()) {
                it->second++;
                if (it->second == 5) 
               		pq.push(it->first);
            }
        }
        cout << mp.size() << endl;
    }
    return 0;
}

202403-5 文件夹合并