A
\(\quad\)简单题，看清题意乱搞就可以了。

code

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<string>
#include<algorithm>
#include<cmath>
#include<ctime>
#include<climits>
#include<sstream>
#include<fstream>
using namespace std;
#define int long long

signed main()
{
    int n;
    cin >> n;
    int a = 3 , b = 5;
    int ca = 1 , cb = 1;
    while(b <= n)
    {
        cb++;
        b *= 5;
    }
    while(a <= n)
    {
        while(a + b > n && cb > 1)
        {
            cb--;
            b /= 5;
        }
        if(a + b == n)
        {
            cout << ca << " " << cb;
            return 0;
        }
        a *= 3;
        ca++;
        b *= 5;
        cb++;
    }
    cout << -1;
    return 0;
}

B
\(\quad\)考虑到一个连通块内的节点数值可以相互转移，所以用并查集弄弄就好了。

code

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<string>
#include<algorithm>
#include<cmath>
#include<ctime>
#include<climits>
#include<sstream>
#include<fstream>
using namespace std;
#define int long long

const int N = 2e5 + 10;

int fa[N];

inline int find(int x)
{
    if(x == fa[x])
    {
        return fa[x];
    }
    else
    {
        return fa[x] = find(fa[x]);
    }
}

inline void modify(int x , int y)
{
    int p = find(x) , q = find(y);
    fa[p] = q;
}

int a[N] , b[N];
int sa[N] , sb[N];

signed main()
{
    ios::sync_with_stdio(false);
    int n , m;
    cin >> n >> m;
    for(register int i = 1 ; i <= n ; i++)
    {
        cin >> a[i];
    }
    for(register int i = 1 ; i <= n ; i++)
    {
        cin >> b[i];
    }
    for(register int i = 1 ; i <= n ; i++)
    {
        fa[i] = i;
    }
    for(register int i = 1 ; i <= m ; i++)
    {
        int u , v;
        cin >> u >> v;
        modify(u , v);
    }
    for(register int i = 1 ; i <= n ; i++)
    {
        sa[find(i)] += a[i];
        sb[find(i)] += b[i];
    }
    for(register int i = 1 ; i <= n ; i++)
    {
        if(sa[i] != sb[i])
        {
            cout << "No";
            return 0;
        }
    }
    cout << "Yes";
    return 0;
}

C题题目太常生肉看不懂就走去搞其它的了。

ARC106