"字节跳动杯"2018中国大学生程序设计竞赛-女生专场

口算训练

#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <string>
#include <map>
#include <cmath>
#include <vector>

#define Faster ios::sync_with_stdio(false),cin.tie(0)
#define Read freopen("in.txt","r",stdin),freopen("out.txt","w",stdout)
#define Close fclose(stdin),fclose(stdout)
const int maxn = 1e5 + 5;
using namespace std;
const int MOD = 1e9+7;
typedef long long ll;

vector<int> g[maxn];
//下标肯定是从小到大按顺序的

void res(int id, int x){
    for(int i = 2;i*i <= x;i++){
        while(x%i == 0){
            g[i].push_back(id);
            x /= i;
        }
    }
    if(x > 1)
        g[x].push_back(id);
}

int query(int l,int r, int x){
    return upper_bound(g[x].begin(), g[x].end(), r) - lower_bound(g[x].begin(),g[x].end(), l);
}

void init(){
    for(int i = 0;i < maxn;i++)
        g[i].clear();
}

int main(){
    // Faster;
    int t;
    // cin >> t;
    scanf("%d", &t);
    while(t--){
        init();
        int n, q;
        scanf("%d%d", &n, &q);
        for(int i = 1;i <= n;i++){
            int x;
            // cin >> x;
            scanf("%d", &x);
            res(i, x);
        }
        while(q--){
            int l, r, d, num;
            // cin >> l >> r >> d;
            scanf("%d%d%d", &l, &r, &d);
            bool ok = true;
            for(int i = 2;i*i <= d;i++){
                int cnt = 0;
                while(d%i == 0){
                    cnt++;
                    d /= i;
                }
                //因子为i 的数目 大于（l,r）中i 的个数
                num = query(l, r, i);
                if(cnt > num){
                    ok = false;
                    break;
                }
            }
            if(ok && d > 1){
                num = query(l, r, d);
                if(num == 0)
                    ok = false;
            }
            if(ok)
                // cout << "Yes" << endl;
                printf("Yes
");
            else
                // cout << "No" << endl;
                printf("No
");
        }
    }
    return 0;
}

缺失的数据范围

#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <string>
#include <map>
#include <cmath>
#include <vector>

#define Faster ios::sync_with_stdio(false),cin.tie(0)
#define Read freopen("in.txt","r",stdin),freopen("out.txt","w",stdout)
#define Close fclose(stdin),fclose(stdout)
const int maxn = 1e4 + 5;
using namespace std;
const int MOD = 1e9+7;
typedef unsigned long long ll;

int a, b;
ll k;

bool check(ll x){
    long double ans = 1;
    for(int i = 0;i < a;i++){
        ans *= x;
        if(ans > k)
            return false;
    }
    ll bb = ceil(log2(x));
    for(int i = 0;i < b;i++){
        ans *= bb;
        if(ans > k)
            return false;
    }
    return true;
}

int main(){
    Faster;
    int n;
    cin >> n;
    while(n--){
        cin >> a >> b >> k;
        ll l = 1;
        ll r = k;
        while(l <= r){
            ll mid = (l+r)/2;
            if(check(mid)){
                l = mid+1;
            }
            else{
                r = mid-1;
            }
        }
        cout << r << endl;
    }
    return 0;
}

赛题分析

#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <string>
#include <map>
#include <cmath>
#include <vector>

#define Faster ios::sync_with_stdio(false),cin.tie(0)
#define Read freopen("in.txt","r",stdin),freopen("out.txt","w",stdout)
#define Close fclose(stdin),fclose(stdout)
const int maxn = 1e4 + 5;
using namespace std;
const int MOD = 1e9+7;
typedef long long ll;

#define INF 0xfffffff

int main(){
    Faster;
    int t;
    cin >> t;
    int cnt = 1000;
    while(t--){
        int n, m;
        cin >> n >> m;
        int Min1 = INF;
        int Min2 = INF;
        for(int i = 0;i < n;i++){
            int x;
            cin >> x;
            if(x < Min1){
                Min1 = x;
            }
        }
        for(int i = 0;i < m;i++){
            int x;
            cin >> x;
            if(x < Min2){
                Min2 = x;
            }
        }
        cout << "Problem " << ++cnt << ":" << endl;
        cout << "Shortest judge solution: " << Min1 << " bytes." << endl;
        if(Min2 == INF)
            cout << "Shortest team solution: N/A bytes." << endl;
        else
            cout << "Shortest team solution: " << Min2 << " bytes." << endl;
    }
    return 0;
}

SA-IS后缀数组

#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <string>
#include <map>
#include <cmath>
#include <vector>

#define Faster ios::sync_with_stdio(false),cin.tie(0)
#define Read freopen("in.txt","r",stdin),freopen("out.txt","w",stdout)
#define Close fclose(stdin),fclose(stdout)
const int maxn = 1e4 + 5;
using namespace std;
const int MOD = 1e9+7;
typedef long long ll;

int main(){
    Faster;
    int t;
    cin >> t;
    while(t--){
        int n;
        cin >> n;
        string s;
        cin >> s;
        int cnt = 0;
        for(int i = 0;i < n-1;i++){
            if(s[i] == s[i+1]){
                cnt++;
            }
            else if(s[i] < s[i+1]){
                cnt++;
                while(cnt){
                    cnt--;
                    cout << "<";
                }
            }
            else if(s[i] > s[i+1]){
                cnt++;
                while(cnt){
                    cnt--;
                    cout << ">";
                }
            }
        }
        while(cnt--){
            cout << ">";
        }
        cout << endl;
    }
    return 0;
}