2020第一届大湾区信息学竞赛U12组参考答案

第一届大湾区信息学竞赛U12组参考答案"/>

2020第一届大湾区信息学竞赛U12组参考答案

参考答案

一、选择

1 B
2 C
3 D
4 C
5 A
6 A
7 C
8 C
9 B
10 D

二、填空

1. 24
2. 49/825
3. 32
4. 3
5. 3

三、阅读程序并填空

1

#include <iostream>
using namespace std;int n, cnt;int main()
{cin >> n;for(int i = 1; i <= n; i++){int flag = 1;if(i % 3 == 0){continue;}int x = i;while(x){if(x % 10 == 3){flag = 0;break;}x /= 10;}if(flag){cnt++;}}cout << cnt << endl;return 0;
}

2

#include <iostream>
using namespace std;int main()
{char num[50];int n;int cnt = 0;cin >> n;while(n > 0){num[cnt] = n % 10 + '0';n = n / 10;cnt = cnt + 1;}num[cnt] = '\0';cout << num;return 0;
}

四、编程

1

#include <iostream>
using namespace std;const int maxN = 1005;
int a[maxN];int main()
{int n;cin >> n;for(int i = 1; i <= n; i++){cin >> a[i];}//分糖果的过程for(int i = 1; i <= n; i++){int L = (1 == i) ? n : i - 1;a[L] += a[i] / 3;int R = (n == i) ? 1 : i + 1;a[R] += a[i] / 3;a[i] /= 3;}for(int i = 1; i <= n; i++){cout << a[i] << ' ';}return 0;
}

2

#include <iostream>
using namespace std;int main()
{string s[10] = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};int n;cin >> n;while(n--){int x;cin >> x;cout << s[x] << endl;}return 0;
}

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