2015年海淀區資訊學競賽小學組詳細答案
摘要：
1 成績統計
#include <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
int cnt1 = 0, cnt2 = 0, cnt3 = 0, cnt4...
1 成績統計
#include <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
int cnt1 = 0, cnt2 = 0, cnt3 = 0, cnt4 = 0;
int a[n];
for(int i = 0; i < n; i++)
{
cin >> a[i];
if(a[i] >= 90 && a[i] <= 100)
{
cnt1++;
}
else if(a[i] >= 80 && a[i] <= 89)
{
cnt2++;
}
else if(a[i] >= 60 && a[i] <= 79)
{
cnt3++;
}
else
{
cnt4++;
}
}
cout << "You " << cnt1 << endl;
cout << "Liang " << cnt2 << endl;
cout << "Zhong " << cnt3 << endl;
cout << "Cha " << cnt4 << endl;
return 0;
}
2 列印圖形
#include <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
for(int i = 1; i <= 2 * n - 1; i++)
{
int j = (i > n) ? 2 * n - i : i;
for(int k = 1; k < j; k++)
{
cout << ' ';
}
char c;
for(c = 'A' + j - 1; c < 'A' + n; c++)
{
cout << c;
}
for(c = c - 2; c >= 'A' + j - 1; c--)
{
cout << c;
}
cout << endl;
}
return 0;
}
3 數值計算
#include<bits/stdc++.h>
using namespace std;
bool isprime(int a)
{
if(a == 1)
{
return false;
}
for(int i = 2; i <= sqrt(a); i++)
{
if(a % i == 0)
{
return false;
}
}
return true;
}
int main()
{
int l, r, sum = 0;
cin >> l >> r;
for(int i = l; i <= r; i++)
{
if(isprime(i) &&
sqrt(i / 100) - (int)sqrt(i / 100) == 0 &&
sqrt(i % 100) - (int)sqrt(i % 100) == 0)
{
cout << i << endl;
sum++;
}
}
cout << sum << endl;
return 0;
}