2070:

#include <cstdio>

using namespace std;
typedef long long LL;

LL a[55];

int main()
{
    a[0] = 0;
    a[1] = 1;
    a[2] = 1;
    for(int i=3; i<55; i++)
    {
        a[i] = a[i-1] + a[i-2];
    }
    int n;
    while(scanf("%d", &n), n != -1)
    {
        printf("%lld\n", a[n]);
    }


    return 0;
}

2071:

#include <bits/stdc++.h>

using namespace std;
const int N = 110;

double a[N];

int main()
{
    int t;
    scanf("%d", &t);
    while(t--)
    {
        int n;
        scanf("%d", &n);
        for(int i=0; i<n; i++)
        {
            scanf("%lf", &a[i]);
        }
        double maxnum = a[0];
        for(int i=1; i<n; i++)
        {
            if(a[i] > maxnum)
                maxnum = a[i];
        }
        printf("%.2lf\n", maxnum);
    }


    return 0;
}

2072:

#include <bits/stdc++.h>

using namespace std;

string s, s1;
map<string, int> mp;

int main()
{
    ios::sync_with_stdio(0);
    while(getline(cin , s))
    {
        if(s == "#")
            break;
        s1.clear();
        mp.clear();
        int slen = s.size();
        for(int i=0; i < slen; i++)
        {
            if(s[i] != ' ')
            {
                s1.push_back(s[i]);
            }
            else if(s1.size() != 0)
            {
                // cout << "s1 = " << s1 << endl;
                mp[s1] ++;
                s1.clear();
            }
        }
        if(s1.size() != 0)
            mp[s1] ++;

        cout << mp.size() << endl;
    }



    return 0;
}

2073:

#include <bits/stdc++.h>

using namespace std;

double cal(double x, double y)
{
    double i = 0, j = 1;
    double res = 0;
    int cnt = 0;
    while(i <= y-1 && j <= y)
    {
        if(cnt % 2 == 0)
        {
            res += sqrt(i*i + j*j);
            i++;
            cnt ++;
        }
        else
        {
            res += sqrt(i*i + j*j);
            j++;
            cnt ++;
        }
    }
    return res;
}
double ffabs(double num)
{
    if(num < 0)
        return -num;
    return num;
}

int main()
{
    int n;
    scanf("%d", &n);
    while(n--)
    {
        double x1, y1, x2, y2;
        scanf("%lf %lf %lf %lf", &x1, &y1, &x2, &y2);
 
        double dis1 = 0;
        if(x1 != 0)
        {
            dis1 += x1 * sqrt(2.0);
            y1 += x1;
            x1 = 0;
        }

        double dis2 = 0;
        if(x2 != 0)
        {
            dis2 += x2 * sqrt(2.0);
            y2 += x2;
            x2 = 0;
        }
        dis1 += cal(x1, y1);
        dis2 += cal(x2, y2);
        printf("%.3lf\n", ffabs(dis2 - dis1));

    }



    return 0;
}

2074:

// 这题不会写,以后再补

2075:

#include <bits/stdc++.h>

using namespace std;
typedef long long LL;


int main()
{
    int t;
    scanf("%d", &t);
    while(t--)
    {
        LL a, b;
        scanf("%lld %lld", &a, &b);
        if(a%b == 0)
            printf("YES\n");
        else 
            printf("NO\n");
    }



    return 0;
}

2076:

#include <bits/stdc++.h>

using namespace std;

int main()
{   
    int t;
    scanf("%d", &t);
    while(t--)
    {
        double h, m, s;
        scanf("%lf %lf %lf", &h, &m, &s);
        if(h >= 12.0)
            h -= 12.0;
        double mc = m*6 + s*0.1;
        double hc = h*5*6 + (m + s/60.0) / 60.0 * 30.0;
        
        double ans = 0;
        if(hc > mc)
            ans = hc - mc;
        else 
            ans = mc - hc;
        if(ans > 180.0)
            printf("%.0lf\n", floor(360.0 - ans));
        else 
            printf("%.0lf\n", floor(ans));
        
    }



    return 0;
}

2077:

// 这题不会,以后再补

2078:

#include <bits/stdc++.h>

using namespace std;

int main()
{
    int t;
    scanf("%d", &t);
    while(t--)
    {
        int n, m;
        scanf("%d %d", &n, &m);
        int amin = 1000000, a;
        for(int i=0; i<n; i++)
        {
            scanf("%d", &a);
            amin = min(amin, a);
        }
        printf("%d\n", (100-amin) * (100-amin));
    }


    return 0;
}

2079:

#include <bits/stdc++.h>

using namespace std;

int D[10];
int n, k;
int sum = 0;

// 第一个参数是已选学分总数,第二个参数是第几个学分的课
void dfs(int s, int t)
{
    int i, j;
    if(s > n)   return;
    if(s == n)  sum ++;
    for(int i=t+1; i<10; i++)   // 遍历学分数
    {
        for(int j=1; j <= D[i]; j++)    // 遍历每种学分的课程数
        {
            dfs(s + i*j, i);
        }
    }
}

int main()
{
    int t;
    scanf("%d", &t);
    while(t--)
    {
        
        scanf("%d %d", &n, &k);
        int a, b;
        for(int i=0; i<k; i++)
        {
            scanf("%d %d", &a, &b);
            D[a] = b;
        }
        sum = 0;
        dfs(0, 0);
        printf("%d\n", sum);


    }



    return 0;
}