2018国庆节练习小结

HDU 6213 Chinese Zodiac

保证女比男大的情况下,两人年龄差距最小时多少

 1 #include <cstdio>
 2 #include <cstring>
 3 
 4 char ls[12][20] = {"rat", "ox", "tiger", "rabbit", "dragon", "snake", "horse", "sheep", 
 5 "monkey", "rooster", "dog", "pig"};
 6 int main()
 7 {
 8     int T;
 9     char a[20], b[20];
10     scanf("%d", &T);
11     while(T--) {
12         scanf(" %s%s", a, b);
13         int c, d;
14         for(int i = 0; i < 12; i++) {
15             if(strcmp(ls[i], a) == 0) {
16                 c = i;
17             }
18             if(strcmp(ls[i], b) == 0) {
19                 d = i;
20             }
21         }
22         
23         if(c == d)
24             printf("12\n");
25         else
26             printf("%d\n", (d + 12 - c) % 12);
27     }
28     return 0;
29 }

HDU 6216 A Cubic number and A Cubic Number

给出一个素数,为该素数是否是两个立方数之差,写出代数式,进行优化。

 1 #include <cstdio>
 2 #include <cmath>
 3 #include <set>
 4 #include <cstdlib>
 5 #include <algorithm>
 6 using namespace std;
 7 
 8 const int maxn = 1000010;
 9 long long ls[maxn];
10 int main()
11 {
12     long long i;
13     for(i =  0; i < 1000000; i++) {
14         ls[i] = 3 * i * i + 3 * i + 1;
15     }
16     
17     int T;
18     long long x, y;
19     while(scanf("%d", &T) != EOF) {
20         while(T--)
21         {
22             scanf("%lld", &x);
23             
24             int i, j, k, l;
25             for(i = l = 0, j = 1000000; j - i > 1; )
26             {
27                 k = (i+j) / 2;
28                 if(x > ls[k])
29                     i = k;
30                 else if(x < ls[k])
31                     j = k;
32                 else 
33                 {
34                     l = 1;
35                     break;
36                 }
37                 
38             }
39             
40             if(!l)
41                 puts("NO");
42             else
43                 puts("YES");
44         }
45     }
46     return 0;
47 }

HDU 6225 Little Boxes

计算四个的和,完全是卡边界的问题,具体看代码

#include<stdio.h>
#include <iostream>
using namespace std;

int main()
{
    unsigned long long n,a,b,c,d,sum;
    scanf("%lld",&n);
    while(n--)
    {
        
        scanf("%lld%lld%lld%lld",&a,&b,&c,&d);
        if(a==4611686018427387904&&b==4611686018427387904
        &&c==4611686018427387904&&d==4611686018427387904)
            printf("18446744073709551616\n");
        else
            cout<<(unsigned long long)(a+b+c+d)<<endl;
    }
    return 0;
}

HDU 6227 Rabbits

最外边的一只兔子往中间的空位置上跳一次算一个计数,问最多能够跳几次。

从第二个开始计算间距差,累加即可。另外还需要反着跑一遍,因为最外面的兔子有开头和结尾两只。

 1 #include<stdio.h>
 2 
 3 int main()
 4 {
 5     int t,n,i,sum1,sum2;
 6     int a[520];
 7     scanf("%d",&t);
 8     while(t--)
 9     {
10         sum1=0;
11         sum2=0;
12         scanf("%d",&n);
13         for(i=1;i<=n;i++)
14             scanf("%d",&a[i]);
15         for(i=n;i>2;i--)
16             sum1+=(a[i]-a[i-1]-1);
17         for(i=1;i<n-1;i++)
18             sum2+=(a[i+1]-a[i]-1);
19         if(sum1>sum2)
20             printf("%d\n",sum1);
21         else
22             printf("%d\n",sum2);    
23     }
24     return 0;
25 }

HDU 6197 array array array

计算最长非乱序子序列,计算一边最长上不下降子序列和最长不上升子序列即可。

 1 #include <cstdio>
 2 #include <algorithm>
 3 using namespace std;
 4 
 5 const int maxn = 100010;
 6 const int inf = 99999999;
 7 int A[maxn], B[maxn], g[maxn], d[maxn];
 8 int n, t;
 9 
10 int main()
11 {
12     int T;
13     scanf("%d", &T);
14     while(T--) {
15         scanf("%d%d", &n, &t);
16         for(int i = 0; i < n; i++) {
17             scanf("%d", &A[i]);
18         }
19         
20         for(int i = 1; i <= n; i++) {
21             g[i] = inf;
22         }
23         for(int i = 0; i < n; i++) {
24             int k = upper_bound(g + 1, g + n + 1, A[i]) - g;
25             d[i] = k;
26             g[k] = A[i];
27         }
28         int s1 = 0;
29         for(int i = 0; i < n; i++)
30             if(s1 < d[i])
31                 s1 = d[i];
32         
33         int j = 0;
34         for(int i = n - 1; i >= 0; i--) {
35             B[j++] = A[i];
36         }
37         for(int i = 1; i <= n; i++) {
38             g[i] = inf;
39         }
40         for(int i = 0; i < n; i++) {
41             int k = upper_bound(g + 1, g + n + 1, B[i]) - g;
42             d[i] = k;
43             g[k] = B[i];
44         }
45         int s2 = 0;
46         for(int i = 0; i < n; i++)
47             if(s2 < d[i])
48                 s2 = d[i];
49         
50         //printf("%d %d\n",s1,s2);
51         int ans = max(s1, s2);//最长上升或者下降子序列,意味者修改更少 
52         if(n - t <= ans)
53             printf("A is a magic array.\n");
54         else
55             printf("A is not a magic array.\n");
56     }
57     return 0;
58 }

ZOJ 4024 Peak

判断一个数组是否是凸形。

 1 #include <cstdio>
 2 const int maxn = 100000 + 10;
 3 int a[maxn];
 4 
 5 int main() 
 6 {
 7     int T;
 8     scanf("%d", &T);
 9     while(T--) {
10         int n;
11         scanf("%d", &n);
12         for(int i = 0; i < n; i++) {
13             scanf("%d", &a[i]);
14         }
15         int q = 0, h = 0, i;
16         for(i = 0; i < n - 1; i++) {
17             if(a[i] < a[i + 1])
18                 q++;
19             else
20                 break;
21         }
22         for(; i < n - 1; i++) {
23             if(a[i] > a[i + 1])
24                 h++;
25             else
26                 break;
27         }
28         //printf("%d %d\n", q, h);
29         
30         if(q && h && q + h == n - 1)
31             puts("Yes");
32         else
33             puts("No");
34     }
35     return 0;
36 }

ZOJ 4025 King of Karaoke

给出两个数组,问第一个数组通过加上一个数和另一个数的最大耦合度是多少

对应做差,看哪个差出现的次数最多。

 1 #include <cstdio>
 2 #include <map>
 3 
 4 using namespace std;
 5 const int maxn = 100000 + 10;
 6 int D[maxn], S[maxn];
 7 int n;
 8 
 9 map<int, int> mp;
10 int main()
11 {
12     int T;
13     scanf("%d", &T);
14     while(T--) {
15         scanf("%d", &n);
16         for(int i = 0; i < n; i++) {
17             scanf("%d", &D[i]);
18         }
19         for(int i = 0; i < n; i++) {
20             scanf("%d", &S[i]);
21         }
22         
23         mp.clear();
24         for(int i = 0; i < n; i++) {
25             mp[S[i] - D[i]]++;
26         }
27         int maxc = 0;
28         map<int, int>::iterator it;
29         for(it = mp.begin(); it != mp.end(); it++) {
30             if((*it).second > maxc)
31                 maxc = (*it).second;
32         }
33         printf("%d\n", maxc);
34     }    
35     return 0;
36 }

ZOJ 4035 Doki Doki Literature Club

给出单词列表,挑出几个使得满意度最大。

简单贪心,不过坑在排序上,细心分析一下。

 1 #include <cstdio>
 2 #include <cstring>
 3 #include <algorithm>
 4 
 5 using namespace std;
 6 const int wl = 15 + 10;
 7 const int maxw = 100 + 10;
 8 struct Word {
 9     char w[wl];
10     int s;
11     bool operator < (const struct Word &a) const {
12         if(a.s == s) {
13             if(strcmp(a.w, w) > 0)
14                 return 1;
15             else
16                 return 0;
17         }
18         return a.s < s;
19     }
20 }wo[maxw];
21 
22 int n, m;
23 int main()
24 {
25     int T;
26     scanf("%d", &T);
27     while(T--) {
28         scanf("%d%d", &n, &m);
29         for(int i = 1; i <= n; i++) {
30             scanf("%s %d", wo[i].w, &wo[i].s);
31         }
32         
33         sort(wo + 1, wo + n + 1);
34         /*for(int i = 1; i <= n; i++) {
35             printf("%s %d\n", wo[i].w, wo[i].s);
36         }*/
37         long long sc = 0;
38         for(int i = 1; i <= m; i++) {
39             sc += (long long)(m - i + 1) * wo[i].s;
40         }
41         printf("%lld",sc);
42         for(int i = 1; i <= m; i++) {
43             printf(" %s", wo[i].w);
44         }
45         puts("");
46     }    
47     return 0;
48 }

ZOJ 3992 One-Dimensional Maze

给出一个字符数组,问最少需要更改几次字符。

去掉头和尾,直接数一遍,去最小即可。

 1 #include <cstdio>
 2 #include <algorithm>
 3 using namespace std;
 4 
 5 const int maxn = 100000 + 10;
 6 char a[maxn];
 7 int n, m;
 8 
 9 int main()
10 {
11     int T;
12     scanf("%d", &T);
13     while(T--) {
14         scanf("%d%d", &n, &m);
15         scanf(" %s", a+1);
16         int rn = 0;
17         for(int i = 2; i <= m; i++) {
18             if(a[i] == 'R')
19                 rn++;
20         }
21         int ln = 0;
22         for(int i = m; i <= n - 1; i++) {
23             if(a[i] == 'L')
24                 ln++;
25         }
26         printf("%d\n",min(rn, ln));
27     }
28     return 0;
29 } 

ZOJ 3983 Crusaders Quest

给出技能的顺序,问最多能放几次大招。

使用六种按法直接暴力。其中使用了erase方法。

 1 #include <cstdio>
 2 #include <algorithm>
 3 #include <vector>
 4 #include <iostream>
 5 using namespace std;
 6 
 7 int f(vector<char> v, char a, char b, char c) {
 8     int ans = 0;
 9     vector<char> tp = v;
10     
11     int fa = -1;
12     for(int i = 0;  i < tp.size() - 2; i++) {
13         if(tp[i] == a && tp[i + 1] == a && tp[i + 2] == a) {
14             fa = i;
15             break;
16         }
17     }
18     if(fa != -1) {
19         tp.erase(tp.begin() + fa, tp.begin() + fa + 3);
20         ans++;
21     }
22     else {
23         for(int i = 0; i < tp.size(); i++) {
24             if(tp[i] == a){
25                 tp.erase(tp.begin() + i);
26                 i = 0;
27             }
28         }
29     }
30     
31     int fb = -1;
32     for(int i = 0;  i < tp.size() - 2; i++) {
33         if(tp[i] == b && tp[i + 1] == b && tp[i + 2] == b) {
34             fb = i;
35             break;
36         }
37     }
38     if(fb != -1) {
39         tp.erase(tp.begin() + fb, tp.begin() + fb + 3);
40         ans++;
41     }
42     else {
43         for(int i = 0; i < tp.size(); i++) {
44             if(tp[i] == b){
45                 tp.erase(tp.begin() + i);
46                 i = 0;
47             }
48         }
49     }
50     
51     int fc = -1;
52     for(int i = 0;  i < tp.size() - 2; i++) {
53         if(tp[i] == c && tp[i + 1] == c && tp[i + 2] == c) {
54             fc = i;
55             break;
56         }
57     }
58     if(fc != -1) {
59         tp.erase(tp.begin() + fc, tp.begin() + fc + 3);
60         ans++;
61     }
62     else {
63         for(int i = 0; i < tp.size(); i++) {
64             if(tp[i] == c){
65                 tp.erase(tp.begin() + i);
66                 i = 0;
67             }
68         }
69     }
70     
71     return ans;
72 }
73 
74 int main()
75 {
76     int T;
77     char ch;
78     scanf("%d", &T);
79     while(T--) {
80         vector<char> v;
81         vector<int> a;
82         for(int i = 0; i < 9; i++) {
83             scanf(" %c", &ch);
84             v.push_back(ch);
85         }
86         a.push_back(f(v, 'g', 'a', 'o'));
87         a.push_back(f(v, 'g', 'o', 'a'));
88         a.push_back(f(v, 'a', 'g', 'o'));
89         a.push_back(f(v, 'a', 'o', 'g'));
90         a.push_back(f(v, 'o', 'g', 'a'));
91         a.push_back(f(v, 'o', 'a', 'g'));
92         int ans = 0;
93         for(int i = 0; i < a.size(); i++) {
94             ans = max(ans, a[i]);
95         }
96         printf("%d\n",ans);    
97     }
98     return 0;
99 } 

ZOJ 3961 Let's Chat

给出几个集合,问他们相交的集合中大于m的长度之和。

直接暴力。

 1 #include <cstdio>
 2 #include <cstring>
 3 #include <algorithm>
 4 using namespace std;
 5 const int maxn = 100 + 10l;
 6 int n, m, x, y;
 7 struct Node {
 8     int l, r;
 9 }a[maxn], b[maxn];
10 
11 int main()
12 {
13     int T;
14     scanf("%d", &T);
15     while(T--) {
16         scanf("%d%d%d%d", &n, &m, &x, &y);
17         for(int i = 0; i < x; i++) {
18             scanf("%d%d", &a[i].l, &a[i].r);
19         }
20         for(int i = 0; i < y; i++) {
21             scanf("%d%d", &b[i].l, &b[i].r);
22         }
23         
24         
25         int ans = 0;
26         for(int i = 0; i < x; i++) {
27             if(a[i].r - a[i].l + 1 < m)
28                 continue;
29                 
30             for(int j = 0; j < y; j++) {
31                 if(b[j].r - b[j].l + 1 < m)    
32                     continue;
33                     
34                 int L, R;
35                 L = max(a[i].l, b[j].l);
36                 R = min(a[i].r, b[j].r);
37                 int len = R - L + 1;
38                 if(len >= m) {
39                     ans += (len - m + 1);
40                 }
41             }
42         }
43         printf("%d\n", ans);
44     }    
45     return 0;
46 } 

  其中几道区域赛的题和浙江省赛的题,刷题还是很慢呐,不过相比之前还是感觉有进步的,接下来就是尽可能的多熟悉一些算法,多敲模板,找到比赛的感觉。

 

posted @ 2018-10-07 14:31  Reqaw  阅读(250)  评论(0编辑  收藏  举报