codeforces比赛题A. Nineteen,BThree matrices
2014-02-19 10:31
483 查看
1、http://codeforces.com/contest/393/problem/A
题目:
A. Nineteen
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Alice likes word "nineteen" very much. She has a string
s and wants the string to contain as many such words as possible. For that reason she can rearrange the letters of the string.
For example, if she has string "xiineteenppnnnewtnee", she can get string "xnineteenppnineteenw",
containing (the occurrences marked) two such words. More formally, word "nineteen" occurs in the string the number of times you can read it starting from some letter of the string. Of course, you shouldn't skip letters.
Help her to find the maximum number of "nineteen"s that she can get in her string.
Input
The first line contains a non-empty string s, consisting only of lowercase English letters. The length of string
s doesn't exceed 100.
Output
Print a single integer — the maximum number of "nineteen"s that she can get in her string.
Sample test(s)
Input
Output
Input
Output
Input
Output
AC代码:
2、http://codeforces.com/problemset/problem/393/B
B. Three matrices
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Chubby Yang is studying linear equations right now. He came up with a nice problem. In the problem you are given an
n × n matrix
W, consisting of integers, and you should find two
n × n matrices A and
B, all the following conditions must hold:
Aij = Aji, for all
i, j (1 ≤ i, j ≤ n);
Bij = - Bji, for all
i, j (1 ≤ i, j ≤ n);
Wij = Aij + Bij,
for all i, j
(1 ≤ i, j ≤ n).
Can you solve the problem?
Input
The first line contains an integer n
(1 ≤ n ≤ 170). Each of the following n lines contains
n integers. The j-th integer in the
i-th line is Wij
(0 ≤ |Wij| < 1717).
Output
The first n lines must contain matrix
A. The next n lines must contain matrix
B. Print the matrices in the format equal to format of matrix
W in input. It is guaranteed that the answer exists. If there are multiple answers, you are allowed to print any of them.
The answer will be considered correct if the absolute or relative error doesn't exceed
10 - 4.
Sample test(s)
Input
Output
Input
Output
Ac代码:
题目:
A. Nineteen
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Alice likes word "nineteen" very much. She has a string
s and wants the string to contain as many such words as possible. For that reason she can rearrange the letters of the string.
For example, if she has string "xiineteenppnnnewtnee", she can get string "xnineteenppnineteenw",
containing (the occurrences marked) two such words. More formally, word "nineteen" occurs in the string the number of times you can read it starting from some letter of the string. Of course, you shouldn't skip letters.
Help her to find the maximum number of "nineteen"s that she can get in her string.
Input
The first line contains a non-empty string s, consisting only of lowercase English letters. The length of string
s doesn't exceed 100.
Output
Print a single integer — the maximum number of "nineteen"s that she can get in her string.
Sample test(s)
Input
nniinneetteeeenn
Output
2
Input
nneteenabcnneteenabcnneteenabcnneteenabcnneteenabcii
Output
2
Input
nineteenineteen
Output
2
AC代码:
#include<stdio.h> #include<string.h> #include<algorithm> using namespace std; char s[105]; int c[30]; int main() { while(scanf("%s",s)!=EOF) { int len=strlen(s); memset(c,0,sizeof(c)); for(int i=0;i<len;i++) { c[s[i]-'a']++; } int sn=c['n'-'a']; int se=c['e'-'a']; int si=c['i'-'a']; int st=c['t'-'a']; int minn=min(min(se/3,si),st); if((sn-1)/2<minn) printf("%d\n",(sn-1)/2); else printf("%d\n",minn); } return 0; }
2、http://codeforces.com/problemset/problem/393/B
B. Three matrices
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Chubby Yang is studying linear equations right now. He came up with a nice problem. In the problem you are given an
n × n matrix
W, consisting of integers, and you should find two
n × n matrices A and
B, all the following conditions must hold:
Aij = Aji, for all
i, j (1 ≤ i, j ≤ n);
Bij = - Bji, for all
i, j (1 ≤ i, j ≤ n);
Wij = Aij + Bij,
for all i, j
(1 ≤ i, j ≤ n).
Can you solve the problem?
Input
The first line contains an integer n
(1 ≤ n ≤ 170). Each of the following n lines contains
n integers. The j-th integer in the
i-th line is Wij
(0 ≤ |Wij| < 1717).
Output
The first n lines must contain matrix
A. The next n lines must contain matrix
B. Print the matrices in the format equal to format of matrix
W in input. It is guaranteed that the answer exists. If there are multiple answers, you are allowed to print any of them.
The answer will be considered correct if the absolute or relative error doesn't exceed
10 - 4.
Sample test(s)
Input
2 1 4 3 2
Output
1.00000000 3.50000000 3.50000000 2.00000000 0.00000000 0.50000000 -0.50000000 0.00000000
Input
3 1 2 3 4 5 6 7 8 9
Output
1.00000000 3.00000000 5.00000000 3.00000000 5.00000000 7.00000000 5.00000000 7.00000000 9.00000000 0.00000000 -1.00000000 -2.00000000 1.00000000 0.00000000 -1.00000000 2.00000000 1.00000000 0.00000000
Ac代码:
#include<stdio.h> #include<string.h> #include<algorithm> using namespace std; #define N 175 double a ,b ,c ; int main() { int n; while(scanf("%d",&n)!=EOF) { for(int i=1;i<=n;i++) { for(int j=1;j<=n;j++) scanf("%lf",&a[i][j]); } for(int i=1;i<=n;i++) { b[i][i]=a[i][i]; for(int j=i+1;j<=n;j++) { b[i][j]=b[j][i]=(a[i][j]+a[j][i])/2; c[i][j]=a[i][j]-b[i][j]; c[j][i]=-c[i][j]; } } for(int i=1;i<=n;i++) { int flag=0; for(int j=1;j<=n;j++) { if(flag==0) printf("%.8f",b[i][j]),flag=1; else printf(" %.8f",b[i][j]); } printf("\n"); } for(int i=1;i<=n;i++) { int flag=0; for(int j=1;j<=n;j++) { if(flag==0) printf("%.8f",c[i][j]),flag=1; else printf(" %.8f",c[i][j]); } printf("\n"); } } return 0; }
相关文章推荐
- 【codeforces 653A】Bear and Three Balls
- 【CodeForces 574B】Bear and Three Musketeers
- codeforces 51C(Three Base Stations)
- cf B Three matrices
- Codeforces Good Bye 2015 E. New Year and Three Musketeers
- Codeforces 611 E New Year and Three Musketeers
- [2018-3-16]BNUZ套题比赛div2 CodeForces 869B【补】
- [2018-4-8]BNUZ套题比赛div2 CodeForces 960A【补】
- 【CodeForces 635A】 Bear and Three Balls
- CodeForces 574B-Bear and Three Musketeers
- CSU-ACM2017暑假集训比赛3D - D CodeForces - 557C
- 【codeforces】Bear and Three Balls(排序,去重)
- 记第一次codeforces比赛经历
- CodeForces 653 A. Bear and Three Balls——(IndiaHacks 2016 - Online Edition (Div. 1 + Div. 2))
- CodeForces 659B Qualifying Contest(选2个人参加比赛)
- CSU-ACM2017暑假集训比赛2 CodeForces - 724D
- codeforces 591 E. Three States
- CSU-ACM2017暑假集训比赛8 - B - The Two Routes - CodeForces - 601A
- 【codeforces 792C】Divide by Three
- 【14.94%】【codeforces 611E】New Year and Three Musketeers