Codeforces Round #268 (Div. 2)+24 Game
2014-09-22 08:20
295 查看
24 Game
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Little X used to play a card game called "24 Game", but recently he has found it too easy. So he invented a new game.
Initially you have a sequence of n integers: 1, 2, ..., n.
In a single step, you can pick two of them, let's denote them a and b,
erase them from the sequence, and append to the sequence either a + b, or a - b,
or a × b.
After n - 1 steps there is only one number left. Can you make this number equal to 24?
Input
The first line contains a single integer n (1 ≤ n ≤ 105).
Output
If it's possible, print "YES" in the first line. Otherwise, print "NO"
(without the quotes).
If there is a way to obtain 24 as the result number, in the following n - 1 lines
print the required operations an operation per line. Each operation should be in form: "a op b = c".
Where a and b are the numbers you've picked at this
operation; op is either "+", or "-",
or "*";c is the result of corresponding operation. Note,
that the absolute value of c mustn't be greater than 1018.
The result of the last operation must be equal to 24. Separate operator sign and equality sign from numbers with spaces.
If there are multiple valid answers, you may print any of them.
Sample test(s)
input
output
input
output
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Little X used to play a card game called "24 Game", but recently he has found it too easy. So he invented a new game.
Initially you have a sequence of n integers: 1, 2, ..., n.
In a single step, you can pick two of them, let's denote them a and b,
erase them from the sequence, and append to the sequence either a + b, or a - b,
or a × b.
After n - 1 steps there is only one number left. Can you make this number equal to 24?
Input
The first line contains a single integer n (1 ≤ n ≤ 105).
Output
If it's possible, print "YES" in the first line. Otherwise, print "NO"
(without the quotes).
If there is a way to obtain 24 as the result number, in the following n - 1 lines
print the required operations an operation per line. Each operation should be in form: "a op b = c".
Where a and b are the numbers you've picked at this
operation; op is either "+", or "-",
or "*";c is the result of corresponding operation. Note,
that the absolute value of c mustn't be greater than 1018.
The result of the last operation must be equal to 24. Separate operator sign and equality sign from numbers with spaces.
If there are multiple valid answers, you may print any of them.
Sample test(s)
input
1
output
NO
input
8
output
YES
8 * 7 = 56
6 * 5 = 30
3 - 4 = -11 - 2 = -130 - -1 = 3156 - 31 = 25
25 + -1 = 24
解决方案:这题是一道找规律的题目。
code:#include <iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
long long n;
while(~scanf("%lld",&n)){
if(n<4){
printf("NO\n");
}
else{
printf("YES\n");
if(n%2==0){
printf("1 * 2 = 2\n");
printf("2 * 3 = 6\n");
printf("6 * 4 = 24\n");
for(long long i=5;i<=n;i+=2){
printf("%I64d - %I64d = 1\n",i+1,i);
if(i+2<=n)
printf("1 * %I64d = %I64d\n",i+2,i+2);
else{
printf("1 * 24 = 24\n");
}
}
}
else{
printf("5 - 1 = 4\n");
printf("4 - 2 = 2\n");
printf("2 * 3 = 6\n");
printf("6 * 4 = 24\n");
for(long long i=6;i<=n;i+=2){
printf("%I64d - %I64d = 1\n",i+1,i);
if(i+2<=n)
printf("1 * %I64d = %I64d\n",i+2,i+2);
else{
printf("1 * 24 = 24\n");
}
}
}
}
}
return 0;
}
相关文章推荐
- 【Codeforces Round #268 (Div. 1)】A. 24 Game【归纳法】
- Codeforces Round #268 (Div. 1)A. 24 Game
- Codeforces Round#268(Div 2)C 24 Game
- Codeforces Round #268 (Div. 1)A. 24 Game
- Codeforces Round#268(Div 2)C 24 Game
- Codeforces Round #268 (Div. 2) C 24 Game
- Codeforces Round #268 (Div. 1) A. 24 Game 构造
- Codeforces Round #268 (Div. 2) C 24 Game [构造]
- Codeforces Round #426 (Div. 2) C:The Meaningless Game(思维)
- Codeforces Round #267 (Div. 2) B. Fedor and New Game(位运算)
- LINTCODE——Compute 24 Game
- 679. 24 Game
- CF —— Codeforces Round #428 (Div. 2) B. Game of the Rows
- Codeforces Round #376 (Div. 2) E. Funny Game
- Codeforces Round #430 (Div. 2) E. Nikita and game
- Codeforces 469C 24 Game【思维+模拟】
- leetcode 24 Game
- 24 Game
- Codeforces Round #419 (Div. 2) C.Karen and Game 思维
- Educational Codeforces Round 24 E. Card Game Again(双指针)