The ? 1 ? 2 ? ... ? n = k problem
The ? 1 ? 2 ? ... ? n = k problem |
The problem
Given the following formula, one can set operators '+' or '-' instead of each '?', in order to obtain a given k
? 1 ? 2 ? ... ? n = k
For example: to obtain k = 12 , the expression to be used will be:
- 1 + 2 + 3 + 4 + 5 + 6 - 7 = 12
with n = 7
The Input
The first line is the number of test cases, followed by a blank line.
Each test case of the input contains integer k (0<=|k|<=1000000000).
Each test case will be separated by a single line.
The Output
For each test case, your program should print the minimal possible n (1<=n) to obtain k with the above formula.
Print a blank line between the outputs for two consecutive test cases.
Sample Input
2 12 -3646397
Sample Output
7 2701
#include <stdio.h> #include <math.h> int main(void) { int i,n,flag,k; scanf("%d",&n); while(n--) { scanf("%d",&k); if(k<0) k=-k; if(!k) printf("3\n"); else { i=sqrt(2*k)-1;//考虑到 k==0 的情况!!! while((i*(i+1)/2-k)%2||(i*(i+1)/2)<k) i++; printf("%d\n",i); } if(n) printf("\n"); } return 0; }
The ? 1 ? 2 ? ... ? n = k problem
The ? 1 ? 2 ? ... ? n = k problem |
The problem
Given the following formula, one can set operators '+' or '-' instead of each '?', in order to obtain a given k
? 1 ? 2 ? ... ? n = k
For example: to obtain k = 12 , the expression to be used will be:
- 1 + 2 + 3 + 4 + 5 + 6 - 7 = 12
with n = 7
The Input
The first line is the number of test cases, followed by a blank line.
Each test case of the input contains integer k (0<=|k|<=1000000000).
Each test case will be separated by a single line.
The Output
For each test case, your program should print the minimal possible n (1<=n) to obtain k with the above formula.
Print a blank line between the outputs for two consecutive test cases.
Sample Input
2 12 -3646397
Sample Output
7 2701