1104 Sum of Number Segments (20分)(long double)
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1104 Sum of Number Segments (20分)
Given a sequence of positive numbers, a segment is defined to be a consecutive subsequence. For example, given the sequence { 0.1, 0.2, 0.3, 0.4 }, we have 10 segments: (0.1) (0.1, 0.2) (0.1, 0.2, 0.3) (0.1, 0.2, 0.3, 0.4) (0.2) (0.2, 0.3) (0.2, 0.3, 0.4) (0.3) (0.3, 0.4) and (0.4).
Now given a sequence, you are supposed to find the sum of all the numbers in all the segments. For the previous example, the sum of all the 10 segments is 0.1 + 0.3 + 0.6 + 1.0 + 0.2 + 0.5 + 0.9 + 0.3 + 0.7 + 0.4 = 5.0.
Input Specification:
Each input file contains one test case. For each case, the first line gives a positive integer N, the size of the sequence which is no more than 1. The next line contains N positive numbers in the sequence, each no more than 1.0, separated by a space.
Output Specification:
For each test case, print in one line the sum of all the numbers in all the segments, accurate up to 2 decimal places.
Sample Input:
4
0.1 0.2 0.3 0.4
Sample Output:
5.00
long double的输出方式为 "%Lf"
1 #include <cstdio> 2 using namespace std; 3 4 const int maxn = 1e5 + 5; 5 int n; 6 double val[maxn]; 7 8 int main() { 9 scanf("%d", &n); 10 for(int i = 0; i < n; i ++) { 11 scanf("%lf", &val[i]); 12 } 13 long double sum = 0; 14 for(int i = 0; i < n; i ++) { 15 sum += val[i] * (i + 1) * (n - i); 16 } 17 printf("%.2Lf ", sum); 18 return 0; 19 }
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