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- #include <stdio.h>
- int main() {
- int n,i,j;
- double sum = 0.0;
- scanf("%d", &n);
- for (i = 1; i <= n; i++) {
- double temp = 0.0;
- for (j = 1; j <= i; j++) {
- temp += j;
- }
- sum += 1.0 / temp;
- }
- printf("%.4f\n", sum);
- return 0;
- }
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