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- #include <stdio.h>
- int main() {
- int n;
- scanf("%d", &n);
- float result = 1;
- for(int i = 2; i <= n; i++) {
- if(i % 2 == 0) {
- result -= 1.0 / (float) (i);
- }
- else {
- result += 1.0 / (float) (i);
- }
- }
- printf("%f\n", result);
- return 0;
- }
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