#includeint main(void) { int n; scanf("%d",&n); int fm = 1; int fz = 1; int fh = 1; double sum = 0; for(int i=1;i<=n;i++) { fz = i; fm = 2*i-1; sum = sum + fh * (fz*1.0/fm*1.0); fh = -fh; } printf("%.3f",sum); return 0; }
#includeint main(void) { int n; scanf("%d",&n); int fm = 1; int fz = 1; int fh = 1; double sum = 0; for(int i=1;i<=n;i++) { fz = i; fm = 2*i-1; sum = sum + fh * (fz*1.0/fm*1.0); fh = -fh; } printf("%.3f",sum); return 0; }
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