HDU 3082 水

#include <iostream>using namespace std;int main(){int t;cin >> t;while(t--){char buf[120];int n; cin >> n;int dz[22];for(int j = 0; j < n; j++){int cnt = 0;int a=0, sum = 0;getchar(); //非常重要gets(buf);int len = strlen(buf);for(int i = 0; i < len; i++){if(isdigit(buf[i])){a  = a * 10 + buf[i] - '0';}else{sum += a;a  = 0;}}dz[j] = sum;}double result = 0;for(int i = 0 ; i < n; i++){result += 1.0 / dz[i];}result = 1.0 / result;printf("%.2lf\n", result);}return 0;}