http://120.78.162.102/problem.php?cid=1432&pid=7

http://120.78.162.102/problem.php?id=6244

題解：用計(jì)算器按了幾下，發(fā)現(xiàn)就是求x*v和y*v的和再分別除以v，四舍五入

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=10000; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,q;int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endifscanf("%d",&t);while(t--){scanf("%d",&n);ll sum1=0,sum2=0,sum3=0;for(int i=1;i<=n;i++){scanf("%d%d%d",&m,&k,&q);sum1+=m*q;sum2+=k*q;sum3+=q;}printf("%.2f %.2f\n",(double)sum1/sum3,(double)sum2/sum3);}//cout << "Hello world!" << endl;return 0; }

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