#include<iostream> #include<algorithm> #include<vector> #include<string> using namespace std; /* 输入用例: 目标信号值,下一行输入频段和损失值 freq:loss 找出距离最近的频段,输出损失值,保留一位小数, 2800 1950:10,3000:9,2500:15 */ int main() { int freq; cin >> freq; string str; cin >> str; vector<s...