#include <iostream> #include <string> #include <algorithm> using namespace std; int main() { int t, n; size_t bstart {}, bend {}; string s; cin >> t; while(t--) { cin >> n; cin.ignore(); // 忽略前一个输入后的换行符 getline(cin, s); while (true) { bstart = s.find(' '); if (bstart ==...