Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the string.

Complete the following file:

prog.cpp

#include <iostream> #include <string> #include <sstream> using namespace std; /** Returns the index of the first occurrence of t in s, or -1 if t doesn't occur in s. */ int find(string s, string t) { for (int i = 0; i + t.length() < s.length(); i++) { if (s.substr(i, t.length()) == t) { return i; } } return -1; } string firstRepeatedSomewhere(string s) {
}