57 lines
841 B
C++
57 lines
841 B
C++
#include <deque>
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#include <fstream>
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#include <iostream>
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#include <set>
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#include <string>
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#include <vector>
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bool Unique(const std::deque<char> &buf)
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{
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std::set<char> s;
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for(const char &ch : buf)
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s.insert(ch);
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return (s.size() == 4);
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}
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int main()
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{
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std::ifstream ifs("data.txt");
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if(!ifs.is_open())
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{
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std::cerr << "Missing data.txt." << std::endl;
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return -1;
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}
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for(std::string line; std::getline(ifs, line); )
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{
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if(line == "")
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continue;
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std::deque<char> buf;
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int idx = 0;
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for(const char &ch : line)
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{
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++idx;
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buf.push_back(ch);
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if(buf.size() >= 4)
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{
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while(buf.size() > 4)
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buf.pop_front();
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if(Unique(buf))
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{
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std::cout << "At index " << idx << ": ";
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for(const char &ch : buf)
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std::cout << ch;
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std::cout << std::endl;
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break;
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}
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}
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}
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}
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return 0;
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}
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