Compilare: user.cpp: In lambda function: user.cpp:120:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (idxStr < N && idxCuv < cuv.length()) { ~~~~~~~^~~~~~~~~~~~~~ user.cpp:132:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (idxCuv != cuv.length()) { ~~~~~~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:63:12: warning: unused variable ‘start’ [-Wunused-variable] int N, start = 0; ^~~~~