Borderou de evaluare (job #475583)

Eroare de compilare: user.cpp: In function ‘std::string prel(std::string)’: user.cpp:14:10: error: ‘std::string’ has no member named ‘pop_back’ user.cpp:16:36: error: ‘std::string’ has no member named ‘pop_back’ user.cpp: In function ‘void ls(std::string, int, int, int, int)’: user.cpp:30:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:38:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp:42:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘int main()’: user.cpp:51:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:57:22: error: ‘std::string’ has no member named ‘pop_back’ user.cpp:59:26: error: ‘std::string’ has no member named ‘pop_back’ user.cpp:78:22: error: ‘std::string’ has no member named ‘pop_back’ user.cpp:80:26: error: ‘std::string’ has no member named ‘pop_back’ user.cpp:81:22: error: ‘std::string’ has no member named ‘pop_back’ user.cpp:86:22: error: ‘std::string’ has no member named ‘pop_back’ user.cpp: In function ‘bool ok(std::string, int)’: user.cpp:27:1: warning: control reaches end of non-void function [-Wreturn-type]