Compilare: user.cpp: In function ‘void Print()’: user.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<vcs.size(); i++) ^ user.cpp: In function ‘void Path()’: user.cpp:51:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<strlen(tmp); i++) ^ user.cpp: In function ‘void Solve()’: user.cpp:100:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<strlen(tmp); i++) ^ user.cpp: In function ‘int main()’: user.cpp:118:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dir.in", "r", stdin); ^ user.cpp:119:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dir.out", "w", stdout); ^ user.cpp:120:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(tmp); ^ /tmp/cciJf7tJ.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.