Compilare: user.cpp: In function ‘int main()’: user.cpp:150:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < path2.size(); i++) { ~~^~~~~~~~~~~~~~ user.cpp: In function ‘char nextch()’: user.cpp:15:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, fi); ^ user.cpp: In function ‘int main()’: user.cpp:82:27: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] nod = from[id][nod]; ~~~~~~~~~~~~^ user.cpp:136:13: note: ‘id’ was declared here int id; ^~