Compilare: user.cpp: In function ‘void gctc()’: user.cpp:46:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<g[i].size();j++){ ^ user.cpp: In function ‘int main()’: user.cpp:90:17: warning: unused variable ‘j’ [-Wunused-variable] int i,m,x,y,j; ^ In file included from /usr/include/string.h:642:0, from user.cpp:4: In function ‘void* memset(void*, int, size_t)’, inlined from ‘void BFS(int)’ at user.cpp:56:30: /usr/include/i386-linux-gnu/bits/string3.h:82:32: warning: call to ‘__warn_memset_zero_len’ declared with attribute warning: memset used with constant zero length parameter; this could be due to transposed parameters [enabled by default] __warn_memset_zero_len (); ^ /tmp/ccWtcION.o: In function `BFS(int)': user.cpp:(.text+0x418): warning: memset used with constant zero length parameter; this could be due to transposed parameters