Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:155:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < q[x].size(); j++){ ^ user.cpp:160:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < q[x].size(); j++){ ^ user.cpp: In function ‘int num()’: user.cpp:114:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM2, fin); ^ user.cpp:123:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM2, fin); ^ user.cpp: In function ‘int main()’: user.cpp:130:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir, 1, DIM2, fin); ^