Compilare: user.cpp: In function ‘bool parallel_bfs(int, int)’: user.cpp:68:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (edg_ptr_tmp[ta] < g[ta].size() && f[g[ta][edg_ptr_tmp[ta]].v] == fptr && g[ta][edg_ptr_tmp[ta]].idx <= dr_slide) ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ user.cpp:70:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (edg_ptr_tmp[ta] == g[ta].size() || g[ta][edg_ptr_tmp[ta]].idx > dr_slide) { ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~ user.cpp:74:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (edg_ptr_tmp[tb] < g[tb].size() && f[g[tb][edg_ptr_tmp[tb]].v] == fptr && g[tb][edg_ptr_tmp[tb]].idx <= dr_slide) ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ user.cpp:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (edg_ptr_tmp[tb] == g[tb].size() || g[tb][edg_ptr_tmp[tb]].idx > dr_slide) { ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~ user.cpp:81:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (edg_ptr_global[va] < g[va].size() && g[va][edg_ptr_global[va]].idx < st_slide) ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ user.cpp:86:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (edg_ptr_global[vb] < g[vb].size() && g[vb][edg_ptr_global[vb]].idx < st_slide) ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:137:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nespus.in", "r", stdin); ^ user.cpp:138:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nespus.out", "w", stdout); ^ user.cpp: In function ‘char next_ch()’: user.cpp:33:30: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, BMAX, stdin); ^