Compilare: user.cpp: In function ‘void test()’: user.cpp:64:76: warning: suggest parentheses around assignment used as truth value [-Wparentheses] comps[i].clear(), vis[i] = comp[i] = reachFrom1[i] = reachesEnd[i] = mask[i] = 0; ^ user.cpp:64:34: warning: suggest parentheses around assignment used as truth value [-Wparentheses] comps[i].clear(), vis[i] = comp[i] = reachFrom1[i] = reachesEnd[i] = mask[i] = 0; ^ In file included from /usr/include/c++/4.8/cassert:43:0, from user.cpp:4: user.cpp:83:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(vf.size() == N); ^