Compilare: user.cpp: In function ‘void markbfs(int)’: user.cpp:26:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<muchiirev[now].size();i++) ^ user.cpp: In function ‘void mark(int)’: user.cpp:82:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<muchii[now].size();i++) ^ user.cpp: In function ‘void analyze(int)’: user.cpp:116:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<chains[nod].size();i++) ^ user.cpp:126:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v.size();i++) ^ user.cpp:134:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i1=0;i1<chains[to].size();i1++) ^ user.cpp: In function ‘int main()’: user.cpp:187:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i1=0;i1<muchii[i].size();i1++) ^