Compilare: user.cpp: In function ‘void tarjan(int)’: user.cpp:34:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();++i) { ^ user.cpp: In function ‘void DFS(int, int)’: user.cpp:66:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();++i) { ^ user.cpp: In function ‘bool multimeB(int)’: user.cpp:80:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();++i) { ^ user.cpp: In function ‘bool multimeC(int)’: user.cpp:96:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();++i) { ^ user.cpp:99:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[y].size();++j) { ^