Compilare: user.cpp: In function ‘void newChain(int)’: user.cpp:43:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<g[i].size(); j++) ^ user.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<g[x].size(); j++) ^ user.cpp: In function ‘int solveChain()’: user.cpp:90:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[x].size(); ++i) ^ user.cpp: In function ‘int solve()’: user.cpp:118:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<g[i].size(); j++) ^ user.cpp:131:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<g[nod].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:156:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y; ^