Compilare: user.cpp: In function ‘void FindCycle()’: user.cpp:99:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < vec[i].size(); k++) { ^ user.cpp: In function ‘void RootCycle()’: user.cpp:183:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < vec[i].size(); k++) { ^ user.cpp: In function ‘void PresolveTree()’: user.cpp:209:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < sons[i].size(); k++) { ^ user.cpp: In function ‘void SolveCycle()’: user.cpp:242:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (sw = 0, k = 0; k < vec[C[2]].size(); k++) ^ user.cpp:275:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < vec[C[i]].size(); k++) ^ user.cpp: In function ‘void SolveTree()’: user.cpp:358:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < sons[i].size(); k++) { ^ user.cpp: In function ‘void CheckSolution()’: user.cpp:371:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (g = k = 0; k < vec[i].size(); k++) { ^ user.cpp: In function ‘void ComputeInv()’: user.cpp:57:50: warning: array subscript is below array bounds [-Warray-bounds] extended_gcd(fact[MOD - 1], MOD, factinv[MOD - 1], garbage); ^