Compilare: user.cpp: In function ‘void precalc()’: user.cpp:57:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < timp[i].size(); ++j) ^ user.cpp:60:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; j < timp[i].size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:114:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < timp[i].size() - 1; ++j) ^