Compilare: main.cpp: In function 'void grundy(int*, int)': main.cpp:27:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; prime[j]<=i and j<prime.size(); j++) ~^~~~~~~~~~~~~ main.cpp:31:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<mex.size(); j++){ ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:19: warning: unused variable 'max' [-Wunused-variable] int n, i, max=0; ^~~