Compilare: user.cpp: In function ‘void c3()’: user.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int g=0;g<cu[j].size();g++) ~^~~~~~~~~~~~~ user.cpp:30:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int g=0;g<fara[j].size();g++) ~^~~~~~~~~~~~~~~ user.cpp:44:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int g=0;g<cu[j].size();g++) ~^~~~~~~~~~~~~ user.cpp:56:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int g=0;g<fara[j].size();g++) ~^~~~~~~~~~~~~~~ user.cpp: In function ‘void c2()’: user.cpp:72:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(max(cu[j].size(),fara[j].size())>mx) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ user.cpp:78:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(max(cu[j].size(),fara[j].size())==mx) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~ user.cpp: In function ‘void c1()’: user.cpp:91:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(max(cu[j].size(),fara[j].size())>mx) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ user.cpp: In function ‘void precalc()’: user.cpp:121:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<fara[i-1].size();j++) ~^~~~~~~~~~~~~~~~~ user.cpp:126:8: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(is_prime[i]) ^~ user.cpp:128:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ int s=sqrt(i); ^~~ user.cpp:142:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int g=0;g<cu[i/j].size();g++) ~^~~~~~~~~~~~~~~ user.cpp:152:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(g=0;g<cu[i/j].size();g++) ~^~~~~~~~~~~~~~~