Compilare: user.cpp: In function ‘void df(int)’: user.cpp:24:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[nod].size(); ++i) ^ user.cpp:51:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[nod].size(); ++i) ^ user.cpp:72:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[nod].size(); ++i) ^ user.cpp:89:72: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < stCresc[whatStackCresc[a[nod][i]]].size(); ++k) ^ user.cpp:115:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < stDesc[whatStackDesc[a[nod][i]]].size(); ++k) ^ user.cpp:135:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;step <= stCresc[whatStackCresc[nod]].size(); step *= 2); ^ user.cpp:138:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos + step < stCresc[whatStackCresc[nod]].size() && ^ user.cpp:145:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((pos && stCresc[whatStackCresc[nod]].size() - 1 == pos) ^ user.cpp:164:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;step <= stDesc[whatStackDesc[nod]].size(); step *= 2); ^ user.cpp:168:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos + step < stDesc[whatStackDesc[nod]].size() && ^ user.cpp:175:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((pos && stDesc[whatStackDesc[nod]].size() - 1 == pos) ^ user.cpp:200:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(stCresc[whatStackCresc[k]].size() > solMax) ^ user.cpp:205:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(stDesc[whatStackDesc[k]].size() > solMax) ^