Compilare: main.cpp: In function 'bool C(std::vector<int>&, int&)': main.cpp:17:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (s+2 <= v.size()) { ~~~~^~~~~~~~~~~ main.cpp: In function 'bool B(std::vector<int>&, int&)': main.cpp:38:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s + 1 < v.size()) { ~~~~~~^~~~~~~~~~ main.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (s + 4 <= v.size()) { ~~~~~~^~~~~~~~~~~ main.cpp: In function 'int perle(std::vector<int>&, int&)': main.cpp:65:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[v.size() - 1] == 2 && v.size()==s) { return 1; } ~~~~~~~~^~~ main.cpp:66:68: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (v[v.size() - 2] == 2 && v[v.size() - 3] == 1 && v.size()==s+2) { return 1; } ~~~~~~~~^~~~~ main.cpp:67:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(s < v.size()){ ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:107:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (perle(v, s) == 1 || s == v.size()) { cout << 1 << endl; } ~~^~~~~~~~~~~