Compilare: main.cpp: In function 'int main()': main.cpp:72:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < q.size(); i++) ~~^~~~~~~~~~ main.cpp:76:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < q.size(); i++) ~~^~~~~~~~~~ main.cpp:63:16: warning: variable 'x' set but not used [-Wunused-but-set-variable] int i, s = 0, x; ^