Compilare: main.cpp: In function 'void dft(int, int, int)': main.cpp:46:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void fft(int, int)': main.cpp:63:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[R].size();i++) ~^~~~~~~~~~~~ main.cpp:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[x].size();j++) ~^~~~~~~~~~~~ main.cpp:86:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0;it<ad[R].size();it++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:212:9: warning: variable 'afis' set but not used [-Wunused-but-set-variable] int afis; ^~~~