Compilare: main.cpp: In function 'int main()': main.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < b.size() ; f ++) ~~^~~~~~~~~~ main.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < v.size() && f < 1000 ; f ++) ~~^~~~~~~~~~ main.cpp:31:13: warning: unused variable 's' [-Wunused-variable] int s = 0 ; ^ main.cpp:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < v.size() && f < 1000 ; f ++) ~~^~~~~~~~~~