Compilare: main.cpp: In function 'long long int Primeb(int, int)': main.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < prime.size() ; i++ ) ~~^~~~~~~~~~~~~~ main.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < primeb.size() ; j++ ) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:55:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &n ) ; ^ main.cpp:57:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &a, &b ) ; ^