Compilare: user.cpp: In function ‘void dynamics()’: user.cpp:153:9: warning: unused variable ‘j’ [-Wunused-variable] int j; ^ user.cpp: In function ‘void readFile()’: user.cpp:55:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d\n", &n, &l); ^ user.cpp:60:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 1009, f); ^ user.cpp:67:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &costBit[i]);//, printf("%lld ", costBit[i]); ^