Compilare: user.cpp: In function ‘int main()’: user.cpp:183:10: warning: unused variable ‘j’ [-Wunused-variable] int i, j, flag; ^ user.cpp:188:13: warning: unused variable ‘inc’ [-Wunused-variable] long long inc = 0; ^ user.cpp:186:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qnp.out", "w", stdout); ^ user.cpp:191:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &M); ^ user.cpp:195:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &freq[i]); ^ user.cpp:198:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &K); ^