Compilare: user.cpp: In function ‘void afis(int, int)’: user.cpp:76:13: warning: unused variable ‘cv’ [-Wunused-variable] int cv = v[i]; ^~ user.cpp: In function ‘int main()’: user.cpp:128:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(re, "%lld %lld %lld", &n, &m, &k); ^ user.cpp:131:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(re, "%lld", &v[i]); ^ user.cpp:136:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(re, "%d %d", &a, &b); ^