Compilare: user.cpp: In function ‘int main()’: user.cpp:10:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, p, q, M1, M2, M3, sum=0, st=0, ok=0; ^ user.cpp:10:15: warning: unused variable ‘p’ [-Wunused-variable] int i, j, p, q, M1, M2, M3, sum=0, st=0, ok=0; ^ user.cpp:10:18: warning: unused variable ‘q’ [-Wunused-variable] int i, j, p, q, M1, M2, M3, sum=0, st=0, ok=0; ^ user.cpp:11:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d\n", &N); ^ user.cpp:13:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &V[i]); ^