Compilare: user.cpp: In function ‘int main()’: user.cpp:54:18: warning: unused variable ‘iv’ [-Wunused-variable] int i, j, k, iv, jv, d; ^ user.cpp:54:22: warning: unused variable ‘jv’ [-Wunused-variable] int i, j, k, iv, jv, d; ^ user.cpp:54:26: warning: unused variable ‘d’ [-Wunused-variable] int i, j, k, iv, jv, d; ^ user.cpp:58:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &M, &N, &K); ^ user.cpp:61:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &a[i][j]); ^