Compilare: user.cpp: In function ‘int main()’: user.cpp:19:19: warning: unused variable ‘j’ [-Wunused-variable] int n, m, a, i, j, l, c; ^ user.cpp:20:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &n, &m, &a); ^ user.cpp:22:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &v1[i]); ^ user.cpp:24:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &v2[i]); ^