Compilare: user.cpp: In function ‘int main()’: user.cpp:16:13: warning: unused variable ‘l’ [-Wunused-variable] int n, k, l, i, j; ^ user.cpp:17:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:18:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &k); ^ user.cpp:20:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &a[dv], &b[dv]); ^ user.cpp:24:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &k); ^ user.cpp:26:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &a[dv], &b[dv]); ^ user.cpp:34:11: warning: ‘cr’ may be used uninitialized in this function [-Wmaybe-uninitialized] int cd, cr; ^