Compilare: user.cpp: In function ‘int main()’: user.cpp:11:18: warning: unused variable ‘nrc’ [-Wunused-variable] int i, j, lin, nrc = 0; ^ user.cpp:13:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d ", &n, &m); ^ user.cpp:14:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a + 1, n + 2, in); ^ user.cpp:15:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(b + 1, m + 2, in); ^