Compilare: user.cpp: In function ‘int main()’: user.cpp:18:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch; ^ user.cpp:25:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d\n", &N, &M); ^ user.cpp:26:22: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, N, f); ^ user.cpp:66:9: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] while (i <= poz) { ^