Compilare: user.cpp: In function ‘int main()’: user.cpp:31:28: warning: unused variable ‘j’ [-Wunused-variable] int pos, len, i, last, j; ^ user.cpp:29:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("propozitie.in", "r", stdin); ^ user.cpp:30:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("propozitie.out", "w", stdout); ^ user.cpp:33:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n%s", &len, &k, txt + 1); ^ user.cpp: In function ‘int bs(int, int, int)’: user.cpp:25:12: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^ user.cpp: In function ‘int main()’: user.cpp:42:37: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] d[i] = (2 * d[i - 1] - d[pos] + 1) % MOD; ^