Compilare: user.cpp: In function ‘int main()’: user.cpp:29:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sirag.in", "r", stdin); ^ user.cpp:30:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sirag.out", "w", stdout); ^ user.cpp:34:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &p); ^ user.cpp:36:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.cpp:57:57: warning: ‘lastMid’ may be used uninitialized in this function [-Wmaybe-uninitialized] res = lastMid * p + lastPos + sp[lastPos] - lastMid * (p - lastPos + 1) - 1; ^ user.cpp:57:62: warning: ‘lastPos’ may be used uninitialized in this function [-Wmaybe-uninitialized] res = lastMid * p + lastPos + sp[lastPos] - lastMid * (p - lastPos + 1) - 1; ^