Compilare: user.cpp: In function ‘int main()’: user.cpp:14:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv4.in","r",stdin); ^ user.cpp:17:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n",&n,&l,&r); ^ user.cpp:18:131: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i = 1;i <= n;++i) scanf("%f",s+i),semn[i] = semn[i-1] ^ ((bool)(s[i] < 0)),s[i] = abs(s[i]),s[i] = s[i-1] + log(s[i]); ^ user.cpp:43:20: warning: ‘u’ may be used uninitialized in this function [-Wmaybe-uninitialized] return fo << (u-p+1) << ' ' << p << '\n',0; ^ user.cpp:43:36: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] return fo << (u-p+1) << ' ' << p << '\n',0; ^