Compilare: user.cpp: In function ‘int main()’: user.cpp:76:15: warning: unused variable ‘left’ [-Wunused-variable] int i, j, left, right; ^ user.cpp:76:21: warning: unused variable ‘right’ [-Wunused-variable] int i, j, left, right; ^ user.cpp: In function ‘std::pair<double, double> read()’: user.cpp:20:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:74:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("adapost.in", "r", stdin); ^ user.cpp:75:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("adapost.out", "w", stdout); ^ user.cpp:78:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp: In function ‘double bs(double, double)’: user.cpp:66:12: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^