Compilare: user.cpp: In function ‘int main()’: user.cpp:70:17: warning: variable ‘ai’ set but not used [-Wunused-but-set-variable] int ans = 1e9, ai, aj; ^~ user.cpp:70:21: warning: variable ‘aj’ set but not used [-Wunused-but-set-variable] int ans = 1e9, ai, aj; ^~ user.cpp:37:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.in", "r", stdin); ^ user.cpp:38:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.out", "w", stdout); ^