Compilare: user.cpp: In function ‘int main()’: user.cpp:233:9: warning: unused variable ‘b’ [-Wunused-variable] int b = 4 / a; ^ user.cpp:206:6: warning: unused variable ‘max’ [-Wunused-variable] int max = 0; ^ user.cpp:109:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN_FILE_NAME, "r", stdin); ^ user.cpp:110:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT_FILE_NAME, "w", stdout); ^ user.cpp:113:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:124:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", line); ^