Compilare: user.cpp: In function ‘int main()’: user.cpp:41:15: warning: unused variable ‘max1’ [-Wunused-variable] int n, m, max1, lim1 = 13, lim2 = 175, x, k = 40; ^ user.cpp:41:21: warning: unused variable ‘lim1’ [-Wunused-variable] int n, m, max1, lim1 = 13, lim2 = 175, x, k = 40; ^ user.cpp: In function ‘char read_ch()’: user.cpp:18:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(_in_buff, 1, 4096, _fin); ^ user.cpp: In function ‘int main()’: user.cpp:40:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("exp.out", "w", stdout); ^