Compilare: user.cpp: In function ‘int split_lines(int, int, int, int, int)’: user.cpp:107:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘int main()’: user.cpp:187:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rama.in","r",stdin); ^ user.cpp:188:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rama.out","w",stdout); ^ user.cpp:190:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &n, &m); ^ user.cpp:192:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s[i] + 1); ^