Compilare: user.cpp: In function ‘void solve()’: user.cpp:41:9: warning: unused variable ‘i’ [-Wunused-variable] int i, nr = 0, k = 0; ^ user.cpp: In function ‘void read()’: user.cpp:18:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reteta2.in", "r", stdin); ^ user.cpp:19:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reteta2.out", "w", stdout); ^ user.cpp:20:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/cckKqKDW.o: In function `read()': user.cpp:(.text+0x6d): warning: the `gets' function is dangerous and should not be used.