Compilare: user.cpp: In function ‘void read()’: user.cpp:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:44: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:67: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int solveQuery(int*)’: user.cpp:82: warning: comparison between signed and unsigned integer expressions user.cpp:92: warning: comparison between signed and unsigned integer expressions /tmp/ccXX7Kx7.o: In function `read()': user.cpp:(.text+0x3c4): warning: the `gets' function is dangerous and should not be used.