Compilare: user.cpp: In function ‘int main()’: user.cpp:13:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("fsb.in" , "r" , stdin ) ; ^ user.cpp:14:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("fsb.out" , "w" , stdout ) ; ^ user.cpp:15:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n" , &n ) ; ^ user.cpp:16:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets ( sir+1 ) ; ^ user.cpp:27:33: warning: array subscript is above array bounds [-Warray-bounds] sol = sol + fv [ 0 + 200007 ] +( fv [ 0 + 200007 ]*( fv [ 0 + 200007 ] - 1 ) / 2 ) ; ^ /tmp/ccxwYVQZ.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.