Compilare: user.cpp: In function ‘int main()’: user.cpp:12:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j = -1, numw = 0, nume = 0, intW, extE, l, ans = (1ll << 31) - 1, st, dr; ^ user.cpp:12:20: warning: unused variable ‘numw’ [-Wunused-variable] int i, j = -1, numw = 0, nume = 0, intW, extE, l, ans = (1ll << 31) - 1, st, dr; ^ user.cpp:14:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("weeee.in", "r", stdin); ^ user.cpp:15:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("weeee.out", "w", stdout); ^ user.cpp:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n", &n); ^ user.cpp:18:13: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (s); ^ /tmp/ccWeqV8I.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.