Compilare: user.cpp: In function ‘int main()’: user.cpp:29:13: warning: unused variable ‘i’ [-Wunused-variable] int n, l, i, j, ans = 0; ^ user.cpp:29:16: warning: unused variable ‘j’ [-Wunused-variable] int n, l, i, j, ans = 0; ^ user.cpp:29:19: warning: unused variable ‘ans’ [-Wunused-variable] int n, l, i, j, ans = 0; ^ user.cpp:27:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interzis.in", "r", stdin); ^ user.cpp:28:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interzis.out", "w", stdout); ^ user.cpp:30:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d ", &n, &l); ^ user.cpp:31:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ /tmp/ccnrsAsz.o: In function `main': user.cpp:(.text.startup+0x6f): warning: the `gets' function is dangerous and should not be used.