Compilare: main.cpp: In function 'bool ok(int)': main.cpp:12:13: warning: unused variable 'c' [-Wunused-variable] int c=0,ans=0; ^ main.cpp:12:17: warning: unused variable 'ans' [-Wunused-variable] int c=0,ans=0; ^~~ main.cpp: In function 'int main()': main.cpp:31:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("slidingwindow.in","r",stdin); ^ main.cpp:32:48: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("slidingwindow.out","w",stdout); ^ main.cpp:34:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&d); ^ main.cpp:37:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^