Compilare: main.cpp: In function 'int main()': main.cpp:34:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (a%2==0) ^~ main.cpp:36:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' while (v[a]==1) ^~~~~ main.cpp:7:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("difprim.in","r",stdin); ^ main.cpp:8:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("difprim.out","w",stdout); ^ main.cpp:10:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&a,&b); ^