Compilare: user.cpp: In function ‘int main()’: user.cpp:12:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(i=2;i<=N;++i) ^~~ user.cpp:19:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ printf("%d",c); ^~~~~~ user.cpp:7:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciur.in","r",stdin); ^ user.cpp:8:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciur.out","w",stdout); ^ user.cpp:9:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^