Compilare: user.cpp: In function ‘int main()’: user.cpp:38:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c!=n*n) ^ user.cpp:48:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c==n*n) break; ^ user.cpp:80:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l==n*n) break; ^ user.cpp:83:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=1;k<=c;k++) ^ user.cpp:9:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("asteptare.in","r",stdin); ^ user.cpp:10:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("asteptare.out","w",stdout); ^ user.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^