Compilare: user.cpp: In function ‘int main()’: user.cpp:9:24: warning: unused variable ‘k’ [-Wunused-variable] int n,i,j,aux,nr=0,k; ^ user.cpp:7:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrtri.in","r",stdin); ^ user.cpp:8:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrtri.out","w",stdout); ^ user.cpp:37:21: warning: ‘mij’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[mij]+v[j]>=v[i]) ~~~~~^