Compilare: user.cpp: In function ‘int main()’: user.cpp:56:34: warning: format ‘%c’ expects argument of type ‘char*’, but argument 2 has type ‘int*’ [-Wformat=] scanf("%c",&mat[i][j]); ^ user.cpp: In function ‘int verific(int)’: user.cpp:38:28: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] int i,s=0,nr=v[i].size(); ^