Compilare: user.cpp: In function ‘int main()’: user.cpp:26:34: warning: unused variable ‘l’ [-Wunused-variable] int n,m,l1,c1,l2,c2,j,cost,i,l,c,x; ^ user.cpp:26:36: warning: unused variable ‘c’ [-Wunused-variable] int n,m,l1,c1,l2,c2,j,cost,i,l,c,x; ^ user.cpp:26:38: warning: unused variable ‘x’ [-Wunused-variable] int n,m,l1,c1,l2,c2,j,cost,i,l,c,x; ^ user.cpp:29:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d%d%d%d" ,&n,&m,&l1,&c1,&l2,&c2); ^ user.cpp:32:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&mat[i][j]); ^