Compilare: user.cpp: In function ‘void test()’: user.cpp:9:17: warning: unused variable ‘k’ [-Wunused-variable] int s=0,j,i,k,sum; ^ user.cpp: In function ‘int main()’: user.cpp:55:9: warning: unused variable ‘r’ [-Wunused-variable] int r=1, s, k; ^ user.cpp:55:14: warning: unused variable ‘s’ [-Wunused-variable] int r=1, s, k; ^ user.cpp:55:17: warning: unused variable ‘k’ [-Wunused-variable] int r=1, s, k; ^ user.cpp:44:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ user.cpp:49:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] { fscanf(fin,"%d",&a[i][j]); ^