Compilare: user.cpp: In function ‘int main()’: user.cpp:50:21: warning: unused variable ‘k’ [-Wunused-variable] int N, M, i, j, k, last; ^ user.cpp:51:30: warning: unused variable ‘aux’ [-Wunused-variable] long double a[301][302], aux, sol[302], sum = 0; ^ user.cpp:52:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d%d", &N, &M); ^ user.cpp:55:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%Lf", &a[i][j]); ^ user.cpp:50:18: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] int N, M, i, j, k, last; ^