Compilare: user.cpp: In function ‘int main()’: user.cpp:38:32: warning: format ‘%llu’ expects argument of type ‘long long unsigned int*’, but argument 3 has type ‘ull* {aka int*}’ [-Wformat=] fscanf(iff,"%llu",&mat[i][j]); ^ user.cpp:46:31: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘ull {aka int}’ [-Wformat=] fprintf(off,"%llu ",d[i][j]); ^ user.cpp:34:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(iff,"%d",&N); ^ user.cpp:38:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(iff,"%llu",&mat[i][j]); ^