Compilare: user.cpp: In function ‘int main()’: user.cpp:28:15: warning: unused variable ‘t’ [-Wunused-variable] long long n, t, i, j, k; ^ user.cpp:38:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i][j]); ^ user.cpp:36:3: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (j = 1; j <= n; ++j) { ^