Compilare: user.cpp: In function ‘int main()’: user.cpp:38:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &t); ^ user.cpp:45:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &Qu[z].n, &Qu[z].k); ^ user.cpp:47:65: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= Qu[z].n; i++) fscanf(fi,"%d", &v[i]); ^ user.cpp:104:28: warning: ‘Sprev’ may be used uninitialized in this function [-Wmaybe-uninitialized] S += Sprev * (Q[ind][n * (n - 1) / 2] - Q[ind][std::max(0, (int)sprev + i - 1)]); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:112:53: warning: ‘S’ may be used uninitialized in this function [-Wmaybe-uninitialized] else ans[Qu[z].ind] = sprev, ANS[Qu[z].ind] = S; ~~~~~~~~~~~~~~~^~~