Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:27:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &nrvar, &n); ^ user.cpp:44:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&nr); ^ user.cpp:48:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d",&m); ^ user.cpp:52:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &V[i]); ^ user.cpp:37:20: warning: iteration 620u invokes undefined behavior [-Waggressive-loop-optimizations] aparitii[i][j]=0; ^ user.cpp:35:3: note: containing loop for(j=0;j<M;j++) ^