Compilare: main.cpp: In function 'int main()': main.cpp:52:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&cer,&n,&st,&dr); ^ main.cpp:55:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&a[i][j]); ^ main.cpp: In function 'void form(int)': main.cpp:28:37: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] if (poz!=1 && d[i][poz].first==d[i][poz-1].first){ ~~~~~~~~~~^~~~~