Compilare: main.cpp: In function 'void erat()': main.cpp:10:18: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations] if(ciur[i]==0) ~~~~~~^ main.cpp:9:19: note: within this loop for(int i=2; i<=N; i++) ~^~~ main.cpp: In function 'void form()': main.cpp:21:22: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations] if(v[i][j]==0) v[i][j]=v[i][j-1]; ~~~~~~^ main.cpp:20:23: note: within this loop for(int j=2; j<=N; j++) ~^~~ main.cpp:18:17: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations] v[ciur[i]][i]=i; ~~~~~~^ main.cpp:17:19: note: within this loop for(int i=2; i<=N; i++) ~^~~