Compilare: main.cpp: In function 'int main()': main.cpp:286:21: warning: iteration 19 invokes undefined behavior [-Waggressive-loop-optimizations] 286 | a[i][j] = 1e9; | ~~~~~~~~^~~~~ main.cpp:285:27: note: within this loop 285 | for (int j = 1; j <= 20; j++) | ~~^~~~~ main.cpp:286:21: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations] 286 | a[i][j] = 1e9; | ~~~~~~~~^~~~~ main.cpp:284:23: note: within this loop 284 | for (int i = 1; i <= 1e9; i++) | ~~^~~~~~