Compilare: main.cpp: In function 'int exist(unsigned int)': main.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i< l ;i++) ~^~~ main.cpp: In function 'int main()': main.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0 ; i < X ; i++) ~~^~~ main.cpp:40:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i= 0 ; i < X ; i ++ ) ~~^~~ main.cpp:43:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i <= l-X ; i++ ) ~~^~~~~~ main.cpp:37:16: warning: iteration 29 invokes undefined behavior [-Waggressive-loop-optimizations] pow3[i]=pow3[i-1]*3; ~~~~~~~^~~~~~~~~~~~ main.cpp:36:20: note: within this loop for (int i=1; i<= 30 ;i++) ~^~~~~