Compilare: main.cpp: In function 'int32_t main()': main.cpp:49:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < 25 && (level == -1); ++i) ~~~~~~^~~~~ main.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(level == -1) { ~~~~~~^~~~~ main.cpp:57:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st <= dr && (ans == -1)) { ~~~~^~~~~ main.cpp:68:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans == -1) { ~~~~^~~~~