Compilare: main.cpp: In function 'int ok(int)': main.cpp:13:15: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'int' [-Wsign-compare] 13 | for(i=1; i<=k; i++) | ~^~~ main.cpp: In function 'void back(int)': main.cpp:38:23: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'int' [-Wsign-compare] 38 | for(j=1; j<=k; j++) | ~^~~ main.cpp:43:27: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 43 | else if(o==0 and k<m) | ~^~