Compilare: main.cpp: In function 'int main()': main.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ~^~~ main.cpp:30:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!ok&&s[k]+1<=n) ~~~~~~^~~ main.cpp:36:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==n) ~^~~ main.cpp:39:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<n;i++){ ~^~ main.cpp:40:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<=n;j++){ ~^~~ main.cpp:44:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(grad==grd){ ~~~~^~~~~ main.cpp:45:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ~^~~