Compilare: main.cpp: In function 'void rec(int)': main.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=n;i++){ ~^~~ main.cpp:14:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k[i][col]>=nr){ main.cpp: In function 'int main()': main.cpp:40:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n+1;i++){ ~^~~~~ main.cpp:45:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++){ ~^~~ main.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++){ ~^~~