Compilare: main.cpp: In function 'int main()': main.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ~^~ main.cpp:15:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<n;++j) ~^~ main.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<n;++k) ~^~ main.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ~^~ main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<n;++j) ~^~ main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ~^~ main.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<n;++j) ~^~ main.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ~^~ main.cpp:38:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<n;++j) ~^~