Compilare: main.cpp: In function 'int main()': main.cpp:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i1 = 0; i1 < v.size(); i1++ ){ ~~~^~~~~~~~~~ main.cpp:37:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i2 = i1+1; i2 < v.size(); i2++ ){ ~~~^~~~~~~~~~ main.cpp:38:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i3 = i2+1; i3 < v.size(); i3++ ){ ~~~^~~~~~~~~~ main.cpp:39:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i4 = i3+1; i4 < v.size(); i4++ ){ ~~~^~~~~~~~~~ main.cpp:40:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i5 = i4+1; i5 < v.size(); i5++ ){ ~~~^~~~~~~~~~