Compilare: main.cpp: In function 'void euler(int, int)': main.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[i_next][j_next].size(); i++) ~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:85:14: warning: array subscript is above array bounds [-Warray-bounds] sol[nr][2]=jj; ~~~~~~~~~^ main.cpp: In function 'int main()': main.cpp:154:41: warning: array subscript is above array bounds [-Warray-bounds] fo<<sol[i][1]<<" "<<sol[i][2]<<endl; ^