Compilare: main.cpp: In function 'int main()': main.cpp:31:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(v[i][p1].first<val && p1+1<v[i].size()) ~~~~^~~~~~~~~~~~ main.cpp:33:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(v[j][p2].first<val && p2+1<v[j].size()) ~~~~^~~~~~~~~~~~ main.cpp:35:47: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(v[i][p1].first>val && v[j][p2].first>val || val>1000000)