Compilare: main.cpp: In function 'void block_nodes()': main.cpp:21:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < arma[ arr[i] ].size(); j++ ) ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < arma[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:66:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < cnt[vec].size(); j++ ){ ~~^~~~~~~~~~~~~~~~~ main.cpp:74:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < edge[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:102:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < edge[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:111:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < op.size(); i++ ) ~~^~~~~~~~~~~