Compilare: main.cpp: In function 'int main()': main.cpp:21:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nivel[nr-1].size();i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<nivel[i].size();j++) ~^~~~~~~~~~~~~~~~ main.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<g[nivel[i][j]].size();k++) ~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void sorttop()': main.cpp:70:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nivel[nr].size();i++) ~^~~~~~~~~~~~~~~~~ main.cpp:71:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[nivel[nr][i]].size();j++) ~^~~~~~~~~~~~~~~~~~~~~~~