Compilare: main.cpp: In function 'int main()': main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<2*chain[i].size();j++) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:72:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[k].size();i++) ~^~~~~~~~~~~~ main.cpp:86:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[k].size();i++) ~^~~~~~~~~~~~ main.cpp:93:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[k].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void update(int, int, int, int, int, int)': main.cpp:120:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation] else ^~~~ main.cpp:122:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else' if(level[ a[ch][2*nod] ] < level[ a[ch][2*nod+1] ]) ^~