Compilare: main.cpp: In function 'void precalc()': main.cpp:25:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long j=0; j<d[i].size(); j++) ~^~~~~~~~~~~~ main.cpp: In function 'void dfs(long long int)': main.cpp:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i=0; i<nod[x].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:46:39: warning: operation on 'M[x][var]' may be undefined [-Wsequence-point] M[x][var] = M[x][var]++; ~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:55:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i=0; i<fii.size(); i++) ~^~~~~~~~~~~ main.cpp:51:15: warning: unused variable 'val' [-Wunused-variable] long long val = 1; ^~~