Compilare: main.cpp: In function 'int main()': main.cpp:46:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < Pab.size(); ++i)Pab[i] += Pab[i-1]; ~~^~~~~~~~~~~~ main.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < Pa.size(); ++i)Pa[i] += Pa[i-1]; ~~^~~~~~~~~~~ main.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < Pb.size(); ++i)Pb[i] += Pb[i-1]; ~~^~~~~~~~~~~ main.cpp:49:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < Pn.size(); ++i)Pn[i] += Pn[i-1]; ~~^~~~~~~~~~~ main.cpp:52:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int sh = 0; sh < Pab.size(); ++sh) ~~~^~~~~~~~~~~~