Compilare: user.cpp: In function ‘int main()’: user.cpp:57:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int o=0;o<mat[ndfin].size();o++) ^ user.cpp:67:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<cost[ndfin].size();k++) ^ user.cpp:56:13: warning: unused variable ‘mt’ [-Wunused-variable] int mt=c; ^ user.cpp:93:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<cost[i].size();j++) ^ user.cpp:104:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k>=cost[x].size()) ^