Compilare: user.cpp: In function ‘int make_dp(int, int)’: user.cpp:61:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<PCT[now].size();++i) dp[0][i]=inf; ^ user.cpp:66:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<PCT[now].size();++i) dp[stp][i]=inf; ^ user.cpp:67:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<PCT[now].size();++i) ^ user.cpp:68:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<PCT[ant].size();++j) ^ user.cpp:74:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<PCT[ant].size();++j) ^ user.cpp: In function ‘int main()’: user.cpp:94:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<PCT[pstart].size();++i) ^