Compilare: user.cpp: In function ‘long int cb(long int, long int)’: user.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == dp[s].size()) return 100000; ^ user.cpp: In function ‘int main()’: user.cpp:91:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<act.size();j++){ ^ user.cpp:67:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("div.in","r",stdin); ^ user.cpp:68:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("div.out","w",stdout); ^ user.cpp:70:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld\n%s",&n,m+1); ^