Compilare: user.cpp: In function ‘int main()’: user.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<=c[1].size();++i) ^ user.cpp:32:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=c[1].size()+1;i<=c[1].size()+c[2].size();++i) ^ user.cpp:76:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=c[1].size()+1;i<=c[1].size()+c[2].size();++i) ^ user.cpp:87:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (printf("%d\n",sol.size()),i=0;i<sol.size();++i) ^ user.cpp:17:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("egipt.in","r",stdin); ^ user.cpp:18:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("egipt.out","w",stdout); ^ user.cpp:20:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:24:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&p[i]); ^