Compilare: user.cpp: In function ‘void roy_floyd(std::vector<std::vector<int> >&)’: user.cpp:85:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<d.size();k++) ^ user.cpp:86:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<d.size();i++) ^ user.cpp:87:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<d.size();j++) ^ user.cpp: In function ‘void precalc()’: user.cpp:118:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<comp.size();i++) ^ user.cpp: In function ‘void update_edge(int, int, int)’: user.cpp:148:9: warning: unused variable ‘a’ [-Wunused-variable] int a=comp[c].poz[x],b=comp[c].poz[y]; ^ user.cpp:148:26: warning: unused variable ‘b’ [-Wunused-variable] int a=comp[c].poz[x],b=comp[c].poz[y]; ^ user.cpp: In function ‘int main()’: user.cpp:314:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(lognr=1;(1<<lognr)<=n+comp.size();lognr++);lognr--; ^ user.cpp:318:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<op.size();i++) ^ user.cpp:250:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ostrov.out", "w", stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:199:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^