Compilare: user.cpp: In function ‘int main()’: user.cpp:78:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i< v[1].v.size(); i++) ^ user.cpp:92:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i< v[arc.destinatie].v.size(); i++) ^ user.cpp:59:12: warning: unused variable ‘j’ [-Wunused-variable] { int i, j, a, b, c; ^ user.cpp:61:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in","r",stdin); ^ user.cpp:62:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdout); ^ user.cpp:63:37: 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,buff_size, stdin); ^ user.cpp: In function ‘void read(int&)’: user.cpp:12:96: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(!isdigit(buff[pos])) if(++pos == buff_size) fread(buff, 1,buff_size, stdin), pos = 0; ^ user.cpp:17:73: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos == buff_size) fread(buff, 1, buff_size, stdin), pos = 0; ^