Compilare: user.cpp: In function ‘int find(int, int)’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ((pos < adj[v].size()) && (adj[v][pos].len != len)) { ^ user.cpp: In function ‘void add(int, int, int)’: user.cpp:34:38: warning: narrowing conversion of ‘len’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] adj[v].push_back((list){len, freq}); ^ user.cpp:38:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos != adj[v].size()) { ^ user.cpp:49:38: warning: narrowing conversion of ‘len’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] adj[v].push_back((list){len, freq}); ^ user.cpp: In function ‘int main()’: user.cpp:93:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (pos = 0; pos < adj[j].size(); pos++) { ^ user.cpp:103:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (pos = 0; pos < adj[i].size(); pos++) { ^ user.cpp:77:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &N); ^ user.cpp:79:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &val[i]); ^ user.cpp:108:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bilute2.out", "w", stdout); ^