Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:26:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vi[nod].size(); i++) ^ user.cpp:37:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<vi[X].size(); j++) ^ user.cpp: In function ‘void bellmanford()’: user.cpp:67:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[nod].size(); i++) ^ user.cpp: In function ‘bool dijkstra()’: user.cpp:94:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:143:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vi[X].size(); i++) ^ user.cpp:163:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vi[X].size(); i++) ^ user.cpp:130:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&ni,&m,&u,&X); ^ user.cpp:132:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&un[i]); ^ user.cpp:136:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&A,&B); ^