Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:29:7: warning: unused variable ‘cost’ [-Wunused-variable] int cost, s; ^ user.cpp:29:13: warning: unused variable ‘s’ [-Wunused-variable] int cost, s; ^ user.cpp: In function ‘int main()’: user.cpp:54:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:55:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &li, &ci, &lf, &cf); ^ user.cpp:58:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i][j]); ^ user.cpp: In function ‘void dfs(int, int, int, int)’: user.cpp:18:7: warning: ‘nr’ is used uninitialized in this function [-Wuninitialized] nr++; ^