Compilare: user.cpp: In function ‘int main()’: user.cpp:40:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d\n", &n, &m); ^ user.cpp:43:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c", &mat[i][j]); ^ user.cpp:52:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "\n"); ^ user.cpp:56:21: warning: ‘jc’ may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(jl, jc, jul); ^ user.cpp:56:21: warning: ‘jl’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:55:21: warning: ‘rc’ may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(rl, rc, rom); ^ user.cpp:55:21: warning: ‘rl’ may be used uninitialized in this function [-Wmaybe-uninitialized]