Compilare: user.cpp: In function ‘int main()’: user.cpp:70:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &row, &column); ^ user.cpp: In function ‘char nextch()’: user.cpp:12:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^ user.cpp: In function ‘int main()’: user.cpp:146:30: warning: ‘o2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(dfs(i1, i2, o1, o2, dr)) ^ user.cpp:146:30: warning: ‘o1’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:146:30: warning: ‘i2’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:146:30: warning: ‘i1’ may be used uninitialized in this function [-Wmaybe-uninitialized]