Compilare: main.cpp: In function 'int main()': main.cpp:20:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &t); ^ main.cpp:23:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &m); ^ main.cpp:27:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d", &x, &y, &c); ^ main.cpp:64:26: warning: 'node' may be used uninitialized in this function [-Wmaybe-uninitialized] }while(a != node || b != from); ~~~~~~~~~~^~~~~~~~~~~~