Compilare: user.cpp: In function ‘void dijkstra(int, int)’: user.cpp:69:35: warning: variable ‘piter’ set but not used [-Wunused-but-set-variable] int top, len, pta, ptb, buff, piter; ^ user.cpp: In function ‘char nextch()’: user.cpp:32:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buck, 1, BMAX, stdin); } ^ user.cpp: In function ‘int main()’: user.cpp:136:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nolife.in", "r", stdin); ^ user.cpp:137:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nolife.out", "w", stdout); ^ user.cpp: In function ‘void dijkstra(int, int)’: user.cpp:124:9: warning: ‘ptb’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j = ptb; j != -1; j = far[j]) ant[ buff++ ] = j; ^ user.cpp:126:9: warning: ‘pta’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j = pta; j != -1; j = far[j]) ant[ buff++ ] = j; ^