Compilare: main.cpp: In function 'int main()': main.cpp:67:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(fin,"r",stdin); ^ main.cpp:69:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(fout,"w",stdout); ^ main.cpp:72:27: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(buff,Nmax,stdin); ^ main.cpp:77:27: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(buff,Nmax,stdin); ^ main.cpp:119:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(fin,"r",stdin); ^ main.cpp:121:27: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(buff,Nmax,stdin); ^ main.cpp: In function 'void go(int)': main.cpp:59:22: warning: iteration 3 invokes undefined behavior [-Waggressive-loop-optimizations] go(pozt[ord[i]]); ~~~~~^ main.cpp:58:15: note: within this loop for (i=1;i<5;++i) ~^~ main.cpp: In function 'int main()': main.cpp:116:28: warning: array subscript is above array bounds [-Warray-bounds] ord[3]=tab[2][1]; ord[4]=tab[2][2]; ~~~~~^