Compilare: user.cpp: In function ‘void drum(int, int, int)’: user.cpp:14:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] { if(k) if(aux[x-pas[k]][y]>aux[x][y-pas[k]]) drum(x-pas[k],y,k-1); ^ user.cpp: In function ‘int main()’: user.cpp:33:14: warning: statement has no effect [-Wunused-value] for(i; i<n&&s-i>=0; ++i) ^ user.cpp:22:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,20000, stdin); ^ user.cpp: In function ‘void read(short int&)’: user.cpp:8:103: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { while(buff[pos] < '0' || buff[pos] > '9') if(++pos == 20000) fread(buff, 1, 20000, stdin), pos = 0; ^ user.cpp:10:137: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while('0' <= buff[pos] && buff[pos] <= '9') {nr = nr * 10 + buff[pos] - '0';if(++pos == 20000) fread(buff, 1, 20000, stdin), pos = 0;} ^