Compilare: user.cpp: In function ‘bool leq(int, int, int, int)’: user.cpp:39:32: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return(a1 < b1 || a1 == b1 && a2 <= b2); ^ user.cpp: In function ‘bool leq(int, int, int, int, int, int)’: user.cpp:44:32: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return(a1 < b1 || a1 == b1 && leq(a2,a3, b2,b3)); ^ user.cpp: In function ‘int main()’: user.cpp:238:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets (S, sizeof(S), f); ^