Compilare: user.cpp: In function ‘int main()’: user.cpp:192:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (t<=s1) ^ user.cpp:206:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (t<=s2) ^ user.cpp:220:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (t<=s3) ^ user.cpp:234:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (t<=s4) ^