Compilare: user.cpp: In function ‘int main()’: user.cpp:28:14: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] s1[1 - a & 1].insert(0); ^ user.cpp:30:27: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] for(it = s1[1 - i & 1].begin(); it != s1[1 - i & 1].end(); it++) { ^ user.cpp:30:56: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] for(it = s1[1 - i & 1].begin(); it != s1[1 - i & 1].end(); it++) { ^ user.cpp:34:18: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] s1[1 - i & 1].clear(); ^ user.cpp:36:14: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] s2[1 - (med + 1) & 1].insert(0); ^ user.cpp:38:27: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] for(it = s2[1 - i & 1].begin(); it != s2[1 - i & 1].end(); it++) { ^ user.cpp:38:56: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] for(it = s2[1 - i & 1].begin(); it != s2[1 - i & 1].end(); it++) { ^ user.cpp:42:18: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] s2[1 - i & 1].clear(); ^ user.cpp:16:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&q); ^ user.cpp:18:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&v[i]); ^ user.cpp:26:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&a,&b); ^