Compilare: user.cpp: In function ‘bool p(int, int)’: user.cpp:106:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(x!=q) ^ user.cpp:110:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(y!=q) ^ user.cpp: In function ‘int main()’: user.cpp:136:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[val[i]].push_back(i); ^ user.cpp:140:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int ii=0; ii< f[k].size(); ++ii) ^ user.cpp:140:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ii=0; ii< f[k].size(); ++ii) ^ user.cpp:141:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int jj=ii+1; jj< f[k].size(); ++jj){ ^ user.cpp:141:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int jj=ii+1; jj< f[k].size(); ++jj){ ^ user.cpp:143:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] int i = f[k][ii]; ^ user.cpp:144:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] int j = f[k][jj]; ^ user.cpp:119:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.in","r",stdin); ^ user.cpp:120:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.out","w",stdout); ^ user.cpp:122:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:126:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&x,&y); ^ user.cpp:135:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c ",&val[i]); ^