Compilare: user.cpp:2:16: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define MAXC 1 << 14 ^ user.cpp:9:31: note: in expansion of macro ‘MAXC’ std::pair <int, int> from[1 + MAXC]; ^ user.cpp: In function ‘int main()’: user.cpp:62:73: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] mask ^= (1 << (from[mask].first - 1)) + (1 << from[mask].second - 1); ^ user.cpp:18:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &D); ^ user.cpp:20:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &v[i].x, &v[i].y); ^