Compilare: user.cpp: In function ‘bool cmp(std::pair<int, int>, std::pair<int, int>)’: user.cpp:38:53: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return (a.first < b.first || a.first == b.first && a.second > b.second); ^ user.cpp: In function ‘int main()’: user.cpp:49:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &K); ^ user.cpp:50:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", ch); ^