Compilare: main.cpp: In function 'bool cmp(std::pair<int, int>, std::pair<int, int>)': main.cpp:36:52: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return A.right < B.right || A.right == B.right && A.left > B.left; ^ main.cpp: In function 'char nextch()': main.cpp:15:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^