Compilare: user.cpp: In function ‘void doPrice()’: user.cpp:36:15: warning: unused variable ‘x’ [-Wunused-variable] int i, j, x, left, right; ^ user.cpp: In function ‘int main()’: user.cpp:89:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k<Q[i].size(); ++k) ^ user.cpp:55:9: warning: unused variable ‘a’ [-Wunused-variable] int a, ans, k, x, i, j, startx, starty, stopx, stopy, price; ^ user.cpp: In function ‘char getChar()’: user.cpp:126:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos = 0, fread(buf, 1, BUF, fin); ^