Compilare: user.cpp: In function ‘void doPrice()’: user.cpp:29:15: warning: unused variable ‘x’ [-Wunused-variable] int i, j, x, left, right; ^ user.cpp: In function ‘int main()’: user.cpp:78:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k<Q[i].size(); ++k) ^ user.cpp:45:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("car.in", "r", stdin); ^ user.cpp:46:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("car.out", "w", stdout); ^ user.cpp:50:68: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d", &n, &m, &startx, &starty, &stopx, &stopy); ^ user.cpp:56:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^