Compilare: user.cpp: In function ‘bool cmp(oaie, oaie)’: user.cpp:18:53: warning: operation on ‘y.oaie::cant’ may be undefined [-Wsequence-point] x.cant = x.cant + y.cant - (y.cant = x.cant); ^ user.cpp:19:53: warning: operation on ‘y.oaie::dist’ may be undefined [-Wsequence-point] x.dist = x.dist + y.dist - (y.dist = x.dist); ^ user.cpp: In function ‘void addheap(int)’: user.cpp:35:74: warning: operation on ‘heap[tata]’ may be undefined [-Wsequence-point] heap[fiu] = heap[fiu] + heap[tata] - (heap[tata] = heap[fiu]); ^ user.cpp: In function ‘int extractmax()’: user.cpp:57:74: warning: operation on ‘heap[tata]’ may be undefined [-Wsequence-point] heap[fiu] = heap[fiu] + heap[tata] - (heap[tata] = heap[fiu]); ^ user.cpp: In function ‘int main()’: user.cpp:69:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.in", "r", stdin); ^ user.cpp:72:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n", &n, &x, &l); ^ user.cpp:74:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a[i].dist, &a[i].cant); ^ user.cpp:80:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.out", "w", stdout); ^