Compilare: user.cpp: In function ‘int main()’: user.cpp:94:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cri.in", "r", stdin); ^ user.cpp:95:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cri.out", "w", stdout); ^ user.cpp:97:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &N, &M, &x, &y); ^ user.cpp:101:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cost[i][j]); ^ user.cpp: In function ‘int firstZone(int&)’: user.cpp:24:14: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((a & 1) | (b & 1)) ^ user.cpp: In function ‘int secondZone(int&)’: user.cpp:45:14: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((a & 1) | (b & 1)) ^ user.cpp: In function ‘int thirdZone(int&)’: user.cpp:65:14: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((a & 1) | (b & 1)) ^ user.cpp: In function ‘int fourthZone(int&)’: user.cpp:73:10: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] int a, b; ^