Compilare: user.cpp: In function ‘int solve()’: user.cpp:39:37: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if (a[l][c]&(1<<(i-1))==0 && (a[lc][cc]&(1<<(coresp[i])))==0) ^ user.cpp:39:18: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (a[l][c]&(1<<(i-1))==0 && (a[lc][cc]&(1<<(coresp[i])))==0) ^ user.cpp: In function ‘int main()’: user.cpp:52:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("verlab.in","r",stdin); ^ user.cpp:53:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("verlab.out","w",stdout); ^ user.cpp:55:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp: In function ‘int solve()’: user.cpp:19:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:22:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^