Compilare: main.cpp: In function 'int main()': main.cpp:11:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rj.in","r",stdin); ^ main.cpp:12:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rj.out","w",stdout); ^ main.cpp:60:14: warning: 'yJ' may be used uninitialized in this function [-Wmaybe-uninitialized] a2[xJ][yJ]=1; ~~~~~~~~~^ main.cpp:60:14: warning: 'xJ' may be used uninitialized in this function [-Wmaybe-uninitialized] main.cpp:42:13: warning: 'yR' may be used uninitialized in this function [-Wmaybe-uninitialized] a[xR][yR]=1; ~~~~~~~~^ main.cpp:42:13: warning: 'xR' may be used uninitialized in this function [-Wmaybe-uninitialized]