Compilare: main.cpp: In function 'int main()': main.cpp:15:31: 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:16:33: 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:19:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&n,&m); ^ main.cpp:65:17: warning: 'jj' may be used uninitialized in this function [-Wmaybe-uninitialized] q[first].col=jj; ~~~~~~~~~~~~^~~ main.cpp:64:17: warning: 'ji' may be used uninitialized in this function [-Wmaybe-uninitialized] q[first].lin=ji; ~~~~~~~~~~~~^~~ main.cpp:50:17: warning: 'rj' may be used uninitialized in this function [-Wmaybe-uninitialized] q[first].col=rj; ~~~~~~~~~~~~^~~ main.cpp:49:17: warning: 'ri' may be used uninitialized in this function [-Wmaybe-uninitialized] q[first].lin=ri; ~~~~~~~~~~~~^~~