Compilare: main.cpp: In function 'int main()': main.cpp:12:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "snake.in", "r", stdin ); ^ main.cpp:13:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "snake.out", "w", stdout ); ^ main.cpp:17:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%d", &n, &m, &l ); ^ main.cpp:20:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &V[ i ][ j ] ); ^ main.cpp:32:18: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] x_aa = x_a[ i ] + x; ~~~~~^~~~~~~~~~~~~~ main.cpp:41:40: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] if ( V[ x ][ y ] + 2 == V[ x_aaa ][ y_aaa ] ) { ~~~~~~~~~~^