Compilare: main.cpp: In function 'int main()': main.cpp:13:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.in", "r", stdin); ^ main.cpp:14:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.out", "w", stdout); ^ main.cpp:16:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:19:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &matrix[i][j]); ^ main.cpp:39:36: warning: 'j_cur' may be used uninitialized in this function [-Wmaybe-uninitialized] if(i != i_cur || j != j_cur){ ~~^~~~~~~~ main.cpp:30:9: warning: 'i_cur' may be used uninitialized in this function [-Wmaybe-uninitialized] int i_cur = 1, j_cur = 1; ^~~~~