Compilare: main.cpp: In function 'int main()': main.cpp:45:21: warning: unused variable 'j' [-Wunused-variable] int n, u, v, i, j, start, nr; ^ main.cpp:43:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("domino.in", "r", stdin); ^ main.cpp:44:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("domino.out", "w", stdout); ^ main.cpp:46:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:49:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^ main.cpp:83:21: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] euler(start); ^