Compilare: main.cpp: In function 'int main()': main.cpp:64:17: warning: unused variable 'val' [-Wunused-variable] int val = l[i].top(); ^~~ main.cpp:72:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<moves>::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", sol.size()); ^ main.cpp:21:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("triaj.in", "r", stdin); ^ main.cpp:22:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("triaj.out", "w", stdout); ^ main.cpp:24:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:27:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^