Compilare: main.cpp: In function 'int main()': main.cpp:57:46: warning: format '%d' expects argument of type 'int', but argument 4 has type 'std::stack<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d %d %d ", i, 1, r[i].size()); ^ main.cpp:78:46: warning: format '%d' expects argument of type 'int', but argument 4 has type 'std::stack<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d %d %d ", i, 0, l[i].size()); ^ main.cpp:80:17: warning: unused variable 'val' [-Wunused-variable] int val = l[i].top(); ^~~ main.cpp:22:36: 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:23:38: 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:25:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:28:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^