Compilare: main.cpp: In function 'void gen_stacks()': main.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < blocks.size() && crt; j++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:51:31: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", blocks.size()); ^ main.cpp:52:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < blocks.size(); i++) { ~~^~~~~~~~~~~~~~~ main.cpp:53:35: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d ", stacks[i].size()); ^ main.cpp:43:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stive.in", "r", stdin); ^ main.cpp:44:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stive.out", "w", stdout); ^ main.cpp:46:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^