Compilare: main.cpp: In function 'int main()': main.cpp:31:90: warning: format '%d' expects argument of type 'int', but argument 2 has type '__gnu_cxx::__normal_iterator<int*, std::vector<int> >::difference_type {aka long int}' [-Wformat=] printf("%d\n", std::lower_bound(pos[x].begin(), pos[x].end(), num) - pos[x].begin()); ^ main.cpp:7:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("undo2.in", "r", stdin); ^ main.cpp:8:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("undo2.out", "w", stdout); ^ main.cpp:11:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &nrOp); ^ main.cpp:17:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &type, &x); ^