Compilare: main.cpp: In function 'int main()': main.cpp:139:20: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[400042]' [-Wformat=] scanf("%s",&str); ^ In file included from /usr/include/c++/6/cassert:44:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:33, from main.cpp:2: main.cpp:187:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(inv_array[i]<where.size()); ~~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:133:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("frequent.in","r",stdin); ^ main.cpp:134:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("frequent.out","w",stdout); ^ main.cpp:136:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%i",&k); ^ main.cpp:139:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&str); ^