Compilare: main.cpp: In function 'int main()': main.cpp:46:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dupadealuri.in", "r", stdin); ^ main.cpp:47:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dupadealuri.out", "w", stdout); ^ main.cpp:49:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s + 1); ^ main.cpp:52:15: warning: iteration 100004 invokes undefined behavior [-Waggressive-loop-optimizations] v[i] = s[i] - 'a' + 1; ~~~^ main.cpp:51:21: note: within this loop for (int i = 1; i <= MAXN; ++i) ~~^~~~~~~