Compilare: main.cpp: In function 'int main()': main.cpp:127:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("jolteon.in", "r", stdin); ^ main.cpp:128:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("jolteon.out", "w", stdout); ^ main.cpp:130:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:131:52: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= n ; ++i) scanf("%d", &a[i]); ^ main.cpp: In function 'long long int solve(int, int)': main.cpp:112:13: warning: 'par' may be used uninitialized in this function [-Wmaybe-uninitialized] if(par == 0) update(j + 1, now, 1); ^~