Compilare: main.cpp: In function 'int main()': main.cpp:25:30: warning: unused variable 'INF' [-Wunused-variable] long long sz = 0, ans = 0, INF = 2e9; ^~~ main.cpp:6:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("petreceri.in", "r", stdin); ^ main.cpp:7:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("petreceri.out", "w", stdout); ^ main.cpp: In function 'main()::<lambda()>': main.cpp:11:20: warning: 'c' is used uninitialized in this function [-Wuninitialized] for (; !isdigit(c); c = getchar()); ~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:11:20: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized] for (; !isdigit(c); c = getchar()); ~~~~~~~^~~ main.cpp:11:20: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized] for (; !isdigit(c); c = getchar()); ~~~~~~~^~~