Compilare: user.cpp: In function ‘int main()’: user.cpp:20:18: warning: unused variable ‘i’ [-Wunused-variable] int n, m, c, i, l, r; ^ user.cpp:20:21: warning: unused variable ‘l’ [-Wunused-variable] int n, m, c, i, l, r; ^ user.cpp:20:24: warning: unused variable ‘r’ [-Wunused-variable] int n, m, c, i, l, r; ^ user.cpp:21:15: warning: unused variable ‘ans’ [-Wunused-variable] long long ans = 1; ^ user.cpp:17:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vagoane.in", "r", stdin); ^ user.cpp:18:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vagoane.out", "w", stdout); ^ user.cpp:23:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &c); ^