Compilare: main.cpp: In function 'void solve(int)': main.cpp:61:7: warning: variable 'lastLeft' set but not used [-Wunused-but-set-variable] int lastLeft, lastRight; ^~~~~~~~ main.cpp: In function 'int main()': main.cpp:87:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rangemode.in", "r", stdin); ^ main.cpp:88:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rangemode.out", "w", stdout); ^ main.cpp:91:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:93:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ main.cpp:96:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &left, &right); ^