Compilare: main.cpp: In function 'void RMQ_build()': main.cpp:83:20: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] k = 1 << i - 1; ~~^~~ main.cpp: In function 'int main()': main.cpp:99:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("pirati.in", "r", stdin); ^ main.cpp:100:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("pirati.out", "w", stdout); ^ main.cpp:102:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d", &N, &M, &_Q); ^ main.cpp:104:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%s", S + 1); ^ main.cpp:131:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d", &i, &j, &_i, &_j); ^