Compilare: main.cpp: In function 'int main()': main.cpp:102:78: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] rmq[k][i][j] = max (max (rmq[k - 1][i][j], rmq[k - 1][i][j + (1 << k - 1)]), ~~^~~ main.cpp:103:57: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] max (rmq[k - 1][i + (1 << k - 1)][j], rmq[k - 1][i + (1 << k - 1)][j + (1 << k - 1)])); ~~^~~ main.cpp:103:90: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] max (rmq[k - 1][i + (1 << k - 1)][j], rmq[k - 1][i + (1 << k - 1)][j + (1 << k - 1)])); ~~^~~ main.cpp:103:108: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] max (rmq[k - 1][i + (1 << k - 1)][j], rmq[k - 1][i + (1 << k - 1)][j + (1 << k - 1)])); ~~^~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:15:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^