Compilare: main.cpp: In function 'int main()': main.cpp:235:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &_); ^ main.cpp:238:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ main.cpp: In function 'void solve(int)': main.cpp:101:91: warning: 'xRight' may be used uninitialized in this function [-Wmaybe-uninitialized] dp[n][3].len=bestLeft+bestRight+1, dp[n][3].left=xLeft, dp[n][3].right=xRight, dp[n][3].setOp((char)opLeft, (char)opRight); ~~~~~~~~~~~~~~^~~~~~~ main.cpp:101:69: warning: 'xLeft' may be used uninitialized in this function [-Wmaybe-uninitialized] dp[n][3].len=bestLeft+bestRight+1, dp[n][3].left=xLeft, dp[n][3].right=xRight, dp[n][3].setOp((char)opLeft, (char)opRight); ~~~~~~~~~~~~~^~~~~~ main.cpp:101:114: warning: 'opRight' may be used uninitialized in this function [-Wmaybe-uninitialized] dp[n][3].len=bestLeft+bestRight+1, dp[n][3].left=xLeft, dp[n][3].right=xRight, dp[n][3].setOp((char)opLeft, (char)opRight); ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:101:114: warning: 'opLeft' may be used uninitialized in this function [-Wmaybe-uninitialized]